java代码回显怎么写

回答: 要实现Java代码的回显，可以使用以下代码作为参考：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Echo {
    public static void main(String\[\] args) throws Exception {
        String cmd = "your command here";
        ProcessBuilder processBuilder = new ProcessBuilder(cmd);
        Process process = processBuilder.start();
        InputStream inputStream = process.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            System.out.println(line);
        }
    }
}

这段代码使用`ProcessBuilder`来执行命令，并通过`getInputStream()`方法获取命令的输出流。然后使用`BufferedReader`逐行读取输出，并将每行输出打印到控制台。你可以将"your command here"替换为你想要执行的具体命令。
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