OCP: Java SE 11 Certification (1Z0-819) Practice Test 4

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Welcome to your Java Test - 4

Name

Email

Phone

1. 

Question: Identify correct statements about the following code:

interface Readable{ }

sealed class Document implements Readable permits Book{ }

non-sealed class Book implements Readable { }

final class Journal extends Book{ }

Select 2 option(s)

Both Document and Book will cause compilation errors.

All three classes Document, Book, and Journal will cause compilation errors.

Making the Book class extend Document will eliminate all compilation errors.

Adding an extends Document clause to Book and removing the extends Book clause from Journal will eliminate all compilation errors.

Only the Journal class will cause compilation error.

Making the Book class extend Document will cause Journal class to fail compilation.

2. 

Question: What can be inserted at //2 so that 6 will be printed by the following code?

AtomicInteger ai = new AtomicInteger(5);
//2 INSERT CODE HERE
System.out.println(x);

Select 2 option(s)

int x = ai.increment();

int x = ai.getAndIncrement();

int x = ai + 1;

int x = ai.incrementAndGet();

int x = ai.addAndGet(1);

int x = ai.getAndSet(6);

3. 

Question: Given the following code that appears inside a method:

var values = new ArrayList();
//INSERT CODE HERE

What can be inserted at the given location without causing any compilation error?

Select 4 option(s)

values.forEach(var k->System.out.print(k.length()));

values.forEach( (var k)->System.out.print(k.length()));

values.forEach( k -> System.out.print(k.length()));

var k = values.get(0);
values.add(k);

for(var value : values){ }

values.add(1);

4. 

Question: Given:

class Triangle{
public int base;
public int height;
private static double ANGLE;

public static double getAngle();

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

Identify the correct statements:

Select 1 option(s)

It will not compile because it does not implement setAngle method.

It will not compile because ANGLE cannot be private.

It will not compile because getAngle() has no body.

It will not compile because ANGLE field is not initialized.

It will not compile because of the name of the method Main instead of main.

None

5. 

Question: What will the following code print when compiled and run?

Instant start = Instant.parse("2022-06-25T16:13:30.00z");
start.plus(10, ChronoUnit.HOURS);
System.out.println(start);

Duration timeToCook = Duration.ofHours(1);
Instant readyTime = start.plus(timeToCook);
System.out.println(readyTime);

LocalDateTime ltd = LocalDateTime.ofInstant(readyTime, ZoneId.of("GMT+2"));
System.out.println(ltd);

Select 1 option(s)

2022-06-25T16:13:30Z
2022-06-25T17:13:30Z
2022-06-25T15:13:30

T16:13:30Z
T17:13:30Z
2022-06-25T19:13:30

2022-06-25T16:13:30Z
2022-06-25T17:13:30Z
2022-06-25T19:13:30

T16:13:30Z
T17:13:30Z
2022-06-25T15:13:30

T16:13:30Z
T17:13:30Z
< exception stack trace >

< exception stack trace >

None

6. 

Question: Which of the following code segments will correctly write the text FINAL TEXT at the end of a file file.txt?

Select 1 option(s)

RandomAccessFile raf = new RandomAccessFile("file.txt", "a");
raf.writeChars("FINAL TEXT");

RandomAccessFile raf = new RandomAccessFile("file.txt", "rw");
raf.writeChars("FINAL TEXT");

RandomAccessFile raf = new RandomAccessFile("file.txt", "a");
raf.seek( raf.length() );
raf.writeChars("FINAL TEXT");

RandomAccessFile raf = new RandomAccessFile("file.txt", "rw");
raf.seek( raf.length() );
raf.writeChars("FINAL TEXT");

RandomAccessFile raf = new RandomAccessFile("file.txt", "rw");
raf.seek( raf.length() - 1);
raf.writeChars("FINAL TEXT");

None

7. 

Question: Which of the following options correctly makes use of java.util.concurrent.Callable?

Select 1 option(s)

None

8. 

