修正方法: Java ネットワーク エラー: サーバーに接続できません

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

public class ServerChecker {
    public static boolean isServerRunning(String host, int port) {
        try (Socket socket = new Socket()) {
            InetAddress address = InetAddress.getByName(host);
            socket.connect(address, port);
            return true;
        } catch (IOException e) {
            return false;
        }
    }

    public static void main(String[] args) {
        String host = "localhost";
        int port = 8080;
        boolean isRunning = isServerRunning(host, port);
        System.out.println("Server is running: " + isRunning);
    }
}

import java.net.InetAddress;
import java.net.UnknownHostException;

public class AddressChecker {
    public static void main(String[] args) {
        String host = "example.com";
        try {
            InetAddress address = InetAddress.getByName(host);
            System.out.println("Host address: " + address.getHostAddress());
        } catch (UnknownHostException e) {
            System.out.println("Unknown host: " + host);
        }
    }
}

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

public class NetworkChecker {
    public static void main(String[] args) {
        String host = "www.google.com";
        try {
            InetAddress address = InetAddress.getByName(host);
            boolean isReachable = address.isReachable(5000);
            System.out.println("Network is reachable: " + isReachable);
        } catch (IOException e) {
            System.out.println("Network is unreachable");
        }
    }
}