Online 1Z0-829 Practice Test

Question 1

Question ID: UK8297797

Given code:

package com.examtest.ocp;

import java.util.ArrayList;

import java.util.List;

public class Test {

public static void main(String[] args) {

var list = new ArrayList<String>(); //Line n1

list.add("A");

list.add("M");

var list_of_list = List.of(list); //Line n2

list_of_list.get(0).set(1, "N"); //Line n3

list_of_list.get(0).forEach(System.out::print); //Line n4

}

What is the result?

Options :

A : Compilation error at Line n2

B : An exception is thrown by Line n3

C :

AM

D : AN

Answer: D

Question 2

Question ID: UK8295509

Given code of Test.java file:

package com.examtest.ocp;

public class Test {

public static void main(String[] args) {

String arr1 [], arr2, arr3 = null; //Line n1

arr1 = new String[2];

arr1[0] = "A";

arr1[1] = "B";

arr2 = arr3 = arr1; //Line n2

System.out.println(String.join("-", arr2)); //Line n3

}

What is the result?

Options :

A : Line n1 causes compilation error

B :

Line n2 causes compilation error

C :

Line n3 causes compilation error

D : It executes successfully and prints A-B on to the console

E : It executes successfully and prints B-A on to the console

F : It executes successfully and prints A on to the console

G : It executes successfully and prints B on to the console

Answer: B

Question 3

Question ID: UK8296388

Consider below code of Test.java file:

package com.examtest.ocp;

public class Test {

public static void main(String[] args) {

final var str = "+";

System.out.println(str.repeat(2) == "++");

}

What is the result?

Options :

A : true

B : false

C : +

D : ++

Answer: B

Question 4

Question ID: UK8296889

Given code of Test.java file:

package com.examtest.ocp;

class GrandParent {}

class Parent extends GrandParent {}

class Child extends Parent {}

class GrandChild extends Child {}

public class Test {

public static void main(String... args) {

GrandParent obj = new Child();

if(!(obj instanceof GrandChild gc)) {

System.out.print("Not a GrandChild");

/*INSERT-1*/

}

/*INSERT-2*/

System.out.println(gc); //Line n2

}

And the statements:

1. Above code causes compilation error

2. Above code compiles successfully and prints: Not a GrandChild

3. To resolve compilation error, replace /*INSERT-1*/ with return;

4. To resolve compilation error, replace /*INSERT-2*/ with else

How many of the above statements is/are correct?

Options :

A : Only one statement

B :

Only two statements

C : Only three statements

D : None of the statements

Answer: C

Question 5

Given:

Which two method invocation execute?

Options :

A : IFace myclassobj = new Myc ();

myclassObj.m3 ();

B : Ifnce.m3 ();

C : iFace mucloassObj = new Myc ();

myClassObj.m4();

D : new MyC() .m2 ();

E : IFace .,4():

F : IFace.m2();

Answer: D,E

EXPERTY DESIGNED 1Z0-829 PRACTICE TEST