Question: Consider the following code snippet:

public class Test{
void test(){
MyClass obj = new MyClass();
obj.name = "jack";
// 1 insert code here
}
}

//In MyClass.java
public class MyClass{
int value;
String name;
}

What can be inserted at // 1, which will make the object referred to by obj eligible for garbage collection?

Select 1 option(s)

obj.destroy();

Runtime.getRuntime().gc();

obj = null;

obj.finalize()

obj.name = null; as well as obj = null;

None

9. 

Question: What can be added to the following Person class so that it is properly encapsulated and the code prints 29?

class Person{
//Insert code here
}
public class Employee extends Person{
public static void main(String[] args) {
Employee e = new Employee();
e.setAge(29);
System.out.println(e.getAge());
}
}

Select 2 option(s)

private int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

protected int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

private int age;
private int getAge() {
return age;
}
private void setAge(int age) {
this.age = age;
}

private int age;
public int getAge() {
return age;
}
protected void setAge(int age) {
this.age = age;
}

10. 

Question: Given:

interface IHello
{
public int hello(int x, int y);
public long hello(long x, long y);
}

Which of the following options are valid definitions in a different file assuming that the above definition is already available?

Select 3 option(s)

interface IHello2 extends IHello{
private static void print(){ };
}

interface iHello2 implements IHello{ }

abstract class Hello implements IHello{}

abstract class Hello implements IHello{
public short hello(short a, short b){ return 0; }
}

abstract class Hello implements IHello{
public short hello(int a, int b){ return 0; }
}

11. 

Question: 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:\\a\\b\\c");

public static String getValue(){
String x = p1.getName(1).toString();
String y = p1.subpath(1,2).toString();
return x+" : "+y;
}

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

Select 1 option(s)

\b : \b

b : b

b : b\c\

a : a\b

b : b\c

None

12. 

Question: Given:

List ls = Arrays.asList(1, 2, 3);
Which of the following options will compute the sum of all Integers in the list correctly?

Select 2 option(s)

double sum = ls.stream().sum();

double sum = ls.stream().reduce(0, (a, b)->a+b);

double sum = ls.stream().mapToInt(x->x).sum();

double sum = 0;
ls.stream().forEach(a->{ sum=sum+a; });

double sum = 0;
ls.stream().peek(x->{sum=sum+x;}).forEach(y->{});

13. 

Question: What will the following code print when compiled and run?

public class SortTest {
public static void main(String[] args) {
Object[] sa = { 100, 100.0, "100" };
Collections.sort(Arrays.asList(sa), null);
System.out.println(sa[0]+" "+sa[1]+" "+sa[2] );
}

}

Select 1 option(s)

100 100 100.0

100.0 100 100

100 100.0 100

It will not compile.

It will throw an exception at run time.

None

14. 

Question: Consider the following code:

public class ArrayTest {

static int[][] table = new int[2][3];

public static void init() {
for (var x = 0; x < table.length; x++) {
for (var y = 0; y < table[x].length; y++) {

//insert code to initialize

}
}
}

public static void multiply() {
for (var x = 0; x < table.length; x++) {
for (var y = 0; y < table[x].length; y++) {

//insert code to multiply

}
}
}
}

Which of the following options can be used in the code above so that the init method initializes each table element to the sum of its row and column number and the multiply method just multiplies the element value by 2?

Select 1 option(s)

table[x, y] = x+y;
and
table[x, y] = table[x, y]*2;

table[x][y] = x+y;
and
table[x][y] = table[x][y]*2;

table[[x] [y]] = x+y;
and
table[[x] [y]] = table[[x] [y]]*2;

table(x, y) = x+y;
and
table(x, y) = table(x, y)*2;

None

15. 

Question: Consider the following code:

public static boolean isValid(Path p){

return p.startsWith("temp") && p.endsWith("clients.dat");
}

public static void writeData() {
var p1 = Paths.get("\\temp\\records");
var p2 = p1.resolve("clients.dat");
System.out.println(p2+" "+isValid(p2));

}

What will be printed when the method writeData() is executed?

