Interfaces and Abstract Classes
practice.

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 = a.getClass();
        System.out.print(obj.getName());
    }
}

Which of these is specified by a File object?

What will be the output of the following Java code?

class isinfinite_output 
{
    public static void main(String args[]) 
    {
        Double d = new Double(1 / 0.);  
        boolean x = d.isInfinite();
        System.out.print(x);
    }
}

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.isLocalClass());
    }
}

What happens when a constructor is defined for an interface?

Which of the following is an incorrect statement about packages?

Which of these data type is returned by every method of OutputStream?

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[])
    {
  Double i = new Double(257.578123456789);  
        float x = i.floatValue();
        System.out.print(x);
    }
}

What will be the output of the following Java program?

import java.io.*;
class Chararrayinput 
{
    public static void main(String[] args) 
    {
  String obj  = "abcdef";
        int length = obj.length();
        char c[] = new char[length];
        obj.getChars(0, length, c, 0);
        CharArrayReader input1 = new CharArrayReader(c);
        CharArrayReader input2 = new CharArrayReader(c, 0, 3);
        int i;
        try 
        {
while ((i = input2.read()) != -1) 
            {
                System.out.print((char)i);
            }
        } 
        catch (IOException e) 
        {
      // TODO Auto-generated catch block
            e.printStackTrace();
  }
}
}

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));
                   obj2.write(1); 
             }
           }
           System.out.print(obj2);
       }
    }
}

Which of these is a wrapper for data type int?

What is the signature of Math.random() method?

Which of these class contains only floating point functions?

Which of these classes can return more than one character to be returned to input stream?

Which of these classes is used for input and output operation when working with bytes?

Standard output variable 'out' is defined in which class?

Which of these class produce objects with respect to geographical locations?

What will be the output of the following Java code?

class binary 
{
     public static void main(String args[]) 
     {
         int num = 17;
         System.out.print(Integer.toBinaryString(num));
     }
}

Which of these classes encapsulate runtime state of an object?

Which of the following is method of System class is used to find how long a program takes to execute?