exec(cmd)和exec(cmdarray)的区别

 

public Process exec(String command) throws IOException

 和

 

public Process exec(String cmdarray[]) throws IOException

 其实是等价的，最终都会调用

 

public Process exec(String[] cmdarray, String[] envp, File dir) throws IOException

 因为如下代码：

public Process exec(String command, String[] envp, File dir)
        throws IOException {
        if (command.length() == 0)
            throw new IllegalArgumentException("Empty command");

	StringTokenizer st = new StringTokenizer(command);
	String[] cmdarray = new String[st.countTokens()];
 	for (int i = 0; st.hasMoreTokens(); i++)
	    cmdarray[i] = st.nextToken();
	return exec(cmdarray, envp, dir);
    }

 这里最终是：return exec(cmdarray, envp, dir);