Java program | Student Projects

Java Program to find the IP address of the Machine

Arun — Wed, 17 Apr 2013 07:04:59 +0000

Here is a simple Java Program to find the IP address of the Machine.


import java.util.*;
import java.lang.*;
import java.net.*;

public class GetOwnIP
{
    public static void main(String args[]) {
        try{
            InetAddress ownIP=InetAddress.getLocalHost();
            System.out.println("IP of my system is := "+ownIP.getHostAddress());
        }catch (Exception e){
            System.out.println("Exception caught ="+e.getMessage());
        }
    }
}

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Java program that illustrates how run time polymorphism is achieved

Editorial Team — Sun, 04 Oct 2009 16:16:01 +0000

class figure
{
	double d1,d2;
	figure(double a,double b)
	{
		d1=a;
		d2=b;
	}
	double area()
	{
		System.out.println("Area of the figure");
		return 0;
	}
}
class rectangle extends figure
{
	rectangle(double a,double b)
	{
		super(a,b);
	}
	double area()
	{
		System.out.println("Area of rectangle");
		return d1*d2;
	}
}
class triangle extends figure
{
	triangle(double a,double b)
	{
		super(a,b);	
	}
	double area()
	{
		System.out.println("Area of triangle");
		return d1*d2/2;
	}
}
class runpoly
{
	public static void main(String[] args)
	{
		figure f=new figure(45,6);
		rectangle r=new rectangle(10,30);
		triangle t=new triangle(10,20);
		figure a;
		a=f;
		System.out.println(a.area());
		a=r;
		System.out.println(a.area());
		a=t;
		System.out.println(a.area());
	}
}

Output:
Area of figure
0.0
Area of rectangle
300.0
Area of triangle
100.0

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Java program for implentation of consumer problem using inter thread communication

Editorial Team — Sun, 04 Oct 2009 15:23:29 +0000

Write a Java program that correctly implements producer consumer problem using the concept of inter thread communication.

class Q
{
	int n;
	boolean valueSet=false;
	synchronized int get()
	{
		if(!valueSet)
		try
		{
			wait();
		}
		catch(InterruptedException e)
		{
			System.out.println("Interrupted Exception caught");
		}
		System.out.println("Got:"+n);
		valueSet=false;
		notify();
		return n;
	}
	synchronized void put(int n)
	{
		if(valueSet)
		try
		{
			wait();
		}
		catch(InterruptedException e)
		{
			System.out.println("Interrupted Exception caught");
		}
		this.n=n;
		valueSet=true;
		System.out.println("Put:"+n);
		notify();
	}
}
class Producer implements Runnable
{
	Q q;
	Producer(Q q)
	{
		this.q=q;
		new Thread(this,"Producer").start();
	}
	public void run()
	{
		int i=0;
		while(true)
		{
			q.put(i++);
		}
	}
}
class Consumer implements Runnable
{
	Q q;
	Consumer(Q q)
	{
		this.q=q;
		new Thread(this,"Consumer").start();
	}
	public void run()
	{
		while(true)
		{
			q.get();
		}
	}
}
class ProdCons
{
	public static void main(String[] args)
	{
		Q q=new Q();
		new Producer(q);
		new Consumer(q);
		System.out.println("Press Control-c to stop");
	}
}

Output:

Put:1
Got:1
Put:2
Got:2
Put:3
Got:3
Put:4
Got:4
Put:5
Got:5
Put:6
Got:6
Put:7
Got:7
Put:8
Got:8
Put:9
Got:9
Put:10
Got:10
Put:11
Got:11
Put:12
Got:12
Put:13
Got:13
Put:14
Got:14

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Java program that displays the number of characters, lines and words in a text file

Editorial Team — Fri, 02 Oct 2009 18:00:29 +0000

import java.io.*;
class wordcount
{
	public static int words=0;
	public static int lines=0;
	public static int chars=0;
	public static void wc(InputStreamReader isr)throws IOException
	{
		int c=0;
		boolean lastwhite=true;
		while((c=isr.read())!=-1)
		{
			chars++;
			if(c=='\n')
				lines++;
			if(c=='\t' || c==' ' || c=='\n')
				++words;
			if(chars!=0)
				++chars;
		}	
       }
	public static void main(String[] args)
	{
		FileReader fr;
		try
		{
			if(args.length==0)
			{
				wc(new InputStreamReader(System.in));
			}
			else
			{
				for(int i=0;i
Output:
This is II CSE

1 4 32
Draw the frequency response

1 4 58
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Java program using String Tokenizer class

Editorial Team — Fri, 02 Oct 2009 15:48:08 +0000

Write a Java program that reads a line of integers and displays each integer and sum of all integers using String Tokenizer class

import java.util.StringTokenizer;
import java.util.Scanner;
class tokens
{
	public static void main(String[] args)
	{
		Scanner input=new Scanner(System.in);
		String sentence=input.nextLine();
		String temp;
		int k,total=0;
		StringTokenizer s1=new StringTokenizer(sentence);
		System.out.println("Total Number of tokens:"+s1.countTokens());
		while(s1.hasMoreTokens())
		{
			temp=s1.nextToken();
			k=Integer.parseInt(temp);
			total+=k;
			System.out.print(k+"\t");
		}
		System.out.println("Sum of tokens :"+total);
	}
}

Output:

12 43 78 98
Total Number of tokens:4
12 43 78 98
Sum of tokens : 231

123 456 798
Total number of tokens:3
123 456 798
Sum of tokens:1377

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