Java Test 7 - 2024

A free Java certification Practice test for Java SE 17: 1Z0-829 Test 7 is an excellent foundation for anyone starting their programming journey. It validates your knowledge of Java basics such as object-oriented programming, exception handling, and collections. Certifications show recruiters that you’ve taken the time to learn and prove your skills. However, foundations alone don’t build careers.

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Welcome to your Java Test - 7 - 2024

Name

Email

Phone

Q1. What will be printed when the following code is compiled and run?

class A {
public int getCode(){ return 2;}
}

class AA extends A {
public long getCode(){ return 3;}
}

public class TestClass {

public static void main(String[] args) throws Exception {
A a = new A();
A aa = new AA();
System.out.println(a.getCode()+" "+aa.getCode());
}

public int getCode() {
return 1;
}
}

You had to select 1 option(s)

2 3

2 2

It will throw an exception at run time.

The code will not compile.

None

Q2. What will the following expression return?

"""
hello java \
guru
""".strip();

You had to select 1 option(s)

The line of code will not compile.

hellojavaguru"

"hello java guru"

"hello java guru "

None of the above

None

Q3. What will be the output of the following program?

class Data{
public volatile int d1 = 0;
public AtomicInteger d2 = new AtomicInteger(0);

}
public class TestClass
{

public static void main(String args[]) throws Exception
{
Data data = new Data();
Runnable r1 = () -> {
Thread t1 = Thread.currentThread();
for(;data.d1<2;){
System.out.print(t1.getName()+" : "+data.d1+" ");
data.d1++;
}
};

Runnable r2 = () -> {
Thread t1 = Thread.currentThread();
for(;data.d2.get()<2;){
System.out.print(t1.getName()+" : "+data.d2.get()+" ");
data.d2.getAndIncrement();
}
};

Thread t1 = new Thread(r1, "T1");
Thread t2 = new Thread(r2, "T2");
t1.start();
t2.start();

}
}

You had to select 1 option(s)

T1 : 0 T2 : 0 T1 : 1 T2 : 1
Order is underministic.

T1 : 0 T1 : 1 T2 : 0 T2 : 1
or
T2 : 0 T2 : 1 T1 : 0 T1 : 1

T1 : 0 T2 : 0 T1 : 1 T2 : 1

It will not print anything.

None

Q4. Given :

//In Data.java
public class Data{
int value;
Data(int value){
this.value = value;
}
public String toString(){ return ""+value; }
}

and the following code fragments:
public void filterData(ArrayList dataList, Predicate p){
Iterator i = dataList.iterator();
while(i.hasNext()){
if(p.test(i.next())){
i.remove();
}
}
}
....
ArrayList al = new ArrayList();
Data d = new Data(1); al.add(d);
d = new Data(2); al.add(d);
d = new Data(3); al.add(d);

//INSERT METHOD CALL HERE
System.out.println(al);


Which of the following options can be inserted above so that it will print [1, 3]?

You had to select 1 option(s)

None

Q5. Consider the following program:

public class TestClass extends Thread
{
private static int threadcounter = 0;
public void run()
{
threadcounter++;
System.out.println(threadcounter);
}
public static void main(String[] args) throws Exception
{
for(int i=0; i<10; i++)
{
synchronized(TestClass.class)
{
new TestClass().start();
}
}
}
}

Which of the following is correct regarding the execution of the given program?

You had to select 2 option(s)

Numbers 1 to 10 will be printed (none repeated or missed) in a serial order.

Numbers 1 to 10 will be printed (none repeated or missed) in any order.

Total of 10 numbers will be printed

The final value of threadcounter just before the program terminates will be 10.

The final value of threadcounter just before the program terminates may be less than 10.

Q6. Given:

public record Student(int id) {
}

What is inserted by the compiler automatically in this record?

You had to select 3 option(s)

Canonical constructor

A toString method.

A clone method.

An equals method.

A getId method.

A zero-argument/no-args constructor.

Q7. What should be the return type of the following method?

public RETURNTYPE methodX( byte by){
var d = 10.0;
return (long) by/d*3;
}

You had to select 1 option(s)

int

long

double

float

byte

None

Q8. What will be result of attempting to compile the following code appearing in TestClass.java file?

import java.util.*;
package test;
public class TestClass{
public OtherClass oc = new OtherClass();
}
class OtherClass{
int value;
}

You had to select 1 option(s)

TestClass will fail to compile because the class OtherClass is used before it is defined.

