In what scenarios are Java anonymous inner classes suitable for use?

Anonymous inner classes are suitable for the following scenarios: temporarily creating objects, such as used in event processing. Implement callback interfaces to provide specific behaviors to other classes. Thread parallel processing, create Runnable objects to perform tasks in multiple threads. Override parent class methods, used as anonymous subclasses to override methods in the parent class.

Scenarios where Java anonymous inner classes are applicable

Anonymous inner classes are a special inner class in Java that can be created by new object and pass the code. Unlike named inner classes, anonymous inner classes do not require a specific class name.

Anonymous inner classes are suitable for the following scenarios:

• Temporarily creating objects: When you need to use disposable objects, such as in event handling.
• Implementing callback interface: Anonymous inner classes can easily implement callback interfaces to provide specific behaviors to other classes.
• Thread Parallel Processing: Anonymous inner classes can be used to create Runnable objects to execute tasks in multiple threads in parallel.
• Override parent class methods: Anonymous inner classes can be used as anonymous subclasses to override methods in the parent class.

Practical case

The following is an example of using an anonymous inner class to implement the Runnable interface:

// 创建一个 Runnable 对象来启动一个新线程
Runnable task = new Runnable() {
    @Override
    public void run() {
        // 线程执行的任务
        System.out.println("Hello from a new thread!");
    }
};

// 创建并启动线程
Thread thread = new Thread(task);
thread.start();

In the above example, we An anonymous Runnable object is created that overrides the run() method. We then created and started a new thread that will perform the task.

Other practical examples of anonymous inner classes include:

• Use an ActionListener in an event handler to implement a click event for a button.
• Used as an ItemListener in a drop-down menu to respond to menu item selections.
• As a comparator object to sort collection elements.

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