code perfect

lib_design_pattern/src/main/java/com/mxdl/desigin/pattern/Test.java

-package com.mxdl.desigin.pattern;
-
-import java.util.ArrayList;
-import java.util.Observable;
-import java.util.Observer;
-
-/**
- * Description: <Test><br>
- * Author:      mxdl<br>
- * Date:        2019/12/19<br>
- * Version:     V1.0.0<br>
- * Update:     <br>
- */
-public class Test {
-    public static void main(String[] args) {
-//        String a = "a";
-//        String b = "a";
-//        if(a == b){
-//            System.out.println("true");
-//        }else{
-//            System.out.println("false");
-//        }
-//        if(a.equals(b)){
-//            System.out.println("true");
-//        }else{
-//            System.out.println("false");
-//        }
-        Observable observable = new Observable();
-
-        observable.addObserver(new Observer() {
-            @Override
-            public void update(Observable o, Object arg) {
-                System.out.println("update 1 start...");
-            }
-        });
-        observable.addObserver(new Observer() {
-            @Override
-            public void update(Observable o, Object arg) {
-                System.out.println("update 2 start...");
-            }
-        });
-        System.out.println("update 22 start...");
-        observable.notifyObservers("fff");
-        Iterable iterable;
-        ArrayList list;
-    }
-}