There is no problem with the code.

TestClass will fail to compile because the class OtherClass must be defined in a file called OtherClass.java

The code will fail to compile because the order of the package and import statements is incorrect.

The code will fail to compile because of other reason(s).

None

Q9. What will the following code print when compiled and run?

class X{
public X(){
System.out.println("In X");
}
}

class Y extends X{
public Y(){
super();
System.out.println("In Y");
}
}

class Z extends Y{
public Z(){
System.out.println("In Z");
}
}

public class Test {

public static void main(String[] args) {
Y y = new Z();
}
}

You had to select 1 option(s)

It will not compile.

In X
In Y
In Z

In Z
In Y
In X

In Y
In X
In Z

In Z
In X
In Y

None

Q10. Given:

class Person implements Serializable{
String name;
Person(String name){
this.name = name;
}
}

class Student extends Person{
String school;
public Student(String name, String school){
super(name);
this.school = school;

}
public String toString(){
return name+" "+school;
}
}
public class TestClass {
public static void main(String[] args) {
Person p = new Student("Bob Dylan", "NYU");
try(
ObjectOutputStream oos = new ObjectOutputStream(
new FileOutputStream("student.ser"));

ObjectInputStream ois = new ObjectInputStream(
new FileInputStream("student.ser"));
){
oos.writeObject(p);
oos.flush();
System.out.println((Student)ois.readObject());
}
}
}

What can be done so that the above code prints Bob Dylan NYU when run?

You had to select 1 option(s)

Add implements Serializable clause to Student class.

Add implements Serializable, AutoCloseable clause to Student class.

Add throws IOException clause to the main method.

Add throws IOException, ClassCastException clause to the main method.

Add throws IOException, ClassNotFoundException clause to the main method.

Replace (Student)ois.readObject() with (Person)ois.readObject().

None

Q11. Given:

interface AmazingInterface{
String value = "amazing";
void amazingMethod(String arg);
}

abstract class AmazingClass implements AmazingInterface{
static String value = "awesome";
abstract void amazingMethod(String arg1, String arg2);
}


public class Awesome extends AmazingClass implements AmazingInterface {
public void amazingMethod(String arg1){ }
public void amazingMethod(String arg1, String arg2){ }

public static void main(String[] args){
AmazingInterface ai = new Awesome();

//INSERT CODE HERE
}

}

Identify the options that will cause compilation failure.

You had to select 3 option(s)

ai.amazingMethod(AmazingInterface.value, AmazingClass.value);

ai.amazingMethod(AmazingInterface.value);

((AmazingClass)ai).amazingMethod("x1", value);

ai.amazingMethod(value);

ai.amazingMethod("x1");

Q12. Which statements about the following code are correct?

interface House{
public default String getAddress(){
return "101 Main Str";
}
}

interface Bungalow extends House{
public default String getAddress(){
return "101 Smart Str";
}
}

class MyHouse implements Bungalow, House{

}

public class TestClass {

public static void main(String[] args) {
House ci = new MyHouse(); //1
System.out.println(ci.getAddress()); //2
}
}

You had to select 1 option(s)

Code for interface House will cause compilation to fail.

Code for interface Bungalow will cause compilation to fail.

Code for class MyHouse will cause compilation to fail.

Line at //1 will cause compilation to fail.

Line at //2 will cause compilation to fail.

The code will compile successfully.

None

Q13. What will be written to the standard output when the following program is run?

You had to select 1 option(s)

25

24

23

22

None of the above.

None

Q14. Given:

char a = 'a', b = 98; //1
int a1 = a; //2
int b1 = (int) b; //3
System.out.println((char)a1+(char)b1); //4

What is the output?

You had to select 1 option(s)

Compilation error at //1

Compilation error at //2

Compilation error at //3

Compilation error at //4

ab

195

None

Q15. What will be the output of the following lines ?

