// Test1.java文件
import java.io.*;
public class Test
{
public static void main(String[] args)
{
FileOutputStream fOut = new FileOutputStream("c://Test1.txt");
fOut.close();
System.out.println("被调用成功!");
}
}

// Test_Exec.java
public class Test_Exec
{
public static void main(String[] args)
{
Runtime run = Runtime.getRuntime();
Process p = run.exec("java test1");
}
}

// Test_Exec_Out.java
import java.io.*;
public class Test_Exec_Out
{
public static void main(String[] args)
{
Runtime run = Runtime.getRuntime();
Process p = run.exec("java test1");
BufferedInputStream in = new BufferedInputStream(p.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String s;
while ((s = br.readLine()) != null)
System.out.println(s);
}
}

// Test2.java文件
import java.io.*;
public class Test
{
public static void main(String[] args)
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("由父进程输入的信息：" + br.readLine());
}
}

// Test_Exec_In.java
import java.io.*;
public class Test_Exec_In
{
public static void main(String[] args)
{
Runtime run = Runtime.getRuntime();
Process p = run.exec("java test2");
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));
bw.write("向子进程输出信息");
bw.flush();
bw.close(); // 必须得关闭流，否则无法向子进程中输入信息
// System.in.read();
　}
}

// Test_Exec_Out.java
import java.io.*;
public class Test_Exec_Out
{
public static void main(String[] args)
{
ProcessBuilder pb = new ProcessBuilder("java", "test1");
Process p = pb.start();
… …
}
}

ProcessBuilder pb = new ProcessBuilder("Command", "arg2", "arg2", ''');
// 设置环境变量
Map<String, String> env = pb.environment();
env.put("key1", "value1");
env.remove("key2");
env.put("key2", env.get("key1") + "_test");
pb.directory("../abcd"); // 设置工作目录
Process p = pb.start(); // 建立子进程

  stdout = new BufferedReader(new InputStreamReader(p.getErrorStream())); 

import java.io.BufferedReader; 
import java.io.File; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 
 
public class Test3 { 
public static void main(String[] args) { 
  try { 
  List<String> list = new ArrayList<String>(); 
  ProcessBuilder pb = null; 
  Process p = null; 
  String line = null; 
  BufferedReader stdout = null; 
  //list the files and directorys under C:\ 
  list.add("CMD.EXE"); 
  list.add("/C"); 
  list.add("dir1"); 
  pb = new ProcessBuilder(list); 
  pb.directory(new File("C:\\")); 
  //merge the error output with the standard output 
  pb.redirectErrorStream(true); 
  p = pb.start(); 
  //read the standard output 
  stdout = new BufferedReader(new InputStreamReader(p 
   .getInputStream())); 
  while ((line = stdout.readLine()) != null) { 
   System.out.println(line); 
  } 
  int ret = p.waitFor(); 
  System.out.println("the return code is " + ret); 
  stdout.close(); 
  } catch (Exception e) { 
  e.printStackTrace(); 
  } 
}