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import java.net.*;
 
public class ScanPort {
    public static void main(String[] args) {
 
        for (int i = 0; i < 100; i++) {
            System.out.print("掃描Port " + i);
            try {
                Socket socket = new Socket("localhost", i);
                System.out.println(" 使用中");
                socket.close();
            } catch (Exception e) {
                System.out.println();
                continue;
            }
        }
        System.out.println("掃描結束");
    }
}