Java使用觀察者模式監控想監控的變數的變化

下面是老大類裡面的一個變數變了，小弟能收到通知，並執行對應的內容

package com.lin;
import java.util.Observable;
import java.util.Observer;
import java.io.BufferedReader; 
import java.io.IOException;
import java.io.InputStreamReader; 
public class Hello {
      /**
       * @param args
       * @throws IOException
       */
 

      public static void main(String[] args) throws IOException {
            // TODO Auto-generated method stub
            System.out.print("風和日麗中\n\r");
            AxeGangBoss leader=new AxeGangBoss("老大");
            AxeGangPeople people1=new AxeGangPeople("甲");
            AxeGangPeople people2=new
 
 AxeGangPeople("乙");
            leader.addObserver(people1);
            leader.addObserver(people2);
            leader.testPeople("救命(測試小弟是否能響應通知)");
            System.out.print("阻塞等待");
      }
}
class AxeGangBoss extends Observable {
      private int intTestPeople;//定時測試小弟
      private String mName;
      public
 
 AxeGangBoss(String name) {
            // TODO Auto-generated constructor stub
            mName = name;
      }
      // 通知其他人
      public void testPeople(String msg) {
            intTestPeople=0;
            //指定變數變成特定數值時候就通知小弟
            while (intTestPeople!=100) {
                  intTestPeople+=10;
                  try {
                        Thread.sleep(200);
                  } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                  }
            }
            //因為其他地方不會更改intTestPeople的值，
            //那就不應該在其他地方寫下面這兩行
            setChanged();
            notifyObservers(msg);
      }
      public String getmName() {
            return mName;
      }
      public void setmName(String mName) {
            this.mName = mName;
      }
}
class AxeGangPeople implements Observer {
      String mName;
      public AxeGangPeople(String name) {
            // TODO Auto-generated constructor stub
            mName = name;
      }
      //小弟收到資訊做事
      public void update(Observable arg0, Object arg1) {
            // TODO Auto-generated method stub
            AxeGangBoss writer;
            if (arg0 instanceof AxeGangBoss) {
                  writer = (AxeGangBoss) arg0;
                  System.out.print(getmName() + "收到來自:" + writer.getmName()
                              + "的資訊:" + arg1.toString()+"\n\r");
            }
      }
      public String getmName() {
            return mName;
      }
      public void setmNameString(String mName) {
            this.mName = mName;
      }
}

風和日麗中


2秒後



乙收到來自:老大的資訊:救命(測試小弟是否能響應通知)
甲收到來自:老大的資訊:救命(測試小弟是否能響應通知)
阻塞等待