Which of these method return a pseudorandom number?

which of these methods is a rounding function of math class 

Which of these methods deletes all the elements from the invoking collection?

Predict the output of the following Java code that uses a HashSet.

Predict the output of the following Java code:

public class Output {

   public static void main(String[] args) {

      int x = 5;

      int y = 7;

      int z = x++ * ++y;

      System.out.print(z);

   }

}

class test {

public static void main (String[] args) {

  int x,y=10;

       x=5;

       {

            y=6;

            System.out.println(++x+" "+y);

       }

       System.out.println(x+" "+y);

}

}

Which of   the following is not true?

How to get the difference between 2 dates in Java?

Select the correct option for the following Java code.

class Abekus {

public static void main(String[] args)

{

byte a = 20;

byte b = 30;

int c = a + b; // line 5

byte d = b - a; // line 6

System.out.println(c);

System.out.println(d);

}

}

Predict the output of the following Java code:

import java.lang.*;

public class Abekus {

public static void main(String[] args)

{

short s = 345;

Short s_ = new Short(s);

System.out.println(s_.getClass().getName());

System.out.println(s_.toString().getClass().getName());

}

}