按照一定步骤执行方法，当时步骤内的方法可能发生修改或添加。
步骤
<pre>
public abstract class Module {
private static final String TAG = "Module";

protected void aVoid() {
    Log.i(TAG, "开始: ");
}

protected void bVoid() {
    Log.i(TAG, "加速: ");
}

protected void cVoid() {
    Log.i(TAG, "减速: ");
}

protected void dVoid() {
    Log.i(TAG, "结束: ");
}

public final void running() {
    Log.i(TAG, "running: 跑步---------------------");
    aVoid();
    bVoid();
    cVoid();
    dVoid();
    Log.i(TAG, "running: 跑步------------------------");
}

</pre>
A
<pre>
public class ModuleImplA extends Module {
private static final String TAG = "ModuleImplA";
@Override
protected void aVoid() {
Log.i(TAG, "ModuleImplA: 提前开始");
}
}
</pre>
B
<pre>
public class ModuleImplB extends Module {
private static final String TAG = "ModuleImplB";

@Override
protected void dVoid() {
    Log.i(TAG, "ModuleImplB: 提前结束");
}

}
</pre>
使用
<pre>
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Module module = new ModuleImplA();
    module.running();
    module = new ModuleImplB();
    module.running();
    module = new Module() {
        @Override
        protected void aVoid() {
            super.aVoid();
            Log.i(TAG, "MainActivity: 重新开始 ");
        }
    };
    module.running();
}

</pre>
log
<pre>
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步---------------------
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/ModuleImplA: ModuleImplA: 提前开始
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 加速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 减速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 结束:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步------------------------
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步---------------------
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 开始:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 加速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 减速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/ModuleImplB: ModuleImplB: 提前结束
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步------------------------
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步---------------------
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 开始:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/MainActivity: MainActivity: 重新开始
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 加速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 减速:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: 结束:
03-13 21:44:58.820 26327-26327/com.lerz.moduledmeo I/Module: running: 跑步------------------------
</pre>