What are the principles and advantages of Java closures?

The principle of closure in Java is to implement anonymous inner classes so that internal functions in methods can access external variables. The advantages include: 1. Data hiding to improve security; 2. Code reuse to enhance versatility; 3. Portability to facilitate movement between code blocks; 4. Security in concurrent environments to avoid data races.

The principles and advantages of Java closures

Principles

Java closures Is an internal function that can access external scope variables. In Java, closures are implemented through anonymous inner classes. When an anonymous inner class is created, it captures the scope of its outer method and it can still access those variables even after the outer method call ends.

Advantages

Java closures have the following advantages:

• ##Data hiding:Closures allow data to be hidden In the outer scope, thereby improving the security of the code.
• Code Reuse: Closures can create more general code that can be reused in different ways.
• Portability: Closures can be easily moved from one block of code to another without modifying dependencies.
• Concurrency: Because closures can capture variables from outer scopes, they can be safely used in concurrent environments without worrying about data races.

Practical case

The following is an example showing how to use Java closures:

public class ClosureExample {

    public static void main(String[] args) {
        // 外部作用域变量
        int x = 10;

        // 创建一个闭包
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                // 内部函数可以访问外部作用域变量
                System.out.println(x);
            }
        };

        // 使用闭包
        runnable.run();
    }
}

In this example, the outer scope Variable

x is captured into the anonymous inner class. When the run() method is called, it can access the value of x and print it.

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