Select 1 option(s)

\temp\records\clients false

temp\records\clients.dat false

\temp\records\clients.dat false

temp\records\clients.dat true

clients.dat false

\clients.dat false

None

16. 

Question: Consider the following code snippet:

XXXX m ;
//other code that initializes m
switch( m ){
case 32 -> System.out.println("32");
case 64 -> System.out.println("64");
case 128 -> System.out.println("128");
}

What type can 'm' be of so that the above code compiles and runs as expected ?

Select 3 option(s)

int m;

long m;

char m;

byte m;

short m;

var m;

17. 

Question: Consider the following lines of code:

boolean greenLight = true;
boolean pedestrian = false;
boolean rightTurn = true;
boolean otherLane = false;

You can go ahead only if the following expression evaluates to 'true' :

(( (rightTurn && !pedestrian || otherLane)
|| ( ? && !pedestrian && greenLight ) ) == true )

What variables can you put in place of '?' so that you can go ahead?

Select 1 option(s)

rightTurn

otherLane

Any variable would do.

None of the variable would allow to go.

None

18. 

Question: Identify correct statements about java modules.

Select 2 option(s)

module-info.java may be placed inside any folder of the module.

module-info.java must not be empty.

If module-info.java is absent, then the module name is inferred from the directory name in which the source code resides.

module-info.java is compiled into module-info.class by the compiler.

module-info.java always belongs to the default package.

19. 

Question: What will the following code print?

char[] a = { 'h', 'e', 'l', 'l'};
char[] b = { };

int x = Arrays.compare(a, b);
int y = Arrays.mismatch(a, b);
System.out.println(x+" "+y);

Select 1 option(s)

It will throw an IndexOutOfBoundsException at run time.

4 0

1 0

-4 -4

-4 4

None

20. 

Question: Given the following code:

class TestClass{
public static void main(String args[]){
java.sql.Timestamp ts = new java.sql.Timestamp(1);
java.awt.Label lb = new java.awt.Label("Time is "+ts);
System.out.println(lb);
}
}

and the following commands:

javac TestClass.java
jdeps -summary TestClass.class

What will be the output?

Select 1 option(s)

None

21. 

Question: Given:

public record Journal(int id, String name){
public Journal(){
//1
this.id = 10; this.name="none"; //2
//3
}

public Journal(int id, String name){
this.id = id; this.name=name;
}
}

Identify correct statement(s).

Select 1 option(s)

This record class will compile without any error.

It will compile if the following line is inserted at //1:
this(10, "");

It will compile if the following line is inserted at //3:
this(10, "");

It will compile if the following line is inserted at //1 and the existing line at //2 is removed:
this(10, "");

It will compile if the line at //2 is removed.

None

22. 

Question: Consider the following class...

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

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

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

public static void main(String[] args){
String a = "hello";
new TestClass().probe(a);
}
}

What will be printed?

Select 1 option(s)

In Integer

In Object

In Long

It will not compile.

None

23. 

Question: What will the following code fragment print?

Path p1 = Paths.get("c:\\personal\\.\\photos\\..\\readme.txt");
Path p2 = Paths.get("c:\\personal\\index.html");
Path p3 = p1.relativize(p2);
System.out.println(p3);

You had to select 1 option(s)

..\..\..\..\index.html

..\..\..\index.html

..\index.html

c:\personal\index.html

None

24. 

Question: Given the class

// Filename: Test.java
public class Test{
public static void main(String args[]){
for(int i = 0; i< args.length; i++){
System.out.print(" "+args[i]);
}
}
}
Now consider the following 3 options for running the program:
a: java Test
b: java Test param1
c: java Test param1 param2

Which of the following statements are true?

Select 2 option(s)

The program will throw java.lang.ArrayIndexOutOfBoundsException on option a.

The program will throw java.lang.NullPointerException on option a.

The program will print Test param1 on option b.

It will print param1 param2 on option c.

It will not print anything on option a.

25. 

Question: Consider the following code:

package mypack;
public class TestOuter
{
public static class TestInner
{
public void sayIt(){ System.out.println("hello"); }
}
public static void main(String[] args){
//call here
}
}

Which of the following options are correct?

