What does arrow mean in java

The arrow (->) in Java represents an anonymous inner class, an inner class that does not need to declare a name, to simplify the code: Syntax: new OuterClass() { // Code for anonymous inner classes} Usage : Implement interface Extend abstract class Create event handler

Arrow (->) in Java

The arrow (->) represents an anonymous inner class in Java.

Anonymous inner class is an inner class that does not need to declare a name. It is usually used to simplify code and avoid creating separate class files.

Syntax:

new OuterClass() {
    // 匿名内部类的代码
};

Usage:

Anonymous inner classes are usually used when one-time classes need to be created and used quickly Scenarios, for example:

• Implementing the interface: You can implement the interface anonymously, just override all methods in the interface.
• Extending abstract classes: You can extend abstract classes anonymously, just implement abstract methods.
• Create event handlers: Event handlers can be easily created using anonymous inner classes, just override the required event methods.

For example:

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

Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        // 线程要执行的任务
    }
});

Anonymous inner A class can access non-private member variables and methods in its outer class. You must be careful when modifying non-final variables in anonymous inner classes, as this may cause thread safety issues.

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