added Thread sleep

Author: connectaman

.idea/workspace.xml

@@ -129,7 +129,7 @@ It is used to develop rich internet applications. It uses a light-weight user in
 |[MultiThreading](https://github.com/connectaman/Java_Notes_and_Programs/blob/master/src/Multithreading/multithreading.md)|
 |[Life Cycle of Thread](https://github.com/connectaman/Java_Notes_and_Programs/blob/master/src/Multithreading/LifeCycle.md)|
 |[Create Thread](https://github.com/connectaman/Java_Notes_and_Programs/blob/master/src/Multithreading/CreateThread.md)|
-|[]()|
+|[Thread Sleep]()|
 |[]()|
 |[]()|
 

README.md

@@ -0,0 +1,72 @@
+### Sleep method in java
+
+The sleep() method of Thread class is used to sleep a thread for the specified amount of time.
+
+##### Syntax of sleep() method in java
+
+The Thread class provides two methods for sleeping a thread:
+
+   - public static void sleep(long miliseconds)throws InterruptedException
+   - public static void sleep(long miliseconds, int nanos)throws InterruptedException
+   
+--------
+
+##### Example of sleep method in java
+
+```java
+    class TestSleepMethod1 extends Thread{  
+     public void run(){  
+      for(int i=1;i<5;i++){  
+        try{Thread.sleep(500);}catch(InterruptedException e){System.out.println(e);}  
+        System.out.println(i);  
+      }  
+     }  
+     public static void main(String args[]){  
+      TestSleepMethod1 t1=new TestSleepMethod1();  
+      TestSleepMethod1 t2=new TestSleepMethod1();  
+       
+      t1.start();  
+      t2.start();  
+     }  
+    }  
+```
+Output
+```
+       1
+       1
+       2
+       2
+       3
+       3
+       4
+       4
+
+```
+
+
+
+##### Can we start a thread twice
+
+No. After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.
+
+Let's understand it by the example given below:
+
+```java
+
+
+    public class TestThreadTwice1 extends Thread{  
+     public void run(){  
+       System.out.println("running...");  
+     }  
+     public static void main(String args[]){  
+      TestThreadTwice1 t1=new TestThreadTwice1();  
+      t1.start();  
+      t1.start();  
+     }  
+    }  
+```
+Output
+```
+ running
+ Exception in thread "main" java.lang.IllegalThreadStateException
+```