Select 2 option(s)

An instance of the nested class can be created from any class using: new TestOuter.TestInner().
(Assuming appropriate imports).

An instance of the nested class can be created only from classes of package mypack.

An instance of the nested class can be created from a class of package mypack using: new TestInner().
(Assuming appropriate imports).

It will not compile.

TestInner.sayIt(); can be inserted in main.

26. 

Question: What will the following code print when compiled and run:

public class TestClass {

public static void main(String[] args){
var k = 2;
do{
System.out.println(k);
}while(--k>0);
}
}

Select 1 option(s)

1

1
0

2
1

2
1
0

It will keeping printing numbers in an infinite loop.

It will not compile.

None

27. 

Question: A developer has written the following code snippet:

Console c = System.console(); //1
String line = c.readLine("Please enter your name:"); //2
System.out.println("Hello, "+line); //3

Which of the following checked exceptions may be thrown by this code?

Select 1 option(s)

java.io.IOException

java.lang.Exception

java.io.EOFException

None

None

28. 

Question: What will the following code snippet print?

int count = 0, sum = 0;
do{
if(count % 3 == 0) continue;
sum+=count;
}
while(count++ < 11);
System.out.println(sum);

Select 1 option(s)

49

48

37

36

38

None

29. 

Question: Given the following code, which statements can be placed at the indicated position without causing compile and run time errors?

public class Test{
int i1;
static int i2;
public void method1(){
int i;
// ... insert statements here
}
}

Select 3 option(s)

i = this.i1;

i = this.i2;

this = new Test( );

this.i = 4;

this.i1 = i2;

30. 

Question: Given that Daylight Savings Time ends on Nov 1 at 2 AM in US/Eastern time zone, what will the following code print -

LocalDateTime ld = LocalDateTime.of(2022, Month.OCTOBER, 31, 10, 0);

ZonedDateTime date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
date = date.plus(Duration.ofDays(1));
System.out.println(date);

date = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
date = date.plus(Period.ofDays(1));
System.out.println(date);

Select 1 option(s)

2015-11-01T09:00-05:00[US/Eastern]
2015-11-01T09:00-05:00[US/Eastern]

2015-11-01T09:00-05:00[US/Eastern]
2015-11-01T10:00-05:00[US/Eastern]

2015-11-01T10:00-05:00[US/Eastern]
2015-11-01T09:00-05:00[US/Eastern]

2015-11-01T10:00-05:00[US/Eastern]
2015-11-01T10:00-05:00[US/Eastern]

None

31. 

Question: This following code appears in a file named VehicleType.java. Why would it not compile?

//In file VehicleType
package objective1;
public enum VehicleType
{

SUV, SEDAN, VAN, SPORTSCAR;

public VehicleType()
{

}

}

Select 1 option(s)

VehicleType's definition cannot be public.

VehicleType's constructor cannot be public.

package statement is invalid for VehicleType.

VehicleType must be defined as a class instead of enum since it is the only definition in the file.

None

32. 

Question: What will the following class print?

class InitTest{
public static void main(String[] args){
int a = 10;
int b = 20;
a += (a = 4);
b = b + (b = 5);
System.out.println(a+ ", "+b);
}
}

Select 1 option(s)

It will print 8, 25

It will print 4, 5

It will print 14, 5

It will print 4, 25

It will print 14, 25

None

33. 

Question: Given:

public class Item{
private String name;
private String category;
private double price;

public Item(String name, String category, double price){
this.name = name;
this.category = category;
this.price = price;
}

//accessors not shown
}

What will the following code print?

