Java Check null /empty String

package com.java.myapp;

public class MyClass {

	public static void main(String[] args) {
          
    	String a = new String("");
    	String b = null;
    	String c = "";


        if(a == null){
        	System.out.println("a is null");
        }else{
        	System.out.println("a is not null");
        }
        
        if(a.equals("")){
        	System.out.println("a is empty");
        }else{
        	System.out.println("a is not empty");
        } 
        
        if(b == null){
        	System.out.println("b is null");
        }else{
        	System.out.println("b is not null");
        }

        if(c == ""){
        	System.out.println("c is empty");
        }else{
        	System.out.println("c is not empty");
        }      
    }
	
}