This的小程序

ThisTest.java

public class ThisTest { 

String s = "Hello"; 

public Hello(String s)
{ 
System.out.println("s = " + s); 
System.out.println("1 -> this.s = " + this.s); 
this.s = s; 
System.out.println("2 -> this.s = " + this.s); 
} 

public static void main(String[] args) { 
Hello x= new Hello("HelloWorld!"); 
} 
}