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Thread: Working with threads

  1. #1
    Junior Member
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    Default Working with threads

    My aim was to creat e a program that performs the following:
    o Create two threads
    o One thread asks the user to enter groups of 5 numbers
    o As soon as 5 numbers has been entered, the other thread computes it sum
    o This continues for each group until the end of input is reached

    I wrote the following code but itsd just not running, I guess I have not been able to codea good logic for them to synchronise please help!!!

    import java.io.BufferedReader;
    import java.io.InputStreamReader;
     
     
    public class Thrd1 implements Runnable {
    	public static int wakeup()
    	{
    		return 1;
    	}
    	static int Numbers []= new int[5];
    	int counter=0;
    	public void run()
    	{
    		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    		String temp=null;
    		try
    		{
    		System.out.println("Enter 5 numbers:");
    		for(int i=0;i<5;i++)
    		{
    		System.out.println("Enter "+(i+1)+" numner:");
    		temp=br.readLine();
    		Numbers[i]=Integer.parseInt(temp);
    		}
    			wakeup();
    		}
    		catch(Exception e)
    		{
    			System.out.println("Error:"+e.getMessage());
    		}
     
    		}
     
    	}
     
    public class Thrd2 implements Runnable {
    	public static int wakeup()
    	{
    		return 1;
    	}
    	public void run()
    	{
     
    		int sum=0;
    		System.out.println("The sum of numbers is:");
    		for (int i=0;i<5;i++)
    		{
    			sum+=Thrd1.Numbers[i];
     
    		}
    		System.out.println("Sum is ="+sum);
    		wakeup();
    	}
     
     
    	}
     
    public class MainClass {
     
    	public static void main(String[] args) {
    		while (true) {
    			Thrd1 obj1 = new Thrd1();
    			Thread firstthread = new Thread(obj1, "1st Thread");
    			Thrd2 obj2 = new Thrd2();
    			Thread secondthread = new Thread(obj2, "2nd Thread");
    			if (Thrd1.wakeup()==1)
    			{
    				try {
    					firstthread.wait();
    					secondthread.start();
    				} catch (InterruptedException e) {
    					e.printStackTrace();
    				}
    			}
    			if (Thrd2.wakeup()==1)
    			{
    				try {
    					firstthread.start();
    					secondthread.wait();
    				} catch (InterruptedException e) {
    					e.printStackTrace();
    				}
    			}
    		}
     
    	}
    }
    Last edited by copeg; July 12th, 2010 at 09:54 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Working with threads

    its just not running
    Do you get errors?
    Can you explain what is happening and show the console output?

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