System.out.println("" +5 + 6); //1
System.out.println(5 + "" +6); // 2
System.out.println(5 + 6 +""); // 3
System.out.println(5 + 6); // 4

You had to select 1 option(s)

56
56
11
11

11
56
11
11

56
56
56
11

56
56
56
56

56
56
11
56

None

Q16. Which of the following are valid implementations of java.util.Comparator?

You had to select 3 option(s)

Q17. Given:

class MyProcessor{
public void process(){
System.out.println("Processing ");
}
}
public class TestClass {

public static void main(String[] args) {
process(()->new MyProcessor()); //1 REPLACE THIS LINE OF CODE
}

public static void process(Supplier s){
s.get().process();
}
}

Which of the following options correctly replaces the line marked //1 with code that uses method reference?

You had to select 1 option(s)

TestClass.process(MyProcessor::new);

TestClass.process(new::MyProcessor);

TestClass.process(MyProcessor::new());

TestClass.process(new::MyProcessor());

TestClass.process(MyProcessor()::new);

None

Q18. Consider the following class...

class Test{
public static void main(String[ ] args){
var a = new int[]{ 1, 2, 3, 4 };
int[] b = { 2, 3, 1, 0 };
System.out.println( a [ (a = b)[3] ] );
}
}

What will it print when compiled and run ?

You had to select 1 option(s)

It will not compile.

It will throw ArrayIndexOutOfBoundsException when run.

It will print 1.

It will print 3.

It will print 4

None

Q19. What is the effect of compiling and running the code shown below?

public class TestClass{
public static void main (String args []){
var sum = 0;
for (int i = 0, j = 10; sum > 20; ++i, --j) // 1
{
sum = sum+ i + j;
}
System.out.println("Sum = " + sum);
}
}

You had to select 1 option(s)

Compile time error at line 1.

It will print Sum = 0

It will print Sum = 20

Runtime error.

None of the above.

None

Q20. Consider:

public class Outer
{
int i = 10;
class Inner
{
public void methodA()
{
//line 1.
}
}
}

Which of the following statements are valid at line 1?

You had to select 2 option(s)

System.out.println(this.i);

System.out.println(i);

System.out.println(Outer.this.i);

'i' cannot be accessed inside the inner class method.

The code cannot be compiled.

Q21. A novice java programmer is unable to get a file named Coffee.java compiled. It contains the following enum definition:

public enum Coffee //1
{
ESPRESSO("Very Strong"), MOCHA, LATTE; //2
public String strength; //3
Coffee(String strength) //4
{
this.strength = strength; //5
}
public String toString(){ return strength + ordinal(); } //6
}

Which line is causing the problem?

You had to select 1 option(s)

1

2

3

4

5

6

None

Q22. You are trying to modularize an existing application that uses a few Apache open source jar files. Some of those jar files have been modularized but some have not. Details of such jar files are as follows:

commons-beanutils-1.9.jar

commons-collections4-4.0.jar
(Automatic-Module-Name: org.apache.commons.collections4)

commons-lang3-3.6.jar
(Automatic-Module-Name: org.apache.commons.lang3)

commons-text-1.2.jar
(Automatic-Module-Name: org.apache.commons.text)

What should the module-info file for your application contain?

You had to select 1 option(s)

module myapp{
requires commons.beanutils-1.9;
requires commons.collections4-4.0;
requires commons.lang3-3.6;
requires commons.text-1.2;
}

module myapp{
requires org.apache.commons.beanutils;
requires org.apache.commons.collections4;
requires org.apache.commons.lang3;
requires org.apache.commons.text;
}

module myapp {
requires commons.beanutils;
requires commons.collections4;
requires commons.lang3;
requires commons.text;
}

module myapp{
requires commons.beanutils;
requires org.apache.commons.collections4;
requires org.apache.commons.lang3;
requires org.apache.commons.text;
}

None

Q23. Given:

String s1 = "Hello World";
String s2 = """
Hello World""";
System.out.println((s1 == s2)+" "+s1.equals(s2));

What is the result?

You had to select 1 option(s)

true true

true false

false false

false true

None

Q24. What will the following program print when compiled and run:

public class TestClass {
public static void main(String[] args) {
someMethod();
}

static void someMethod(Object parameter) {
System.out.println("Value is "+parameter);
}
}

You had to select 1 option(s)

It will not compile.

Value is null

Value is

It will throw a NullPointerException at run time.

None

Q25. Given:

class A{
public List getList(){
//valid code
};
}
class B extends A{
@Override
*INSERT CODE HERE*
//valid code
};
}

What can be inserted in the above code?

You had to select 3 option(s)

Q26. Which of the lines will cause a compile time error in the following program?

public class MyClass{
public static void main(String args[]){
char c;
int i;
c = 'a';//1
i = c; //2
i++; //3
c = i; //4
c++; //5
}
}

You had to select 1 option(s)

line 1

line 2

line 3

line 4

line 5

None

Q27. Which of the following is/are a valid functional interface(s)?

You had to select 3 option(s)

@FunctionalInterface
public interface FI{
int m1();
boolean equals(Object o);
}

@FunctionalInterface
public interface FI{
String toString = "VALUE";
int m1();
String m2(String s);
}

public interface FI{
int m1();
String toString();
}

@FunctionalInterface
public interface FI{
int m1();
default int m2(){ return 10; }
String toString();
}

@FunctionalInterface
public interface FI{
String toString = "VALUE";
boolean equals(Object o);
}

@FunctionalInterface
public interface FI{
String toString();
}

Q28. What will be the contents of d at the end of the following code?

Deque d = new ArrayDeque();
d.add(1);
d.push(2);
d.pop();
d.offerFirst(3);
d.remove();
System.out.println(d);

You had to select 1 option(s)

1

2

3

Exception at run time.

It will not compile.

None

Q29. Identify correct statement(s) about the following code:

public class FunWithOptional{
public static String getValue(){
return null;
}
public static void main(String[] args) {
Optional stro = Optional.of(getValue());//1
System.out.println(stro.isPresent());//2
System.out.println(stro.get());//3
System.out.println(stro.orElse(null));//4
}
}

You had to select 1 option(s)

It will throw a NullPointerException at //1

It will throw a NullPointerException at //3

It will throw a NoSuchElementException at //3

It will throw a NullPointerException at //4

It will print:
false
null
null

None

Q30. Given that the file test.txt contains :

12345678
What will the following code print when compiled and run?

public static void main(String[] args) throws Exception{
try(var fis = new FileInputStream("c:\\temp\\test.txt");
var isr = new InputStreamReader(fis)){
while(isr.ready()){
isr.skip(1);
int i = isr.read();
char c = (char) i;
System.out.print(c);
}
}
}

You had to select 1 option(s)

It will not compile.

It will throw an exeception when run.

It will print just 2

It will run without any exception but will not print anything.

It will print 2468

None

Q31. Given the following contents of module-info.java,

module enthu.finance{
exports com.enthu.Reports;
requires enthu.utils;
}

Select correct statements.

You had to select 1 option(s)

Module name is finance.

com.enthu.Reports is the name of the class that this module exports.

This module depends on enthu.utils package.

This file must be present in enthu.finance directory if the source code is to be compiled using the --module-source-path option.

Other modules that depend on this module will be able to access com.enthu.Reports package as well as enthu.utils package.

None

Q32. Consider the following class :

class Test{
public static void main(String[] args){
for (var i = 0; i < 10; i++) System.out.print(i + " "); //1
for (var i = 10; i > 0; i--) System.out.print(i + " "); //2
var i = 20; //3
System.out.print(i + " "); //4
}
}

Which of the following statements are true?

Consider the following class :

class Test{
public static void main(String[] args){
for (var i = 0; i < 10; i++) System.out.print(i + " "); //1
for (var i = 10; i > 0; i--) System.out.print(i + " "); //2
var i = 20; //3
System.out.print(i + " "); //4
}
}

Which of the following statements are true?

You had to select 4 option(s)

As such, the class will compile and print "20 " (without quotes) at the end of its output.

It will not compile if line 3 is removed.

It will not compile if line 3 is removed and placed before line 1.

It will not compile if line 4 is removed and placed before line 3.

Only Option 2, 3, and 4 are correct.

Q33. Given the following method:

public static void copy(String fileName1, String fileName2) throws Exception{
try (
InputStream is = new FileInputStream(fileName1);
OutputStream os = new FileOutputStream(fileName2); ) {
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
}
}

What will happen fileName1 contains only 100 bytes and fileName2 contains 200 bytes?

