JAVA QUIZ

1. public class Foo {

2. public static void main(String[] args) {

3. try {

4. return;

5. } finally {

6. System.out.println( "Finally" );

7. }

8. }

9. }

ClassOne.java:

1. package com.abe.pkg1;

2. public class ClassOne {

3. private char var = 'a';

4. char getVar() { return var; }

5. }

ClassTest.java:

1. package com.abe.pkg2;

2. import com.abc.pkg1.ClassOne;

3. public class ClassTest extends ClassOne {

4. public static void main(String[] args) {

5. char a = new ClassOne().getVar();

6. char b = new ClassTest().getVar();

7. }

8. }

 

1. public class Alpha1 {

2. public static void main( String[] args ) {

3. boolean flag; int i=0;

5. do {

6. flag = false;

7. System.out.println( i++ );

8. flag = i < 10;

9. continue;

10. } while ( (flag)? true:false );

11. }

12. }

1. package foo;

2.

3. import java.util.Vector;

4.

5. protected class MyVector Vector {

6. init i = 1;

7. public MyVector() {

8. i = 2;

9. }

10. }

11.

12. public class MyNewVector extends MyVector {

13. public MyNewVector() {

14. i = 4;

15. }

16. public static void main(String args[]) {

17. MyVector v = new MyNewVector();

18. }

19. }

What is the output for the below code ? 

1.         public class A {

2.         int add(int i, int j){

3.                     return i+j;

4.                     }

5.         }

6.         public class B extends A{

7.         public static void main(String argv[]){

8.         short s = 9;

9.         System.out.println(add(s,6));

10.        }

11.        }

What is the output for the below code ?

public class A {

int k;

boolean istrue;

static int p;

public void printValue() {

System.out.print(k);

System.out.print(istrue);

System.out.print(p);

}

}

public class Test{

public static void main(String argv[]){

A a = new A();

a.printValue();

}

}

What is the output for the below code ?

public class Test{

int _$;

int $7;

int do;

public static void main(String argv[]){

Test test = new Test();

test.$7=7;

test.do=9;

System.out.println(test.$7);

System.out.println(test.do);

System.out.println(test._$);

}

}

What is the output for the below code ?

 

package com;

class Animal {

public void printName(){

System.out.println(“Animal”);

}

}

 

package exam;

import com.Animal;

public class Cat extends Animal {

public void printName(){

System.out.println(“Cat”);

}

}

 

package exam;

import com.Animal;

public class Test {

public static void main(String[] args){

Animal a = new Cat();

a.printName();

}

}

public class A {

int i = 10;

public void printValue() {

System.out.println(“Value-A”);

}

}

 

public class B extends A{

int i = 12;

public void printValue() {

System.out.print(“Value-B”);

}

}

 

public class Test{

public static void main(String argv[]){

A a = new B();

a.printValue();

System.out.println(a.i);

}

}

What is the output for the below code ?

 

public class A {

static{System.out.println(“static”);}

{ System.out.println(“block”);}

public A(){

System.out.println(“A”);

}

public static void main(String[] args){

A a = new A();

}

What is the output for the below code ?

1. public class Test {

2. public static void main(String[] args){

3. int i = 010;

4. int j = 07;

5. System.out.println(i);

6. System.out.println(j);

7. }

8. }

What is the output for the below code ?

1. public class Test {

2. public static void main(String[] args){

3. byte b = 6;

4. b+=8;

5. System.out.println(b);

6. b = b+7;

7. System.out.println(b);

8. }

9. }

What is the output for the below code ?

public class Test {

public static void main(String[] args){

String value = “abc”;

changeValue(value);

System.out.println(value);

}

public static void changeValue(String a){

a = “xyz”;

}

What is the output for the below code ?

public class Test {

public static void printValue(int i, int j, int k){

System.out.println(“int”);

}

public static void printValue(byte…b){

System.out.println(“long”);

}

public static void main(String… args) {

byte b = 9;

printValue(b,b,b);

}

}

You have a java file name Test.java inside src folder of javaproject

directory. You have also classes folder inside javaproject directory.

you have issued below command from command prompt.

cd javaproject

Which of the below command puts Test.class file inside classes folder ?

You have two class files name Test.class and Test1.class inside javaproject directory.

Test.java source code is :

 

public class Test{

public static void main (String[] args){

System.out.println(“Hello Test”);

}

}

Test1.java source code is :

public class Test1{

public static void main (String[] args){

System.out.println(“Hello Test1″);

}

}

you have issued below commands from command prompt.

cd javaproject

java Test Test1

What is the output ?

You have a java file name Test.java .

Test.java needs access to a class contained in app.jar in “exam”

directory.

Which of the follwing command set classpath to compile clean?

What will be the result of compiling the following code:

public class SuperClass {

public int doIt(String str, Integer… data)throws Exception{

String signature = “(String, Integer[])”;

System.out.println(str + ” ” + signature);

return 1;

}

}

public class SubClass extends SuperClass{

public int doIt(String str, Integer… data)

{

String signature = “(String, Integer[])”;

System.out.println(“Overridden: ” + str + ” ” +

signature);

return 0;

}

public static void main(String… args)

{

SuperClass sb = new SubClass();

sb.doIt(“hello”, 3);

}

}

What happens when the following code is compiled and run.

Select the one correct answer.

for(int i = 2; i < 4; i++)

for(int j = 2; j < 4; j++)

if(i < j)

assert i!=j : i; 

try{

File f = new File(“a.txt”);

}catch(Exception e){

}catch(IOException io){

}

Is this code create new file name a.txt ?