Java Introduction

Which component is used to compile, debug and execute java program?

• JVM

• JDK

• JIT

• JRE

.Which component is responsible to optimize bytecode to machine code?

• JDK

• JRE

• JIT

• JVM

Which of the below is invalid identifier with the main method?

• public

• final

• static

• private

What is the extension of compiled java classes?

• .class

• .java

• .pdf

• .txt

Which of these have highest precedence?

• ( )

• ++

• *

• ^

What is the order of precedence (highest to lowest) of following operators?

1.&

2.^

3.?:

• 1>2>3

• 3>2>1

• 2>3>1

• 2>1>3

  class operators  {

 public static void main(String args[])

        {             int var1 = 5;

              int var2 = 6;

              int var3;

 var3 = ++ var2 * var1 / var2 + var2;

          System.out.print(var3);

       }

}

• 10

• 11

• 12

• 56

. Which of these is not a bitwise operator?

• &

• !=

• |=

• ^=

What will be the output of the following Java program?

class leftshift_operator

 {

       public static void main(String args[])

      {       

            byte x = 64;

             int i;

          byte y;

            i = x << 2;

             y = (byte) (x << 2)

           System.out.print(i + " " + y);

      }

   }

• 0 64

• 0 256

• 64 0

• 256 0

What will be the output of the following Java program?

1.  class Output

2.      {

3.          public static void main(String args[])

4.          {   

5.               int a = 1;

6.               int b = 2;

7.               int c = 3;

8.               a |= 4;

9.               b >>= 1;

10.             c <<= 1;

11.             a ^= c;

12.             System.out.println(a + " " + b + " " + c);

13.        }

14.    }

• 2 2 3

• 3 1 6

• 2 3 4

• 3 3 6