You had to select 1 option(s)

An exception will be thrown while reading from the file.

An exception will be thrown while writing to the file.

fileName2 will end up with 300 bytes.

fileName2 will end up with 200 bytes.

fileName2 will end up with 100 bytes.

None

Q34. Given:

interface Instrument{
default void reset(){
System.out.println("In Instrument");
}
}

class Debt implements Instrument{
}

class Bond extends Debt{
public void reset(){
super.reset();
System.out.println("In Bond");
}
}

class ZCBond extends Bond{
ZCBond(){
reset();
}
public void reset(){
super.reset();
System.out.println("In ZCBond");
}

public static void main(String args[]){
Instrument i = new ZCBond();
}

}

What is the output?

You had to select 1 option(s)

The Bond class will fail to compile.

The Debt class will fail to compile.

In Instrument
In Bond
In ZCBond

In ZCBond
In Bond
In Instrument

In Bond
In ZCBond

In ZCBond
In Bond

None

Q35. Given the following code:

public class Valuator {
public AtomicInteger status = new AtomicInteger(0);
public void valuate() {
int oldstatus = status.get();
/* valid code here */
int newstatus = //determine new status

//INSERT CODE HERE

}
}
Assuming that an instance of this class is shared among multiple threads, you want to update the status to newstatus only if the oldstatus has not changed. Which of the following lines of code will you use?

You had to select 1 option(s)

status.compareAndSet(oldstatus, newstatus);

status.compareAndSet(newstatus, oldstatus);

status.setIfUnchanged(oldstatus, newstatus);

status.setIfUnchanged(newstatus, oldstatus);

if(oldstatus == status.get()) status.set(newstatus);

None

Q36. Assume that the following directory exists:

c:\a\b\c

A File object is created as follows:

var f = new File("c:\\a\\b\\c\\d\\e");

Given that directories d and e do not exist under c, which of the following statements are correct?

You had to select 2 option(s)

Q37. Consider the following class :

public class Parser{
public static void main( String[] args){
try{
int i = 0;
i = Integer.parseInt( args[0] );
}
catch(NumberFormatException e){
System.out.println("Problem in " + i );
}
}
}
What will happen if it is run with the following command line:
java Parser 1_00

You had to select 1 option(s)

It will print Problem in 0

It will throw an exception and end without printing anything.

It will not even compile.

It will not print anything if the argument is 100 instead of 1_00.

None of the above.

None

Q38. What will the following code print when run?

import java.nio.file.Path;
import java.nio.file.Paths;

public class PathTest {
static Path p1 = Paths.get("c:\\main\\project\\Starter.java");

public static String getRoot(){
String root = p1.getRoot().toString();
return root;
}

public static void main(String[] args) {
System.out.println(getRoot());
}
}

You had to select 1 option(s)

\

c:

c:\

It will print an empty string.

None

Q39. Which of the following declarations are valid?

You had to select 4 option(s)

float f1 = 1.0;

float f = 43e1;

float f = -1;

float f = 0x0123;

float f = 4;

var f1 = 1.0;
float f2 = f1;

var f = 4f;

Q40. Given:

class Base{
public Collection transform(Collection list)
{
return new ArrayList();
}
}

class Derived extends Base{
/* public Collection transform(Collection list) {
return new HashSet();
}; */ //1

/* public Collection transform(Stream list) {
return new HashSet();
}; */ //2

/* public List transform(Collection list) {
return new ArrayList();
}; */ //3

/*public Collection transform(Collection list) {
return new HashSet();
}; */ //4

/* public Collection transform(Collection list) {
return new HashSet();
}; */ //5

}


Identify correct statements about the methods defined in Derived assuming they are uncommented one at a time individually.

You had to select 2 option(s)

//1 correctly overrides the method in Base

//1 will cause compilation failure.

//2 correctly overrides the method in Base

//3 correctly overrides the method in Base

//4 will cause compilation failure.It is actually a valid override.

//5 correctly overrides the method in Base

//5 correctly overloads the method in Base

Q41. Consider the following class:

class TestClass{
void probe(int... x) { System.out.println("In ..."); } //1

void probe(Integer x) { System.out.println("In Integer"); } //2

void probe(long x) { System.out.println("In long"); } //3

void probe(Long x) { System.out.println("In LONG"); } //4

public static void main(String[] args){
Integer a = 4; new TestClass().probe(a); //5
int b = 4; new TestClass().probe(b); //6
}
}

What will it print when compiled and run?

