Java Programs | 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 to print Fibonacci sequence Recursive & Non Recursive

Editorial Team — Mon, 07 Feb 2011 10:44:27 +0000

The Fibonacci sequence is defined by the following rule. The first 2 values in the sequence are 1, 1. Every subsequent value is the sum of the 2 values preceding it. Write a Java program that uses both recursive and non-recursive functions to print
the nth value of the Fibonacci sequence.

/*Non Recursive Solution*/
import java.util.Scanner;
class Fib {
	public static void main(String args[ ]) {
		Scanner input=new Scanner(System.in);
		int i,a=1,b=1,c=0,t;
		System.out.println("Enter value of t:");
		t=input.nextInt();
		System.out.print(a);
		System.out.print(" "+b);
		for(i=0;i
/* Recursive Solution*/
import java.io.*;
import java.lang.*;
class Demo {
	int fib(int n) {
		if(n==1)
			return (1);
		else if(n==2)
			return (1);
		else
			return (fib(n-1)+fib(n-2));
	}
}
class RecFibDemo {
	public static void main(String args[])throws IOException {
		InputStreamReader obj=new InputStreamReader(System.in);
		BufferedReader br=new BufferedReader(obj);
		System.out.println("enter last number");
		int n=Integer.parseInt(br.readLine());
		Demo ob=new Demo();
		System.out.println("fibonacci series is as follows");
		int res=0;
		for(int i=1;i<=n;i++) {
			res=ob.fib(i);
			System.out.println(" "+res);
		}
		System.out.println();
		System.out.println(n+"th value of the series is "+res);
	}
}
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Java program to prints all real solutions to the quadratic equation ax2+bx+c = 0

Editorial Team — Mon, 07 Feb 2011 10:42:09 +0000

Write a Java program that prints all real solutions to the quadratic equation ax2+bx+c = 0. Read in a, b, c and use the quadratic formula. If the discriminant b2-4ac is negative, display a message stating that there are no real solutions.

import java.io.*;
class Quadratic
{
	public static void main(String args[])throws IOException
	{
		double x1,x2,disc,a,b,c;
		InputStreamReader obj=new InputStreamReader(System.in);
		BufferedReader br=new BufferedReader(obj);
		System.out.println("enter a,b,c values");
		a=Double.parseDouble(br.readLine());
		b=Double.parseDouble(br.readLine());
		c=Double.parseDouble(br.readLine());
		disc=(b*b)-(4*a*c);
		if(disc==0)
		{
			System.out.println("roots are real and equal ");
			x1=x2=-b/(2*a);
			System.out.println("roots are "+x1+","+x2);
		}
		else if(disc>0)
		{
			System.out.println("roots are real and unequal");
			x1=(-b+Math.sqrt(disc))/(2*a);
			x2=(-b+Math.sqrt(disc))/(2*a);
			System.out.println("roots are "+x1+","+x2);
		}
		else
		{
			System.out.println("roots are imaginary");
		}
	}
}

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Java program to display triangle 1 24 369 481216

surajk — Sat, 05 Feb 2011 13:29:29 +0000

/* Display Triangle as follow

   1

   2 4

   3 6 9

   4 8 12 16 ... N (indicates no. of Rows) */

class Output3{

	public static void main(String args[]){

		int n = Integer.parseInt(args[0]);

		for(int i=1;i<=n;i++){
			for(int j=1;j<=i;j++){
				System.out.print((i*j)+" ");
			}
			System.out.print("\n");
		}
	}
}

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Java program to display triangle 0 10 101 0101

surajk — Sat, 05 Feb 2011 13:28:49 +0000

/* Display Triangle as follow
   0
   1 0
   1 0 1
   0 1 0 1 */
class Output2{
	public static void main(String args[]){
		for(int i=1;i<=4;i++){
			for(int j=1;j<=i;j++){
				System.out.print(((i+j)%2)+" ");
			}
			System.out.print("\n");
		}
	}
}

