Java standard test 9 Code 1Z 829

Question: Identify correct statements about the following code:

public class Counter{ //1
T t;
public int count(T[] ta, T t){ //2
this.t = t; //3
int count = 0;
for(T x : ta){
count = x == t ? count+1: count;//4
}
return count;
}
}

Select 1 option(s)

Question: You are creating a abc.payroll module that makes its two classes - com.abc.payroll.Hourly and com.abc.payroll.Yearly - available to all other modules for use.

Which of the following files correctly defines this module?

Select 1 option(s)

Question: Consider these two interfaces:

interface I1
{
void m1() throws java.io.IOException;
}
interface I2
{
void m1() throws java.sql.SQLException;
}

What methods have to be implemented by a class that says it implements I1 and I2 ?

Select 1 option(s)

Question: Given:

public static boolean getBool(){
return true;
}
public static String getString(){
return "true";
}
public static void main(String args[]){
switch( getBool() ){
case true -> System.out.println("true");
default -> System.out.println("none");
}
}

What changes can be done so that it will print only true?

Select 1 option(s)

Question: Your are modularizing your java application but it depends on commons-dbcp-0.9.jar, which is not modularized. So, you have decided to put this jar on the module-path. What module name will be given to the automatic module created for this jar?

Select 1 option(s)

Question: What will be the result when you try to compile and run the following code?

public class TestClass
{
public static void main(String args[] )
{
var out = new Outer();
System.out.println(out.getInner().getOi());
}
}
class Outer
{
private int oi = 20;
class Inner
{
int getOi() { return oi; }
}
Inner getInner() { return new Inner() ; }
}

Select 1 option(s)

Question: What will be the output of the following class.

class Test{
public static void main(String[] args){
int j = 1;
try{
int i = doIt() / (j = 2);
} catch (Exception e){
System.out.println(" j = " + j);
}
}
public static int doIt() throws Exception { throw new Exception("FORGET IT"); }
}

Select 1 option(s)

Question: Consider the following interface definition:

interface Measurement{
public default int getLength(){
System.out.println("getting length");
return 10;
};
public default int getBreadth(){
System.out.println("getting length");
return 20;
};
}

Several similar default methods need to be added to this interface and each method is supposed to log a message at the start of the method. As of now, the logging is done using just a println statement but it may change later.

What changes can be done in the above interface to make it more maintainable without exposing any non-business functionality to the users of this interface?

Select 1 option(s)

Question: Consider the following classes:

class Boo {
public Boo(){ System.out.println("In Boo"); }
}
class BooBoo extends Boo {
public BooBoo(){ System.out.println("In BooBoo"); }
}

class Moo extends BooBoo implements Serializable {
int moo = 10; { System.out.println("moo set to 10"); }
public Moo(){ System.out.println("In Moo"); }
}

First, the following code was executed and the file moo1.ser was created successfully:

Moo moo = new Moo();
moo.moo = 20;
FileOutputStream fos = new FileOutputStream("c:\\temp\\moo1.ser");
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(moo);
os.close();

Next, the following code was executed.

FileInputStream fis = new FileInputStream("c:\\temp\\moo1.ser");
ObjectInputStream is = new ObjectInputStream(fis);
Moo moo = (Moo) is.readObject();
is.close();
System.out.println(moo.moo);

Which of the following will be a part of the output of the second piece of code?

Select 3 option(s)

Question: What can be inserted in the code below so that it will print true when run?

public class TestClass{

public static boolean checkList(List list, Predicate p){
return p.test(list);
}

public static void main(String[] args) {
boolean b = //WRITE CODE HERE
System.out.println(b);
}
}

Select 2 option(s)

Question: Consider the following method -

public float parseFloat( String s ){
float f = 0.0f;
try{
f = Float.valueOf( s ).floatValue();
return f ;
}
catch(NumberFormatException nfe){
f = Float.NaN ;
return f;
}
finally{
f = 10.0f;
return f;
}
}

What will it return if the method is called with the input "0.0" ?

Select 1 option(s)

Question: Given:

class Automobile{
final String getVin(){ return "1234"; }
}

Identify correct statements.

Select 1 option(s)

Question: Consider the following class definition:

public class TestClass{
public static void main(String[] args){ new TestClass().sayHello(); } //1
public static void sayHello(){ System.out.println("Static Hello World"); } //2
public void sayHello() { System.out.println("Hello World "); } //3
}

What will be the result of compiling and running the class?