List items = Arrays.asList(
new Item("Pen", "Stationery", 3.0),
new Item("Pencil", "Stationery", 2.0),
new Item("Eraser", "Stationery", 1.0),
new Item("Milk", "Food", 2.0),
new Item("Eggs", "Food", 3.0)
);

ToDoubleFunction priceF = Item::getPrice; //1

items.stream()
.collect(Collectors.groupingBy(Item::getCategory)) //2
.forEach((a, b)->{
double av = b.stream().collect(Collectors.averagingDouble(priceF)); //3
System.out.println(a+" : "+av);
});

Select 1 option(s)

Stationery : 2.0
Food : 2.5

[Pen : 3.0, Pencil : 2.0, Eraser : 1.0] : 2.0
[Milk : 2.0, Eggs : 3.0] : 2.5

Pen : 3.0, Pencil : 2.0, Eraser : 1.0 : 2.0
Milk : 2.0, Eggs : 3.0 : 2.5

Stationery : [Pen : 3.0, Pencil : 2.0, Eraser : 1.0] : 2.0
Food : [Milk : 2.0, Eggs : 3.0] : 2.5

Compilation error due to code at //1

Compilation error due to code at //2

Compilation error due to code at //3

None

34. 

Question: What will the following program print when run?

class Super{
public String toString(){
return "4";
}
}
public class SubClass extends Super{
public String toString(){
return super.toString()+"3";
}
public static void main(String[] args){
System.out.println( new SubClass() );
}
}

Select 1 option(s)

43

7

It will not compile.

It will throw an exception at runtime.

None of the above.

None

35. 

Question: How many times will the line marked //1 be called in the following code?

var x = 10;
do{
x--;
System.out.println(x); // 1
}while(x<10);

Select 1 option(s)

0

1

9

10

None of these.

None

36. 

Question: What will the following code print when run?

public class TestClass {
public static void main(String[] args) throws Exception { //1

var flag = true; //2
switch (flag){ //3
case true -> System.out.println("true");
default -> System.out.println("false");
}

}
}

Select 1 option(s)

false

true
false

Exception at run time.

Compilation error at line marked //1.

Compilation error at line marked //2.

Compilation error at line marked //3.

None

37. 

Question: Given the following code fragment:

var raf = new RandomAccessFile("c:\\temp\\test.txt", "rwd");

//INSERT CODE HERE

raf.close();

var dis = new DataInputStream(new FileInputStream("c:\\temp\\test.txt"));
String value = dis.readUTF();
System.out.print(value);
dis.close();

Which of the following options can be inserted in the above code so that it will print hello world?

Select 1 option(s)

raf.writeString("hello world");

raf.writeChars("hello world");

raf.writeUTF("hello world");

raf.writeData("hello world");

None

38. 

Question: Consider the following piece of code, which is run in an environment where the default locale is English - US:

Locale.setDefault(new Locale("fr", "CA")); //Set default to French Canada
Locale l = new Locale("jp", "JP");
ResourceBundle rb = ResourceBundle.getBundle("appmessages", l);
String msg = rb.getString("greetings");
System.out.println(msg);

You have created two resource bundles for appmessages, with the following contents:

#In English US resource bundle file
greetings=Hello

#In French CA resource bundle file
greetings=bonjour

What will be the output?

Select 1 option(s)

Hello

bonjour

An exception at run time.

No message will be printed.

None

39. 

Question: What changes can be made to the following code so that it will print :

Old Rating A
New Rating R


List ratings = Arrays.asList('U', 'R', 'A');
ratings.stream()
.filter(x->x=='A') //1
.peek(x->System.out.println("Old Rating "+x)) //2
.map(x->x=='A'?'R':x) //3
.peek(x->System.out.println("New Rating "+x)); //4

Select 1 option(s)

None

40. 

Question: How can you initialize a StringBuilder to have a capacity of at least 100 characters?

Select 2 option(s)

StringBuilder sb = new StringBuilder(100);

StringBuilder sb = StringBuilder.getInstance(100);

StringBuilder sb = new StringBuilder();
sb.setCapacity(100);

StringBuilder sb = new StringBuilder();
sb.ensureCapacity(100);

41. 

Question: Which of the following texts can occur in a valid resource bundle file?

