// patterns/SingletonPattern3.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

class MyString {

private String s;

public MyString(String s) {

this.s = s;

}

public synchronized

void change(String s) {

this.s = s;

}

@Override public synchronized

String toString() {

return s;

}

}

public class SingletonPattern3 {

public static void main(String[] args) {

Single<MyString> x =

new Single<>(new MyString("Hello"));

System.out.println(x.get());

x.get().change("World!");

System.out.println(x.get());

}

}

/* Output:

Hello

World!

*/