JAVA Quiz- Online MCQ Test

1)Which of the following lines will compile without warning or error. *

1) float f=1.3; 2) char c= 2.58; 3) byte b=257; 4) boolean b=null; 5) int i=10;

2)What will happen if you try to compile and run the following code ?

public class MyClass {
public static void main(String arguments[]){ amethod(arguments); }
public void amethod(String[] arguments) {
System.out.println(arguments);
System.out.println(arguments[1]);
}
}
*

error Can't make static reference to void amethod. error method main not correct error array must include parameter amethod must be declared with String

3)What will happen if you try to compile and run the following code ? *

-128 to 127 (-2 power 8 )-1 to 2 power 8 -255 to 256 depends on the particular implementation of the Java Virtual machine

4) What will be printed out if this code is run with the following command line?

java myprog good morning public class myprog{ public static void main(String argv[]) { System.out.println(argv[2]); } }
*

myprog good morning Exception raised: 'java.lang.ArrayIndexOutOfBoundsException: 2'

5) Which of the following is NOT a keywords or reserved words in Java? *

if then goto while case

6 )What will happen if you try to compile and run the following code?

public class Q { public static void main(String argv[]){ int anar[]=new int[]{1,2,3}; System.out.println(anar[1]); } }
*

1 Error anar is referenced before it is initialized 2 Error: size of array must be defined

7) What will be printed out if you attempt to compile and run the following code?

int i=9; switch (i) { default: System.out.println("default"); case 0: System.out.println("zero"); break; case 1: System.out.println("one"); case 2: System.out.println("two"); }
*

default default,zero error default clause not defined no output displayed

8) What will happen if you attempt to compile and run the following code?

class Base {} class Sub extends Base {} class Sub2 extends Base {} public class CEx{ public static void main(String argv[]){ Base b=new Base(); Sub s=(Sub) b; } }
*

Compile and run without error Compile time Exception Runtime Exception

9)What will happen when you attempt to compile and run the following code?

public class Tux extends Thread{ static String sName = "vandeleur"; public static void main(String argv[]){ Tux t = new Tux(); t.piggy(sName); System.out.println(sName); } public void piggy(String sName){ sName = sName + " wiggy"; start(); } public void run(){ for(int i=0;i < 4; i++){ sName = sName + " " + i; } } }
*

Compile time error Compilation and output of 'vandeleur wiggy' Compilation and output of 'vandeleur wiggy 0 1 2 3' Compilation and output of either 'vandeleur', 'vandeleur 0', 'vandeleur 0 1' 'vandaleur 0 1 2' or 'vandaleur 0 1 2 3'

10) What will be output by the following code?

public class MyFor{ public static void main(String argv[]){ int i; int j; outer: for (i=1;i
*

Value for i=1 Value for j=1 Value for i=3 Value for j=1 Value for i=2 Value for j=1
Should be Empty: