尝试解释检查网络连接的java嵌套循环。

import java.io.IOException;
import java.net.InetAddress;

public class NetworkConnectionChecker {
    public static void main(String[] args) {
        String[] websites = {"www.example.com", "www.google.com", "www.bing.com"};
        
        for (String website : websites) {
            boolean isConnected = false;
            
            for (int i = 0; i < 3; i++) { // 嵌套循环，尝试3次
                try {
                    InetAddress inetAddress = InetAddress.getByName(website);
                    isConnected = inetAddress.isReachable(5000); // 5秒内是否可达
                    
                    if (isConnected) {
                        System.out.println("成功连接到：" + website);
                        break; // 跳出内部循环
                    }
                } catch (IOException e) {
                    System.out.println("无法连接到：" + website);
                }
            }
            
            if (!isConnected) {
                System.out.println("无法连接到：" + website);
            }
        }
    }
}