Select 1 option(s)

Question: Add description herGiven:

import java.io.*;
class TestClass{
public static void main(String[] args) throws Exception{
try(var bfr = new BufferedReader(new InputStreamReader(System.in))){
System.out.println("Enter Number:");
var s = bfr.readLine();
System.out.println("Your Number is : "+s);
}catch(Exception e){
e.printStackTrace();
}
}
}

What will be the output if the above code is executed using the following command:
java TestClass 123

Select 1 option(s)

Question: NOTE: Although Class.isArray() and Object.clone() methods are not officially on the exam, you may still see a question or two in the exam that requires you to know about these methods.

Given the following declaration:

int[][] twoD = { { 1, 2, 3} , { 4, 5, 6, 7}, { 8, 9, 10 } };

What will the following lines of code print?

System.out.print(twoD[1].length);
System.out.print(twoD[2].getClass().isArray());
System.out.print(twoD[1][2]);
System.out.print(twoD[0] == twoD.clone()[0]);

Select 1 option(s)

Question: For what command line arguments will the following program print true?

class TestClass{

public static void main(String[] args){
Integer i = Integer.parseInt(args[0]);
Integer j = i;
i--;
i++;
System.out.println((i==j));

}
}

Select 3 option(s)

Question: Given:

In file A.java:

package p1;
import java.util.*;
public class A {
public String name = "A";
protected A(){ }
}

In file B.java:

package p2;
import p1.*;
public class B extends A{
public String name = "B";
public B(){ super(); }
}

In file TestClass.java:

import p1.*;
import p2.*;

public class TestClass
{
public static void main(String[] args) {
A a = new B();
System.out.println(a.name);
}
}

What will be the result of compiling and executing Testclass?

Select 1 option(s)

Question: Given:

BiFunction bf
= (String s, Integer i) -> { return s.substring(0, i); };

What of the following lambda expressions is equivalent to the one used above?

Select 1 option(s)

Question: What will the following code print when run?

import java.util.function.Predicate;
class Employee{
int age; //1
}

public class TestClass{

public static boolean validateEmployee(Employee e, Predicate p){
return p.test(e);
}

public static void main(String[] args) {
Employee e = new Employee(); //2
System.out.println(validateEmployee(e, e->e.age<10000)); //3
}
}

Select 1 option(s)

Question: Given:

interface I { }

class A implements I{
public String toString(){ return "in a"; }
}

class B extends A{
public String toString(){ return "in b"; }
}


public class TestClass {

public static void main(String[] args) {
B b = new B();
A a = b;
I i = a;

System.out.println(i);
System.out.println((B)a);
System.out.println(b);

}
}

What will be printed when the above code is compiled and run?

Select 1 option(s)

Question: Given:

var nums = IntStream.range(1, 5);

Which of the following options will compute the average of the numbers in the nums stream?

Select 3 option(s)

Question: Consider the following code:

public class FileCopier {
public static void copy(String records1, String records2) {
try {
InputStream is = new FileInputStream(records1);
OutputStream os = new FileOutputStream(records2);
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);
}
} catch (FileNotFoundException | IndexOutOfBoundsException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
copy("c:\\temp\\test1.txt", "c:\\temp\\test2.txt");
}
}

Assuming appropriate import statements and the existence of both the files, what will happen when the program is compiled and run?

Select 1 option(s)

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

int[][] ab = { {1, 2, 3}, {4, 5} };
for(var i=0; i<ab.length; i++){
for(var j=0; j<ab[i].length; j++){
System.out.print(ab[i][j]+" ");
if(ab[i][j] == 2){
break;
}
}
continue;
}

Select 1 option(s)

Question: Given:

Stream names = Stream.of("Sarah Adams", "Suzy Pinnell", "Paul Basgall");
Stream firstNames = //INSERT CODE HERE

Which of the following options will correctly assign a stream of just first names to firstNames?

Select 1 option(s)

Question: Which of the following statements can be inserted at // 1 to make the code compile without errors?

public class InitTest{
static int si = 10;
int i;
final boolean bool;
// 1
}

Select 1 option(s)

Question: What will the following code print when run?

public class Noobs {
public void m(int a){
System.out.println("In int ");
}
public void m(char c){
System.out.println("In char ");
}
public static void main(String[] args) {
Noobs n = new Noobs();
int a = 'a';
char c = 6;
n.m(a);
n.m(c);
}
}

Select 1 option(s)

Question: Which of the following sets of interface definitions are valid?

Select 1 option(s)

Question: What will the following code print when run?

public class Test {

static String s = "";

public static void m0(int a, int b) {
s += a;
m2();
m1(b);
}

public static void m1(int i) {
s += i;
}

public static void m2() {
throw new NullPointerException("aa");
}

public static void m() {
m0(1, 2);
m1(3);
}

public static void main(String args[]) {
try {
m();
} catch (Exception e) {
}
System.out.println(s);
}
}

Select 1 option(s)

Question: The following is a partial code listing from an application:

rs.moveToInsertRow();
rs.updateString(1, "111");
rs.updateString(2, "Java in 24 hours");

//INSERT CODE HERE

Assuming that rs is a valid reference to an updatable ResultSet and that the result set contains only two String columns, what can be inserted in the code so that a new row is inserted in the database?