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Java program to display triangle 1 23 456 78910

surajk — Sat, 05 Feb 2011 13:28:09 +0000

/* Display Triangle as follow : BREAK DEMO.
   1
   2 3
   4 5 6
   7 8 9 10 ... N */
class Output1{
	public static void main(String args[]){
		int c=0;
		int n = Integer.parseInt(args[0]);
loop1: for(int i=1;i<=n;i++){
loop2: for(int j=1;j<=i;j++){
	       if(c!=n){
		       c++;
		       System.out.print(c+" ");
	       }
	       else
		       break loop1;
       }
       System.out.print("\n");
       }
	}
}

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Java program to find average of consecutive N Odd no. and Even no.

surajk — Sat, 05 Feb 2011 13:27:21 +0000

class EvenOdd_Avg{
	public static void main(String args[]){
		int n = Integer.parseInt(args[0]);
		int cntEven=0,cntOdd=0,sumEven=0,sumOdd=0;
		while(n > 0){
			if(n%2==0){
				cntEven++;
				sumEven = sumEven + n;
			}
			else{
				cntOdd++;
				sumOdd = sumOdd + n;
			}
			n--;
		}
		int evenAvg,oddAvg;
		evenAvg = sumEven/cntEven;
		oddAvg = sumOdd/cntOdd;
		System.out.println("Average of first N Even no is "+evenAvg);
		System.out.println("Average of first N Odd no is "+oddAvg);
	}
}

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Java program to generate Harmonic Series 1 + 1/2 + 1/3 + 1/4 + 1/5

surajk — Sat, 05 Feb 2011 13:26:35 +0000

/* Write a program to generate Harmonic Series.
   Example :
   Input - 5
   Output - 1 + 1/2 + 1/3 + 1/4 + 1/5 = 2.28 (Approximately) */
class HarmonicSeries{
	public static void main(String args[]){
		int num = Integer.parseInt(args[0]);
		double result = 0.0;
		while(num > 0){
			result = result + (double) 1 / num;
			num--;
		}
		System.out.println("Output of Harmonic Series is "+result);
	}
}

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Java program to demonstrate switch case

surajk — Sat, 05 Feb 2011 13:25:41 +0000

/* switch case demo
   Example :
   Input - 124
   Output - One Two Four */
class SwitchCaseDemo{
	public static void main(String args[]){
		try{
			int num = Integer.parseInt(args[0]);
			int n = num; //used at last time check
			int reverse=0,remainder;
			while(num > 0){
				remainder = num % 10;
				reverse = reverse * 10 + remainder;
				num = num / 10;
			}
			String result=""; //contains the actual output
			while(reverse > 0){
				remainder = reverse % 10;
				reverse = reverse / 10;
				switch(remainder){
					case 0 :
						result = result + "Zero ";
						break;
					case 1 :
						result = result + "One ";
						break;
					case 2 :
						result = result + "Two ";
						break;
					case 3 :
						result = result + "Three ";
						break;
					case 4 :
						result = result + "Four ";
						break;
					case 5 :
						result = result + "Five ";
						break;
					case 6 :
						result = result + "Six ";
						break;
					case 7 :
						result = result + "Seven ";
						break;
					case 8 :
						result = result + "Eight ";
						break;
					case 9 :
						result = result + "Nine ";
						break;
					default:
						result="";
				}
			}
			System.out.println(result);
		}catch(Exception e){
			System.out.println("Invalid Number Format");
		}
	}
}

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Java program to find whether no. is palindrome or not

surajk — Sat, 05 Feb 2011 13:24:43 +0000

/* Write a program to find whether no. is palindrome or not.
   Example :
   Input - 12521 is a palindrome no.
   Input - 12345 is not a palindrome no. */
class Palindrome{
	public static void main(String args[]){
		int num = Integer.parseInt(args[0]);
		int n = num; //used at last time check
		int reverse=0,remainder;
		while(num > 0){
			remainder = num % 10;
			reverse = reverse * 10 + remainder;
			num = num / 10;
		}
		if(reverse == n)
			System.out.println(n+" is a Palindrome Number");
		else
			System.out.println(n+" is not a Palindrome Number");
	}
}

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