Select 2 option(s)

greetings=bonjour

< key name="greetings" >bonjour< /key >

< key name="greetings" value="bonjour" / >

< key >
< name >greetings< /name >
< value >bonjour"< /value >
< /key >

< key>greetings</key >
< value>bonjour</value >

greetings1=bonjour
greetings2=no bonjour

greetings1=bonjour,greetings2=no bonjour

42. 

Question: Identify correct option(s):

Select 2 option(s)

Multiple inheritance of state includes ability to inherit instance methods from multiple classes.

Multiple inheritance of state includes ability to inherit instance fields from multiple classes.

Multiple inheritance of type includes ability to inherit instance fields as well as instance methods from multiple classes.

Multiple inheritance of type includes ability to implement multiple interfaces and ability to inherit static or instance fields from interfaces and/or classes.

Multiple inheritance of type includes ability to implement multiple interfaces and/or ability to extend from multiple classes.

43. 

Question: Which of the following are valid code fragments:

Select 2 option(s)

new Object[]{ "aaa", new Object(), new ArrayList(), 10};

new Object[]{ "aaa", new Object(), new ArrayList(), {} };

new Object[]{ "aaa", new Object(), new ArrayList(), new String[]{""} };

new Object[1]{ new Object() };

44. 

Question: Assuming that a valid integer will be passed in the command line as first argument, which statements regarding the following code are correct?

public class TestClass{
public static void main(String args[]){
var x = Integer.parseInt(args[0]);
switch(x){
case x < 5 : System.out.println("BIG"); break;
case x > 5 : System.out.println("SMALL");
default : System.out.println("CORRECT"); break;
}
}
}

Select 1 option(s)

BIG will never be followed by SMALL.

SMALL will never follow anything else.

SMALL will always be followed by CORRECT.

It will not compile.

It will throw an exception at runtime.

None

45. 

Question: Given:

List names = Arrays.asList(1, 2, 3);

How many of the following lines will print exactly 6?

1. System.out.println(names.stream().mapToInt(x->x).sum());

2. System.out.println(names.stream().forEach((sum, x)->sum = sum + x));

3. System.out.println(names.stream().reduce(0, (a, b)->a+b));

4. System.out.println(names.stream().collect(
Collectors.mapping(x->x, Collectors.summarizingInt(x->x))).getSum());

5. System.out.println(names.stream().collect(Collectors.summarizingInt(x->x)).getSum());

Select 1 option(s)

1

2

3

4

5

None

46. 

Question: Which of these are NOT legal declarations within a class?

Select 1 option(s)

static int sa ;

final Object[ ] objArr = { null } ;

abstract int t ;

abstract void format( ) ;

final static private double PI = 3.14159265358979323846 ;

None

47. 

Question: You are creating an inventory module. This module contains a com.inventory.Queries class that uses a com.acme.DB class. This com.acme.DB class is contained in acme.db module. Which of the following files correctly defines the inventory module?

Select 1 option(s)

module inventory{
requires com.acme.db.*;
}

module inventory{
requires acme.db;
}

module inventory{
requires acme.db/com.acme.DB;
}

module inventory{
uses com.acme.DB;
}

module inventory{
requires com.acme.DB;
}

module inventory{
requires com.acme.DB transitively;
}

None

48. 

Question: What will be the result of trying to compile and execute the following program?

public class TestClass{
public static void main(String args[] ){
var i = 0 ;
int[] iA = {10, 20} ;
iA[i] = i = 30 ;
System.out.println(""+ iA[ 0 ] + " " + iA[ 1 ] + " "+i) ;
}
}

Select 1 option(s)

It will throw ArrayIndexOutOfBoundsException at Runtime.

Compile time Error.

It will print 10 20 30

It will print 30 20 30

It will print 0 20 30

None

49. 

Question: Which of the following statements will compile without any error?

Select 3 option(s)

List< ? super Float > a = new ArrayList< Float >();

List< ? super Float > b = new ArrayList< Double >();

List< ? super Number > c = new ArrayList< Integer >();

List< ? extends Number > d = new ArrayList< Number >();

List< ? extends Number > e = new ArrayList< Float >();

List< ? extends Number > f = new ArrayList< Object >();

50. 

