What is Sleep Function in Java Thread

Code:

class Sleep1 extends Thread

{

public void run()

{

for(int i=1;i<5;i++)

{

try

{

Thread.sleep(5000);

}

catch(InterruptedException e)

{

System.out.println(e);

}

System.out.println(i);

}

}

public static void main(String[]args)

{

Sleep1 t1=new Sleep1();

Sleep1 t2=new Sleep1();

t1.start();

t2.start();

}

}

Output: