java sourcecodes | Student Projects

Java program for creating multiple threads

Editorial Team — Sun, 04 Oct 2009 15:10:08 +0000

class NewThread implements Runnable
{
	String name;
	Thread t;
	NewThread(String threadname)
	{
		name=threadname;
		t=new Thread(this,name);
		System.out.println("New Thread:"+t);
		t.start();
	}
	public void run()
	{
		try
		{
			for(int i=5;i>0;i--)
			{
				System.out.println(name+ ":"+i);
				Thread.sleep(1000);
			}
		}
		catch(InterruptedException e)
		{
			System.out.println(name+" Interrupted");
		}
		System.out.println(name+" exiting");
	}
}
class MultiThreadDemo
{
	
public static void main(String[] args)
	{
		new NewThread("One");
		new NewThread("Two");
		new NewThread("Three");
		try
		{
			Thread.sleep(10000);
		}
		catch(InterruptedException e)
		{
			System.out.println("Main Thread Interrupted");
		}
		System.out.println("Main Thread Exiting");
	}
}

Output:

New Thread :Thread[One,5,main]
New Thread : Thread[Two,5,main]
One:5
Two:5
New Thread : Thread[Three,5,main]
Three:5
One:4
Three:4
Two:4
One:3
Three:3
Two:3
One:2
Three:2
Two:2
One:1
Three:1
Two:1
One exiting
Three exiting
Two exiting
Main Thread Exiting

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Java program that prints all real solutions to the quadratic equation ax2+bx+c=0

Editorial Team — Fri, 02 Oct 2009 14:28:27 +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 roots.

import java.util.Scanner;
 class solutions
{
	public static void main(String[] args)
	{
		int a,b,c;
		double x,y;
		Scanner s=new Scanner(System.in);
		System.out.println(“Enter the values of a,b, and c”);
		a=s.nextInt();
		b=s.nextInt();
		c=s.nextInt();
		int k=(b*b)-4*a*c;
		if(k<0)
		{
			System.out.println(“No real roots”);
		}
		else
		{
			double l=Math.sqrt(k);
			x=(-b-l)/2*a;
			y=(-b+l)/2*a;
			System.out.println(“Roots of given equation:”+x+” “+y);
		}
	}
}

Output:

Enter the values of a,b,c
1
5
6
Roots of given equation:-3.0 -2.0

Enter the values of a, b, c
1
2
2
No real solutions

Enter the values of a, b, c
1
3
2
Roots of given equation: -2.0 -1.0

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