Android/Java：有没有存储方法的方法？

我有一个循环类，基本上如下所示：

public class Loop extends Thread {
    private boolean running;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            //Do stuff
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }
}

我想知道的是是否可以存储方法。例如，该类可以改为如下所示

public class Loop extends Thread {
    private boolean running;
    private Method method;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(method != null)
                method.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setMethod(Method m) {
        method = m;
    }
}

---

这样做可能吗？

我假设您希望在Java 6中使用此功能，因此可以使用

接口

和

匿名类

接口代码：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

你的帖子：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

设置侦听器：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

---

这将适用于您的用例。如果要保存方法并将方法作为数据传递，则必须使用Java8（并非所有Android API级别都支持）或Kotlin

我假设您希望在Java 6中使用此功能，因此可以使用

接口

和

匿名类

接口代码：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

你的帖子：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

设置侦听器：

public interface Listener {
    void callMethod();
}

public class Loop extends Thread {
    private boolean running;
    private Listener listener;

    public Loop() {
        running = false;
    }

    public void run() {
        while(running) {
            if(listener != null)
                listener.callMethod();
        }
    }

    public void setRunning(boolean b) {
        running = b;
    }

    public void setListener(Listener listener) {
        this.listener = listener;
    }
}

Loop loop = new Loop();

loop.setListener(new Listener() {
    @Override
    public void callMethod() {
    // Do stuff
    }
});

---

这将适用于您的用例。如果要保存方法并将方法作为数据传递，则必须使用Java8（并非所有Android API级别都支持）或Kotlin

尝试使用反射调用方法。您想要反射或Java 8函数，我不知道是哪个。尝试使用反射调用方法。您想要反射或Java 8函数，我不知道是哪个。