StringBuilder is slower as compare to StringBuffer

What is the value stored in x in the following lines of Java code?

int x, y, z;
x = 0;
y = 1;
x = y = z = 8;

Which of the following method set the out stream to OutputStream?

class test{

public static void main (String[] args) {

   System.out.println((7&8)+" "+(7|8));

}

}

public class outputs 

    {

        public static void main(String args[]) 

        {

            int a=10;

int b=20;

int c=15;

int sum=0;

sum= (a%b%c)%10;

System.out.println(sum);

        } 

    }

class test{

public static void main (String[] args) {

   int a=7;

   int b=15;

   a+=(~b);

   if(false)

   {

       System.out.println(~a);

   }

   else

   {

       System.out.println(b);    

   }

}

}

JVM(Java Virtual Machine) include class library files. True or False?

Predict the output of the following Java code.

class Abekus { 

public static void main(String[] args) 

{ 

try { 

System.out.println(5/0); 

} 

catch(Exception e)  { 

System.out.println("Abekus"); 

} 

catch(ArithmeticException e) { 

System.out.println("Hello"); 

} 

} 

} 

In the following Java code, which code fragment should be inserted at line 3 so that the output will be: "123abc 123abc"?

StringBuilder sb1 = new StringBuilder("123");
2. String s1 = "123";
3. sb1.append("abc"); s1 = s1.concat("abc");
4. System.out.println(sb1 + " " + s1);

What is the output of the following program?

class Volume

    {

        int width;

        int height;

        int length;

        int volume;

        void vol(int height, int length, int width) 

        {

             volume = width*height*length;

        } 

    }    

    class A

    {

        public static void main(String args[])

        {

            Volume v = new Volume();

            v.height = 1;

            v.length = 2;

            v.width = 3;

            v.vol(1,2,5);

            System.out.println(v.volume);        

        } 

     }