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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone extends Thread
{
	public void run()
	{
		for(int i=1;i<5;++i)
		{
			try { Thread.sleep(500);}catch(InterruptedExecution i){System.out.println(i);}
			System.out.println(i);
		}
	}
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Ideone i1= new Ideone();
		Ideone i2= new Ideone();
		i1.start();
		i2.start();
	}
}

Main.java:14: error: cannot find symbol
			try { Thread.sleep(500);}catch(InterruptedExecution i){System.out.println(i);}
			                               ^
  symbol:   class InterruptedExecution
  location: class Ideone
Main.java:14: error: variable i is already defined in method run()
			try { Thread.sleep(500);}catch(InterruptedExecution i){System.out.println(i);}
			                                                    ^
2 errors

Standard output is empty