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pubilc interface CallBack{

public void callbackMethod();
}
public class A implements CallBack{ // AʵÏÖ½Ó¿ÚCallBack
B b = new B();
public void do(){
b.doSomething(this); // AÔËÐÐʱµ÷ÓÃBÖÐdoSomething·½·¨,ÒÔ×ÔÉí´«Èë²ÎÊý£¬BÒÑÈ¡µÃA£¬¿ÉÒÔËæÊ±»Øµ÷AËùʵÏÖµÄCallBack½Ó¿ÚÖеķ½·¨
}
public void callbackMethod(){ // ¶ÔAÀ´Ëµ£¬¸Ã·½·¨¾ÍÊǻص÷·½·¨
System.out.println("callbackMethod is executing!");
}
}

public class B{
public void doSomething(CallBack cb){ // BÓµÓÐÒ»¸ö²ÎÊýΪCallBack½Ó¿ÚÀàÐ͵ķ½·¨
System.out.println(“I am processing my affairs… ”);
System.out.println(“then, I need invoke callbackMethod…”);
cb.callbackMethod();
}
}


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