Interfaces and Abstract Classes
practice.

How to use environment properties in the class?

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[])
    {
  String str = "true false";
        boolean x = Boolean.parseBoolean(str);
        System.out.print(x);
    }
}

What will be the output of the following Java code?

import java.io.*;
class files 
{
    public static void main(String args[]) 
    {
        File obj = new File("/java/system");
        System.out.print(obj.getName());
    }
}

Which of these is a super class of wrappers Byte and short wrappers?

What will be the output of the following Java program?

class exception_handling 
{
    public static void main(String args[]) 
    {
        try 
         {
            int a = 1;
            int b = 10 / a;
            try 
            {
                 if (a == 1)
                     a = a / a - a;
                 if (a == 2) 
                 {
                     int c[] = {1};
                     c[8] = 9;
                 }
            finally 
            {
                System.out.print("A");
            }

        }
        catch (NullPointerException e) 
        {
                System.out.println("B");
        }
    }
}

Which of these access specifiers can be used for an interface?

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");
 Constructor constructors[] = c.getConstructors();
 for (int i = 0; i < constructors.length; i++)
     System.out.println(constructors[i]);
   }
   catch (Exception e)
         {
               System.out.print("Exception");
         }
    }
}

Which of the following package stores all the standard java classes?

What type of methods an interface contain by default?

Which of these exceptions is thrown by compareTo() method defined in a double wrapper?

Which of these methods is used to check for infinitely large and small values?

What is true about the setProperties method?

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 = input1.read()) != -1) 
            {
                System.out.print((char)i);
            }
        } 
        catch (IOException e) 
        {
      // TODO Auto-generated catch block
            e.printStackTrace();
  }
}
}

Java system properties can be set at runtime.

What will be the output of the following Java code?

class Output 
{
    public static void main(String args[]) 
    {
        byte a[] = { 65, 66, 67, 68, 69, 70 };
        byte b[] = { 71, 72, 73, 74, 75, 76 };  
        System.arraycopy(a, 2, b, 1, a.length-2);
        System.out.print(new String(a) + " " + new String(b));
    }
}

What will be the output of the following Java program? (Note: file is made in c drive.)

import java.io.*;
class files 
{
    public static void main(String args[]) 
    {
        File obj = new File("/java/system");
        System.out.print(obj.getAbsolutePath());
    }
}

What will be the output of the following Java program?

class Output
{
    public static void main(String args[])
    {
        String str = "true";
        boolean x = Boolean.valueOf(str);
        System.out.print(x);
    }
}

What will be the output of the following Java program? (Note: file is made in c drive.)

import java.io.*;
class files 
{
    public static void main(String args[]) 
    {
        File obj = new File("/java/system");
        System.out.print(obj.canWrite());
        System.out.print(" " + obj.canRead());
    }
}

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("[" + boxContents.toString() + "]");
            counter++;
        }
    }
    public static void main(String[] args)
    {
        java.util.ArrayList<Box<Integer>> listOfIntegerBoxes = new java.util.ArrayList<>();
        BoxDemo.<Integer>addBox(Integer.valueOf(0), listOfIntegerBoxes);
        BoxDemo.outputBoxes(listOfIntegerBoxes);
    }
}

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[]) 
    {
        Integer i = new Integer(257);  
        float x = i.floatValue();
        System.out.print(x);
    }
}