Question: Given:

LocalDate d1 = LocalDate.parse("2022-02-05", DateTimeFormatter.ISO_DATE);
LocalDate d2 = LocalDate.of(2022, 2, 5);
LocalDate d3 = LocalDate.now();
System.out.println(d1);
System.out.println(d2);
System.out.println(d3);

Assuming that the current date on the system is 5th Feb, 2022, which of the following will be a part of the output?

Select 1 option(s)

5th Feb, 2022

2022-02-05T00:00:00

02/05/2022

05/02/2022

java.time.format.DateTimeParseException

None of the above.

None

51. 

Question: Identify correct statements about the following code:

class Writer{
private static final int LOOPSIZE = 5;
public synchronized void write(Data... da){
for(int i=0; i<LOOPSIZE; i++){
while(!da[0].own(this));
while(!da[1].own(this));
da[0].write(i); da[1].write(i);
da[1].release();
da[0].release();
}
}
}
class Data{
Writer writer; int id;
public Data(int id){ this.id = id; }
public synchronized boolean own(Writer w){
if(writer == null){
writer = w; return true;
}
else return false;
}
public synchronized void release(){ writer = null; }
public void write(int i){
System.out.println("data written W"+i+" D"+id);
}
}
public class TestClass {
public static void main(String[] args) {
var w1 = new Writer();
var w2 = new Writer();
var d1 = new Data(1);
var d2 = new Data(2);
new Thread(()->{w1.write(d1, d2);}).start();
new Thread(()->{w2.write(d1, d2);}).start();
}
}

Select 1 option(s)

It is subject to a deadlock.

It is subject to a livelock.

This code will compile and run fine.

This code will not compile.

It will throw an IllegalMonitorStateException at run time.

None

52. 

Question: What will the following program print?

class Test{
public static void main(String args[]){
int var = 20, i=0;
do{
while(true){
if( i++ > var) break;
}
}while(i<var--);
System.out.println(var);
}
}

Select 1 option(s)

19

20

21

22

It will enter an infinite loop.

It will not compile due to the variable named var.

None

53. 

Question: Which of the following interface definitions can be implemented using Lambda expressions?

@FunctionalInterface
interface A{
static void m1(){};
}

interface AA extends A{
void m2();
private void mp(){ }
}

interface AAA extends AA{
void m3();
}

interface B {
default void m1(){ }
}
interface BB extends B {
static void m2(){ };
}
interface C extends BB{
void m3();
}

Select 2 option(s)

A

AA

AAA

B

BB

C

54. 

Question: Given:

What will be the result?

Select 1 option(s)

An exception will be thrown at //1

An exception will be thrown at //2

It will print two lines:
1
1
and it will insert two rows with the following values in the USERINFO table:
1, Ally A, 101 main str
2, Bob B, null

It will print two lines:
1
1 and it will insert two rows with the following values in the USERINFO table:
1, Ally A, 101 main str
2, Bob B, 101 main str

It will print one line:
1
It will insert one row with the following values in the USERINFO table:
1, Ally A, 101 main str
and an exception will be thrown at //2.

It will print two lines:
true
true
and it will insert two rows with the following values in the USERINFO table:
1, Ally A, 101 main str
2, Bob B, 101 main str

It will print one line:
true
It will insert one row with the following values in the USERINFO table:
1, Ally A, 101 main str
and an exception will be thrown at //2.

None

55. 

Question: Given the following RDBMS table information:

STUDENT Table
SID INT Primary Key
NAME VARCHAR(50)
GPA INT

and the following code:

Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select SID, NAME, GPA from STUDENT");
while(rs.next()){
System.out.println( INSERT CODE HERE );
}
connection.close();

What can be inserted in the above code so that it will print the GPA value for each student?

(Assume that items not specified such as import statements and try/catch block are all valid.)

Select 2 option(s)

rs.getString(2)

rs.getString(3)

rs.getInt(2)

rs.getInteger(2)

rs.getInt("GPA")

Time's up

Time is Up!

[/ppwp]