You had to select 2 option(s)

In Integer and In long

In ... and In LONG, if //2 and //3 are commented out.

In Integer and In ..., if //4 is commented out.

It will not compile, if //1, //2, and //3 are commented out.

In LONG and In long, if //1 and //2 are commented out.

Q42. Which of the options will create and initialize a matrix of ints as shown below?

	1
	1
	1
	1
	1

You had to select 1 option(s)

None

Q43. What will the following code print when compiled and run?

You had to select 1 option(s)

Input value must be smaller than X and larger than 0

Input value must be smaller than 10 and larger than 0

Input value must be smaller than X

Input value must be smaller than 10

None

Q44. What will the following code print?

int i = 0;
int j = 1;
if( (i++ == 0) & (j++ == 2) ){
i = 12;
}
System.out.println(i+" "+j);

You had to select 1 option(s)

1 2

2 3

12 2

12 1

It will not compile.

None

Q45. Identify the correct statement(s).

You had to select 2 option(s)

To customize the behavior of class serialization, the readObject and writeObject methods should be implemented.

To customize the behavior of class serialization, the defaultReadObject and defaultWriteObject methods should be overridden.

Objects of a final class cannot be serialized.

Constructor of the class for an object being deserialized is never invoked except for record classes.

While serializing an object, only those objects in the object graph that implement Serializable are serialized and the rest are ignored.

Q46. Given:

public class Buddy {
Buddy upper;
String name;
public Buddy(){ }

public Buddy(String name){
this.name = name;
}
public Buddy(String name, Buddy upper){
this.name = name;
Buddy b = new Buddy(upper.name);//1
upper = b; //2
}

public static void main(String[] args) {
Buddy b1 = new Buddy("A"); //3
Buddy b2 = new Buddy("B", b1); //4
System.out.println(b1); //5
}
}

Identify correct statements.

You had to select 2 option(s)

Object created at line //1 will be eligible for garbage collection after line //2.

Object created at line //1 will be eligible for garbage collection after line //5.

Object created at line //3 will be eligible for garbage collection after line //4.

Object created at line //3 will be eligible for garbage collection after line //5.

Q47. Which of the given options if put at //1 will correctly instantiate objects of various classes defined in the following code?

public class TestClass
{
public class A{
}
public static class B {
}
public static void main(String args[]){
class C{
}
//1
}
}

You had to select 2 option(s)

new TestClass().new A();

new TestClass().new B();

new TestClass.A();

new C();

new TestClass.C();

Q48. What will the following code print when compiled and run?

var numA = new Integer[]{1, 2};
var list1 = new ArrayList(List.of(numA));
list1.add(null);
var list2 = Collections.unmodifiableList(list1);
list1.set(2, 3);
List<List> list3 = List.of(list1, list2);
System.out.println(list3);

You had to select 1 option(s)

[[1, 2, 3], [1, 2, 3]]

[1, 2, 3]

[[1, 2, 3], [1, 2, null]]

[1, 2, null]

[1, 2, 3, null]

It will throw an exception at run time.

None

Q49. What will the following code print if file test1.txt exists but test2.txt doesn't exist?

public class FileCopier {

public static void copy1(Path p1, Path p2) throws Exception {
Files.copy(p1, p2, StandardCopyOption.COPY_ATTRIBUTES,
StandardCopyOption.REPLACE_EXISTING);
}


public static void main(String[] args) throws Exception {
Path p1 = Paths.get("c:\\temp\\test1.txt");
Path p2 = Paths.get("c:\\temp\\test2.txt");
copy1(p1, p2);
if(Files.isSameFile(p1, p2)){
System.out.println("file copied");
}else{
System.out.println("unable to copy file");
}
}
}

You had to select 1 option(s)

An exception at run time if either of p1 or p1 is a symbolic link.

It will print file copied and test2.txt will contains the same data as test1.txt.

It will print file copied but test2.txt will NOT contain the same data as test1.txt.

It will print unable to copy file but test2.txt will contain the same data as test1.txt.

