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Oracle Java Programming Certification Questions and Answers (Dumps and Practice Questions)



Question : Given the code fragment:
String h1 = "Bob";
String h2 = new String ("Bob");
What is the best way to test that the values of h1 and h2 are the same?

: Given the code fragment:
1. if (h1 = = h2)
2. if (h1.equals(h2))
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4. if (h1.same(h2))


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Explanation: The equals method compares values for equality










Question : You have been given belwo interface declaration

interface Runnable {
public voide run();
}

Which of the following will create instance of Runnable type?

: You have been given belwo interface declaration
1. Runnable run = 0 -> {
System.out.println("Run");
}
2. Runnable run = 0 -> System.out.println("Run");
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4. Runnable run => System.out.println("Run");
5. None of above




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Question : You have been given below Java Code

public class Painting {
private String type;

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}

public static void main(String[] args) {
Painting obj1 = new Painting();
Painting obj2 = new Painting();
obj1.setType(null);
obj2.setType("Fresco");
System.out.print(obj1.getType() + " : " + obj2.getType());
}
}

When you run it, what would be printed ?


: You have been given below Java Code
1. : Fresco
2. null : Fresco
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4. A NullPointerException is thrown at runtime




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Related Questions

Question : Given the code fragment:

public class ForTest {
public static void main(String[] args) {
int[] array = { 1, 2, 3 };
for (foo) {
}
}
}

Which three code fragments, when replaced individually for foo, enables the program to compile?

A. int i : array
B. int i = 0; i < 1;
C. ; ;
D. ; i < 1; i++
E. i = 0; i<1;

 : Given the code fragment:
1. A,B,C
2. B,C,D
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4. A,D,E
5. B,C,E






Question : You have been given following code as below.

public class ComputeSum {
public int x;
public int y;
public int sum;

public ComputeSum(int nx, int ny) {
x = nx;
y = ny;
updateSum();
}

public void setX(int nx) {
x = nx;
updateSum();
}

public void setY(int ny) {
x = ny;
updateSum();
}

void updateSum() {
sum = x + y;
}
}


This class needs to protect changes on the "sum" field. Which three members must have the private access modifier to ensure that this invariant is maintained?

A. The x field
B. The y field
C. The sum field
D. The ComputerSum ( ) constructor
E. The setX ( ) method
F. The setY ( ) method

 : You have been given following code as below.
1. A,B,C
2. B,C,D
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4. A,D,E
5. C,E,F




Question : Which two statements are true?
A. An abstract class can implement an interface.
B. An abstract class can be extended by an interface.
C. An interface CANNOT be extended by another interface.
D. An interface can be extended by an abstract class.
E. An abstract class can be extended by a concrete class.
F. An abstract class CANNOT be extended by an abstract class.
 : Which two statements are true?
1. A,B
2. B,C
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4. D,F
5. A,E



Question : You have been given below code

package WQ5;

abstract class A1 {
public abstract void m1();

public void m2() {
System.out.println("Green");
}
}

abstract class A2 extends A1 {
public abstract void m3();

public void m1() {
System.out.println("Cyan");
}

public void m2() {
System.out.println("Blue");
}
}

public class A3 extends A2 {
public void m1() {
System.out.println("Yellow");
}

public void m2() {
System.out.println("Pink");
}

public void m3() {
System.out.println("Red");
}

public static void main(String[] args) {
A2 tp = new A3();
tp.m1();
tp.m2();
tp.m3();
}
}

When you run it , what would be result ?


 : You have been given below code
1. Yellow Pink Red
2. Cyan Blue Red
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4. Compilation Fails




Question : You are writing a method that is declared not to return a value. Which two are permitted in the method body?

A. omission of the return statement
B. return null;
C. return void;
D. return;



 : You are writing a method that is declared not to return a value. Which two are permitted in the method body?
1. A,B
2. A,D
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4. C,D





Question : You have been given below code

import java.util.*;

public class Ref {
public static void main(String[] args) {
StringBuilder s1 = new StringBuilder("Hello Java!");
String s2 = s1.toString();
List lst = new ArrayList();
lst.add(s2);
System.out.println(s1.getClass());
System.out.println(s2.getClass());
System.out.println(lst.getClass());
}
}

When you run it, what would be result ?


 : You have been given below code
1. class java.lang.String class java.lang.String class java.util.ArrayList
2. class java.lang.Object class java.lang. Object class java.util.Collection
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4. class java.lang.StringBuilder class java.lang.String class java.util.List