Select 1 option(s)

Question: Given:

Path p1 = Paths.get("c:\\a\\b\\c.java");

What will p1.getName(2).toString() return?

Select 1 option(s)

Question: Given :

1. The time zone of America/New York is normally 5 hours behind UTC.
2. Day light saving is ON during June in New York. (This means, clocks in New York are 1 hour ahead of the regular time that would have been shown when day light saving is OFF.)

What will the following code print when compiled and run?

LocalDateTime ldt = LocalDateTime.of(2022, 06, 02, 6, 0, 0); //Jun 2nd, 6AM.
ZoneOffset nyOffset = ZoneOffset.ofHoursMinutes(-5, 0);
ZoneId nyZone = ZoneId.of("America/New_York");
OffsetDateTime nyOdt = ldt.atOffset(nyOffset);
ZonedDateTime nyZdt = ldt.atZone(nyZone);
Duration d = Duration.between(nyOdt, nyZdt);
System.out.println(d);

Select 1 option(s)

Question: What will be the output of the following code snippet:

Stream ss = Stream.of("a", "b", "c", "d", "e");
Spliterator sit1 = ss.spliterator();
long s0 = sit1.estimateSize();
Spliterator sit2 = sit1.trySplit();
long s1 = sit1.estimateSize();
long s2 = sit2.estimateSize();

System.out.println( s0 - (s1+s2) );

Select 1 option(s)

Question: Consider the following class:

public class PortConnector{
public PortConnector(int port) throws IOException{
...lot of valid code.
}
...other valid code.
}

You want to write another class CleanConnector that extends from PortConnector. Which of the following statements should hold true for CleanConnector class?

Select 1 option(s)

Question: Given:

public class Counter{
static AtomicInteger ai = new AtomicInteger(0);
public static void increment(){
//1
}
//other valid code
}

This class is supposed to keep an accurate count for the number of times the increment method is called. Several classes share this class and call its increment method. What should be inserted at //1 ?

Select 2 option(s)

Question: Which statements can be inserted at line 1 in the following code to make the program write x on the standard output when run?

public class AccessTest{
String a = "x";
static char b = 'x';
String c = "x";
class Inner{
String a = "y";
String get(){
String c = "temp";
// Line 1
return c;
}
}

AccessTest() {
System.out.println( new Inner().get() );
}

public static void main(String args[]) { new AccessTest(); }
}

Select 3 option(s)

Question: Given the following code:

class TestClass{
public static void main(String args[]){
int time = 100;
java.sql.Timestamp ts = new java.sql.Timestamp(time);
java.util.Date d = new java.util.Date();
ts = new java.sql.Timestamp(d.getTime());
System.out.println(ts);
}
}

and the following commands:

javac TestClass.java
jdeps -summary TestClass.class

What will be the output?

Select 1 option(s)

Question: Given:

HashMap hm = new HashMap();
hm.put(1, "a"); hm.put(2, "b"); hm.put(3, "c");

Which of the following statements will print the keys as well as values contained in the map?

Select 1 option(s)

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

public class Test{
static int a = 0;
int b = 5;

public void foo(){
while(b>0){
b--;
a++;
}
}

public static void main(String[] args) {
var p1 = new Test();
p1.foo();
var p2 = new Test();
p2.foo();

System.out.println(p1.a+" "+p2.a);
}
}

Select 1 option(s)

Question: Given:

public class TableTest {
static String[][] table;
public static void main(String[] args) {
String[] x = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
String[] y1 = { "1", "2", "3", "4", "5" };
String[] y2 = { "a", "b", "c" };

table = new String[3][];
table[0] = x;
table[1] = y1;
table[2] = y2;

//INSERT CODE HERE

}
}

What can be inserted in the above code to make it print Sun5c?

