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Java code:
import java.net.Socket;

public class Test {
public static void main(String args[]) {
for (int i = 1; i <= 65535; i++) {
try {
Socket s = new Socket("127.0.0.1", i);
System.out.println("port " + i + " ok");
s.close();
} catch (Exception ex) {
System.out.println(i+" is in use");
}
}
}
}

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Java codeimport java.io.IOException;import java.net.ServerSocket;import java.net.SocketAddress;/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
*http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agre