为什么我的内部类看到一个非静态变量？

Question

早些时候,当内部匿名类没有看到"外部"类的字段时,我遇到了问题.我需要创建一个final变量,使其对内部类可见.现在我的情况相反.在"外部"类"ClientListener"中,我使用内部类"Thread"和"Thread"类,我使用"run"方法,并且确实从"外部"类中看到"earPort"!为什么？

import java.io.IOException;
import java.net.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ClientsListener {

    private int earPort;

    // Constructor.
    public ClientsListener(int earPort) {
        this.earPort = earPort;
    }

    public void starListening() {

        Thread inputStreamsGenerator = new Thread() {
            public void run() {
                System.out.println(earPort);
                try {
                    System.out.println(earPort);
                    ServerSocket listeningSocket = new ServerSocket(earPort);
                    Socket serverSideSocket = listeningSocket.accept();
                    BufferedReader in = new BufferedReader(new InputStreamReader(serverSideSocket.getInputStream()));
                } catch (IOException e) {
                    System.out.println("");
                }
            }
        };
        inputStreamsGenerator.start();      
    }

}

Answer 1

匿名内部类可以访问静态和实例变量.如果您还想访问局部变量,请将它们声明为final.这是它的工作方式:)