Interfaces and Abstract Classes
practice.

Which of these methods initiates garbage collection?

What will be the output of the following Java program? (Note: inputoutput.java is stored in the disk.)

import java.io.*;
class filesinputoutput 
{
    public static void main(String args[]) 
    {
        InputStream obj = new FileInputStream("inputoutput.java");
        System.out.print(obj.available());
    }
}

Which of these methods return a class object given its name?

Which of the following access specifiers can be used for an interface?

What will be the output of the following Java program?

interface calculate
{
    void cal(int item);
}
class displayA implements calculate
{
    int x;
    public void cal(int item)
    {
        x = item * item;            
    }
}
class displayB implements calculate
{
    int x;
    public void cal(int item)
    {
        x = item / item;            
    }
}
class interfaces 
{
    public static void main(String args[])
    {
        displayA arr1 = new displayA;
        displayB arr2 = new displayB;
        arr1.x = 0;
        arr2.x = 0;      
        arr1.cal(2);
        arr2.cal(2);
        System.out.print(arr1.x + " " + arr2.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.getParent());
        System.out.print(" " + obj.isFile());
    }
}

Which of these class is used to make a thread?

What will be the output of the following Java code?

class Output
{
    public static void main(String args[])
    {
        Double y = new Double(257.57812);
  Double i = new Double(257.578123456789);  
        try
        {
      int x = i.compareTo(y);
            System.out.print(x);
        }
        catch(ClassCastException e)
        {
            System.out.print("Exception");
        }
}
}

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?

import java.util.*;
class LOCALE_CLASS
{
    public static void main(String args[])
    {
        Locale obj = new Locale("HINDI", "INDIA") ;
        System.out.print(obj.getCountry());
    }
}

What will be the output of the following Java program?

import java.lang.System;
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, 3, a.length - 4);
        System.out.print(new String(a) + " " + new String(b));
    }
}

Does code Segment loads the java code?

Which of the following is a method of wrapper Float for converting the value of an object into byte?

Which of these Exceptions is thrown by loadClass() method of ClassLoader class?

Which of these interface is not a member of java.io package?

Which of these package is used for graphical user interface?

How to read a classpath file?

toRadian() and toDegree() methods were added by which version of Java?

Which of the following exceptions is thrown by every method of Runtime class?

Which of these is a method to clear all the data present in output buffers?