Interfaces and Abstract Classes
practice.

How many bits are used for generating random numbers?

What will be the output of the following Java program?

class Output 
{
     public static void main(String args[])
     {
         char a[] = {'a', '5', 'A', ' '};   
         System.out.print(Character.isDigit(a[0])+ " ");
         System.out.print(Character.isWhitespace(a[3])+ " ");
         System.out.print(Character.isUpperCase(a[2]));
    }
}

Which of these methods is called when observed object has changed?

Which of these class allows us to get real time data about private and protected member of a class?

Which of the following is not a memory classification in java?

What will be the output of the following Java program?

public class BoxDemo 
{
    public static <U> void addBox(U u, 
    java.util.List<Box<U>> boxes) 
    {
       Box<U> box = new Box<>();
       box.set(u);
       boxes.add(box);
    }
    public static <U> void outputBoxes(java.util.List<Box<U>> boxes)
    {
        int counter = 0;
        for (Box<U> box: boxes) 
        {
            U boxContents = box.get();
            System.out.println("Box #" + counter + " contains [" + boxContents.toString() + "]");
            counter++;
        }
    }        
    public static void main(String[] args)
    {
        java.util.ArrayList<Box<Integer>> listOfIntegerBoxes = new java.util.ArrayList<>();
        BoxDemo.<Integer>addBox(Integer.valueOf(10), listOfIntegerBoxes);
        BoxDemo.outputBoxes(listOfIntegerBoxes);
    }
}

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());
    }
}

Which of these methods of Character wrapper can be used to obtain the char value contained in Character object.

Which class loader loads jar files from JDK directory?

What will be the output of the following Java code snippet?

int a = random.nextInt(15) + 1;

Which of these stream contains the classes which can work on character stream?

Which of the following is the correct way of importing an entire package 'pkg'?

Why are generics used?

What will be the output of the following Java program?

import java.lang.reflect.*;
class Additional_packages 
{	 
     public static void main(String args[]) 
     {
   try
         {
       Class c = Class.forName("java.awt.Dimension");
 Method methods[] = c.getMethods();
 for (int i = 0; i < methods.length; i++)
     System.out.println(methods[i]);
   }
   catch (Exception e)
         {
             System.out.print("Exception");
         }
    }
}

Which of these is a super class of wrappers Double and Float?

Can "abstract" keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block.

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[]) 
    {
        int a = Character.MAX_VALUE;
        System.out.print((char)a);
    }
}

Which of these methods can be used to check whether the given value is a number or not?

Which of these method of Locale class can be used to obtain country of operation?

What will be the output of the following Java program?

class newthread implements Runnable 
{
Thread t1,t2;
    newthread() 
    {
        t1 = new Thread(this,"Thread_1");
        t2 = new Thread(this,"Thread_2");
        t1.start();
        t2.start();
}
public void run() 
    {
        t2.setPriority(Thread.MAX_PRIORITY);	
  System.out.print(t1.equals(t2));
    }    
}
class multithreaded_programing 
{
    public static void main(String args[]) 
    {
        new newthread();        
    }
}