Mac 如果一定要写个锁屏程序的话就这样

package test;

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

public class RuntimeCMD  {

private static Process p;

public static void main(String[] args) throws IOException, InterruptedException {
InputStream in=getInputStreambyExecScript("scripts/test.sh");
BufferedReader fr=new BufferedReader(new InputStreamReader(in));
String line;
while((line=fr.readLine())!=null){
System.out.println(line);
}
p.waitFor();
fr.close();
p.destroy();
}

private static InputStream getInputStream(String exec) throws IOException{
p=Runtime.getRuntime().exec(exec);
return p.getInputStream();
}

private static InputStream getInputStreambyExecScript(String exec) throws IOException{
p=Runtime.getRuntime().exec(new String[]{"/bin/sh","-c",exec},null,null);
return p.getInputStream();
}
}

#!/bin/bash
'/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/CGSession' -suspend