Select 1 option(s)

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

public class TestClass{
public static void main(String[] args) {
int value = 0;
Supplier valueS = ()->value++; //1
value++;//2
System.out.println(value+" "+valueS.get()); //3
}
}

Select 1 option(s)

Question: Consider the following class :

public class Test{
public static void main(String[] args){
if (args[0].equals("open"))
if (args[1].equals("someone"))
System.out.println("Hello!");
else System.out.println("Go away "+ args[1]);
}
}

Which of the following statements are true if the above program is run with the command line :
java Test closed

Select 1 option(s)

Question: Which lines contain a valid constructor in the following code?

public class TestClass{
public TestClass(int a, int b) { } // 1
public void TestClass(int a) { } // 2
public TestClass(String s); // 3
private TestClass(String s, int a) { } //4
public TestClass(String s1, String s2) { }; //5
}

Select 3 option(s)

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

Select 1 option(s)

Question: What will be the output of the following code:

Stream ss = Stream.of("a", "b", "a", "b", "c", "b");
Map data = ss.collect( Collectors.groupingBy(Function.identity(),
Collectors.counting()));
System.out.println( data );

Select 1 option(s)

Question: Given the following pairs of method declarations, which of the statements are true?

1.
void perform_work(int time){ }
int perform_work(int time, int speed){ return time*speed ;}

2.
void perform_work(int time){ }
int perform_work(int speed){return speed ;}

3.
void perform_work(int time){ }
void Perform_work(int time){ }

Select 2 option(s)

Question: You have a collection which contains objects of a class X. When the collection is sorted using Collections.sort(collectionOfX);, X's compareTo() method is used. Which of the following statements are correct about this class X?

Select 2 option(s)

Question: Given:

public class Bandwidth{
public int available = 0;
public int getAvailable(){
return available;
}
public Bandwidth(int quota){
this.available = quota;
}
public void addMore(int more){
available += more;
}

}
and a piece of code from another class:
Bandwidth bw = new Bandwidth(100);
//INSERT CODE HERE
System.out.println(bw.getAvailable());

What can be inserted in the code above so that it will print 0?

Select 2 option(s)

Question: Given that SomeException is a checked exception, consider the following code:

//in file A.java
public class A{
protected void m() throws SomeException{}
}

//in file B.java
public class B extends A{
public void m(){ }
}

//in file TestClass.java
public class TestClass{
public static void main(String[] args){
//insert code here. //1
}
}

Which of the following options can be inserted at //1 without resulting in any compilation or runtime errors?

Select 1 option(s)

Question: Assuming that Book has appropriate constructor and accessor methods, what will the following code print?

List books = Arrays.asList(
new Book("Freedom at Midnight", 5.0),
new Book("Gone with the wind", 5.0),
new Book("Midnight Cowboy", 15.0)
);

books.stream()
.filter(b->b.getTitle().startsWith("F"))
.forEach(b->b.setPrice(10.0));
books.stream()
.forEach(b->System.out.println(b.getTitle()+":"+b.getPrice()));

Select 1 option(s)

Question: Consider the following two classes (in the same package but defined in different source files):

public class Square {
double side = 0;
double area;

public Square(double length){ this.side = length; }

public double getSide() { return side; }

public void setSide(double side) { this.side = side; }

double getArea() { return area; }
}
public class TestClass {
public static void main(String[] args) throws Exception {
Square sq = new Square(10.0);
sq.area = sq.getSide()*sq.getSide();
System.out.println(sq.getArea());
}
}

You are assigned the task of refactoring the Square class to make it better in terms of encapsulation. What changes will you make to this class?

Select 4 option(s)

Question: Encapsulation ensures that ...

Select 1 option(s)

Question: Which of the following commands can be used to identify class and module dependencies of a class named test.A of module named moduleA without executing it?

Assume that all module files are stored in out directory.
Note: Although identifying module dependency is not explicitly mentioned in the exam objectives, we have seen questions on the exam that require you to know about the tool that is used to identify module dependencies.

Select 1 option(s)

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

public class ATest {

String global = "111";

public int parse(String arg){
var value = 0;
try{
String global = arg;
value = Integer.parseInt(global);
}
catch(Exception e){
System.out.println(e.getClass());
}
System.out.print(global+" "+value+" ");
return value;
}
public static void main(String[] args) {
ATest ct = new ATest();
System.out.print(ct.parse("333"));
}
}

Select 1 option(s)

Question: Consider the following code:

import java.io.*;
public class TestClass {

public static void main(String[] args) throws Exception {
var f = new File("x"); //1
var bfr1 = new BufferedReader(new FileReader(f)); //2
var bfr2 = new BufferedReader( bfr1 ); //3
var pw = new PrintWriter(new FileReader(f)); //4
}
}

Select the correct statements about the above program.

Select 1 option(s)

Question: Consider the following code:

public static void findFiles() throws Exception{
Path dir = Paths.get("c:\\temp");

//INSERT CODE HERE
for(Path p : ds){
System.out.println(p);
}
}
catch(Exception e){
e.printStackTrace();
}
}

What should be inserted in the above code so that it will print all the files with extension gif and jpeg?

Select 1 option(s)