System.out.println(null)

Program #1: what will happen when we print System.out.println(null)

Program #2: what will happen when we print System.out.println(null) by type casting
   

1. package com.systemoutprintn;
2. public class Test {
3.  
4.     /**
5.      * @Website: www.instanceofjava.com
6.      * @category: System.out.println(null)
7.      */
8.  
9. public static void main(String[] args) {
10.  
11.          System.out.println((String)null);//null
12.          System.out.println((Object)null);//null
13.          System.out.println((char[])null);
14.             
15.  
16. }
17.  
18. }

 Output:
  

1. null
2. null
3. Exception in thread "main" java.lang.NullPointerException
4.     at java.io.Writer.write(Unknown Source)
5.     at java.io.PrintStream.write(Unknown Source)
6.     at java.io.PrintStream.print(Unknown Source)
7.     at java.io.PrintStream.println(Unknown Source)
8.     at com.systemoutprintn.Test.main(Test.java:13)