Interfaces and Abstract Classes
practice.

Which of these classes can schedule task for execution in future?

What will be the output of the following Java program?

class X 
{
    int a;
    double b;
}
class Y extends X 
{
int c;
}
class Output 
{
    public static void main(String args[]) 
    {
        X a = new X();
        Y b = new Y();
        Class obj;
        obj = b.getClass();
        System.out.print(obj.getSuperclass());
    }
}

What will be the output of the following Java program?

class Output 
{
     public static void main(String args[]) 
     {
         int x = 3.14;  
         int y = (int) Math.abs(x);
         System.out.print(y);
     }
}

Which of these methods is not defined in both Byte and Short wrappers?

Which of these methods is used to know whether a string contains "true"?

Which of the interface contains all the methods used for handling thread related operations in Java?

Which of these method is a rounding function of Math class?

Which of these is method for testing whether the specified element is a file or a directory?

Which of these methods calls update() method?

What will be the output of the following Java program?

class newthread implements Runnable 
{
Thread t;
    newthread() 
    {
        t = new Thread(this,"My Thread");
        t.start();
}
public void run() 
    {
  System.out.println(t.getName());
}
}
class multithreaded_programing 
{
    public static void main(String args[]) 
    {
        new newthread();        
    }
}

Which of these values are returns under the case of normal termination of a program?

What will be the output of the following Java program?

class exception_handling 
{
    public static void main(String args[]) 
    {
        try 
        {
            int a = args.length;
            int b = 10 / a;
            System.out.print(a);
            try 
            {
                 if (a == 1)
                     a = a / a - a;
                 if (a == 2) 
                 {
                     int c = {1};
                     c[8] = 9;
                 }
            }
            catch (ArrayIndexOutOfBoundException e) 
            {
                System.out.println("TypeA");
            }
            catch (ArithmeticException e) 
            {
                System.out.println("TypeB");
            }
    }
}

Note: Execution command line: $ java exception_handling one two

What will be the output of the following Java program?

interface calculate
{
    void cal(int item);
}
class display implements calculate
{
    int x;
    public void cal(int item)
    {
        x = item * item;            
    }
}
class interfaces
{
    public static void main(String args[])
    {
        display arr = new display;
        arr.x = 0;      
        arr.cal(2);
        System.out.print(arr.x);
    }
}

What does an interface contain?

Math.random() guarantees uniqueness?

What will be the output of the following Java program?

package pkg;
class output 
{
    public static void main(String args[])
    {
        StringBuffer s1 = new StringBuffer("Hello World");
        s1.insert(6 , "Good ");
        System.out.println(s1);
    }
}

Note : Output.class file is not in directory pkg.

What will be the output of the following Java program?

import java.io.*;
public class filesinputoutput 
{
  public static void main(String[] args) 
    {
 String obj  = "abc";
       byte b[] = obj.getBytes();
       ByteArrayInputStream obj1 = new ByteArrayInputStream(b);
       for (int i = 0; i < 2; ++ i) 
       {
           int c;
           while ((c = obj1.read()) != -1) 
           {
             if (i == 0) 
               {
                   System.out.print(Character.toUpperCase((char)c)); 
             }
           }
       }
    }
}

How to assign values to variable using property?

Which of these methods return string equivalent of Boolean object?

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[]) 
    {
        double x = 102;
        double y = 5;
        double z = Math.IEEEremainder(x, y);
        System.out.print(z);}
     }
}