It will print unable to copy file and test2.txt will not be created.

None

Q50. Your application is packaged in myapp.jar and depends on a jar named datalayer.jar, which in turn depends on mysql-connector-java-8.0.11.jar.

You have modularized myapp without waiting for datalayer and mysql driver to be modularized and the following are the contents of myapp's module-info:

module abc.myapp{
requires datalayer;
}

Assming that com.abc.myapp.Main is the main class of your application that you want to execute, which of the following commands will successfully launch your application?

You had to select 3 option(s)

java -classpath mysql-connector-java-8.0.11.jar;datalayer.jar;myapp.jar com.abc.myapp.Main

java -module-path mysql-connector-java-8.0.11.jar;datalayer.jar;myapp.jar com.abc.myapp.Main

java -p mysql-connector-java-8.0.11.jar;datalayer.jar;myapp.jar -m com.abc.myapp.Main

java -p mysql-connector-java-8.0.11.jar;datalayer.jar;myapp.jar -m abc.myapp/com.abc.myapp.Main

java -cp mysql-connector-java-8.0.11.jar -p datalayer.jar;myapp.jar -m abc.myapp/com.abc.myapp.Main

Q51. Given:

public class PlaceHolder {
private K k;
private V v;
public PlaceHolder(K k, V v){
this.k = k;
this.v = v;
}
public K getK() { return k; }
public static PlaceHolder getDuplicateHolder(X x){
return new PlaceHolder(x, x);
}
public static void main(String[] args) {
PlaceHolder ph1 = PlaceHolder.getDuplicateHolder("b"); //1

PlaceHolder ph2 = PlaceHolder.getDuplicateHolder("b"); //2

PlaceHolder ph3 = PlaceHolder.getDuplicateHolder("b"); //3

PlaceHolder ph4 = new PlaceHolder("a", "b"); //4

PlaceHolder ph5 = new PlaceHolder(10, 10); //5

}
}

Which lines will fail compilation?

You had to select 3 option(s)

//1

//2

//3

//4

//5

Q52. Given the following interface definition, which definitions are valid?

interface I1{
void setValue(String s);
String getValue();
}

You had to select 2 option(s)

class A extends I1{
String s;
@Override
void setValue(String val) { s = val; }
String getValue() { return s; }
}

interface I2 extends I1{
void analyse();
}

abstract class B implements I1{
@Override
int getValue(int i) { return 0; }
}

interface I3 implements I1{
void perform_work();
}

abstract class B implements I1{
int getValue(int i) { return 0; }
}

Q53. What will the following code fragment print when compiled and run?

Locale myloc = new Locale.Builder().setLanguage("en").setRegion("UK").build(); //L1
ResourceBundle msgs = ResourceBundle.getBundle("mymsgs", myloc);

Enumeration en = msgs.getKeys();
while(en.hasMoreElements()){
String key = en.nextElement();
String val = msgs.getString(key);
System.out.println(key+" : "+val);
}

Assume that only the following two properties files (contents of the file is shown below the name of the file) are accessible to the code.

1. mymsgs.properties
okLabel=OK
cancelLabel=Cancel

2. mymsgs_en_UK.properties
okLabel=YES
noLabel=NO

You had to select 1 option(s)

It will not compile due to line L1.

It will not print anything.

okLabel=OK
cancelLabel=Cancel

okLabel=YES
noLabel=NO

noLabel : NO
okLabel : YES
cancelLabel : Cancel

noLabel : NO
okLabel : OK
cancelLabel : Cancel

None

Q54. Which statements regarding the following code are correct?

class Outer
{
private void Outer() { }
protected class Inner
{
}
}

You had to select 1 option(s)

This code will not compile.

Constructor for Outer is public.

Constructor for Outer is private.

Constructor for Inner is public.

Constructor for Inner is protected.

None

Q55. Consider the following program...

public class Outer
{
private double d = 10.0;
//put inner class here.
}

Which of the following options can be inserted in Outer class?

You had to select 3 option(s)

class Inner
{
public void m1() { this.d = 20.0; }
}

abstract class Inner
{
static int i1;
public void m1() { d = 20.0; }
}

final class Inner
{
public void m1() { d = 20.0; }
}

private class Inner
{
public void m1() { d = 20.0; }
}

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