blic class Test { public static void main(String[] args) { } } //定义接口 interface InterA { void showA(); } class A { public void methodA(InterA a) { a.showA(); }

这是一个 Java 代码的模板，其中定义了一个 Test 类和一个 InterA 接口，以及一个 A 类，A 类中有一个 methodA() 方法，该方法接收一个 InterA 类型的参数，并调用它的 showA() 方法。

在 Test 类的 main() 方法中，可以实例化 A 类的对象，并调用它的 methodA() 方法，将一个实现了 InterA 接口的类的实例作为参数传入，从而执行该实例的 showA() 方法。

需要注意的是，InterA 接口中只定义了一个抽象方法 showA()，实现了该接口的类需要实现该方法。而 A 类中的 methodA() 方法是一个非抽象方法，可以直接调用该参数的 showA() 方法。

相关问题

import java.util.ArrayList; import java.util.List; public class Practice1 { public static void main(String[] args) { List<Process> processes = new ArrayList<>(); processes.add(new Process(1, 0, 5)); processes.add(new Process(2, 1, 3)); processes.add(new Process(3, 2, 8)); processes.add(new Process(4, 3, 6)); processes.add(new Process(5, 4, 2)); Scheduler scheduler = new Scheduler(processes); scheduler.fcfs();//先来先服务 scheduler.sjf();//最短作业优先 scheduler.hrrn();//最高响应比优先 } } class Process {//定义进程类，用于存储进程的相关信息 int pName;//进程名字 int arrivalTime;//进程到达时间 int executeTime;//进程执行时间 public Process(int pName, int arrivalTime, int executeTime) { this.pName = pName; this.arrivalTime = arrivalTime; this.executeTime = executeTime; } } class Scheduler {//调度器类，用于实现不同的调度算法 List<Process> processes;//所有进程 List<Process> readyQueue;//就绪队列 List<Process> finishedProcesses;//已完成的进程 public Scheduler(List<Process> processes) { this.processes = processes; this.readyQueue = new ArrayList<>(); this.finishedProcesses = new ArrayList<>(); } public void fcfs() {//先来先服务 int currentTime = 0; while (!readyQueue.isEmpty() || !processes.isEmpty()) { //将到达时间小于等于当前时间的进程加入就绪队列 while (!processes.isEmpty() && processes.get(0).arrivalTime <= currentTime) { readyQueue.add(processes.remove(0)); } if (readyQueue.isEmpty()) { currentTime++;//如果没有进程在执行，时间+1 } else { Process process = readyQueue.get(0);//执行队首进程 process.executeTime--; currentTime++; process = readyQueue.remove(0); if (process.executeTime == 0) { //进程完成 processFinish(process, currentTime); } } } } pu

blic void sjf() {//最短作业优先 int currentTime = 0; while (!readyQueue.isEmpty() || !processes.isEmpty()) { //将到达时间小于等于当前时间的进程加入就绪队列 while (!processes.isEmpty() && processes.get(0).arrivalTime <= currentTime) { readyQueue.add(processes.remove(0)); } if (readyQueue.isEmpty()) { currentTime++;//如果没有进程在执行，时间+1 } else { //找到执行时间最短的进程，并执行 Process shortestProcess = readyQueue.get(0); for (int i = 1; i < readyQueue.size(); i++) { if (readyQueue.get(i).executeTime < shortestProcess.executeTime) { shortestProcess = readyQueue.get(i); } } shortestProcess.executeTime--; currentTime++; if (shortestProcess.executeTime == 0) { //进程完成 processFinish(shortestProcess, currentTime); } } } } public void hrrn() {//最高响应比优先 int currentTime = 0; while (!readyQueue.isEmpty() || !processes.isEmpty()) { //将到达时间小于等于当前时间的进程加入就绪队列 while (!processes.isEmpty() && processes.get(0).arrivalTime <= currentTime) { readyQueue.add(processes.remove(0)); } if (readyQueue.isEmpty()) { currentTime++;//如果没有进程在执行，时间+1 } else { //计算每个进程的响应比，并找到响应比最高的进程执行 Process highestRatioProcess = readyQueue.get(0); double highestRatio = (double) (highestRatioProcess.executeTime + currentTime - highestRatioProcess.arrivalTime) / highestRatioProcess.executeTime; for (int i = 1; i < readyQueue.size(); i++) { Process process = readyQueue.get(i); double ratio = (double) (process.executeTime + currentTime - process.arrivalTime) / process.executeTime; if (ratio > highestRatio) { highestRatioProcess = process; highestRatio = ratio; } } highestRatioProcess.executeTime--; currentTime++; if (highestRatioProcess.executeTime == 0) { //进程完成 processFinish(highestRatioProcess, currentTime); } } } } private void processFinish(Process process, int finishTime) { process.executeTime = finishTime - process.arrivalTime;//计算进程响应时间 finishedProcesses.add(process); } }

将下列java代码改为python代码：blic static void scan(String host, int startPort, int endPort) throws InterruptedException { List<Integer> portList = new ArrayList<>(); final CountDownLatch latch = new CountDownLatch(endPort - startPort + 1); for (int port = startPort; port <= endPort; port++) { int finalPort = port; Thread thread = new Thread(new Runnable() { @Override public void run() { try { Socket socket = new Socket(); socket.connect(new InetSocketAddress(host, finalPort), 100); System.out.println("TCP端口" + finalPort + "开放"); portList.add(finalPort); } catch (Exception e) { } try { DatagramSocket dsocket = new DatagramSocket(finalPort); dsocket.close(); } catch (SocketException e) { portList.add(finalPort); System.out.println("UDP端口" + finalPort + "开放"); } latch.countDown(); } }); thread.start(); } latch.await(); portList.sort(new Comparator<Integer>() { @Override public int compare(Integer o1, Integer o2) { return o1.compareTo(o2); } }); }

由于Python是一种解释型语言，因此需要使用不同的模块和语言结构来实现相同的功能。以下是一个类似的Python代码：

import socket
import threading

def scan(host, startPort, endPort):
portList = []
lock = threading.Lock()

def checkPort(port):
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(0.1)
result = sock.connect((host, port))
with lock:
portList.append(port)
print("TCP端口" + str(port) + "开放")
sock.close()
except:
pass

try:
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(0.1)
sock.bind((host, port))
with lock:
portList.append(port)
print("UDP端口" + str(port) + "开放")
sock.close()
except:
pass

threads = []
for port in range(startPort, endPort+1):
t = threading.Thread(target=checkPort, args=(port,))
threads.append(t)
t.start()

for t in threads:
t.join()

portList.sort()
return portList

# 示例
if __name__ == "__main__":
host = "127.0.0.1"
startPort = 1
endPort = 65535
openPorts = scan(host, startPort, endPort)
print(openPorts)