Runtime类的下面这个方法：
public Process exec(String command, String envp[], File dir)
throws IOException {
int count = 0;
String cmdarray[];
StringTokenizer st;
if (command == "")
throw new IllegalArgumentException("Empty command");
st = new StringTokenizer(command);
count = st.countTokens();
cmdarray = new String[count];
//上面已经取过了，为什么重取一次，而且count值没有用？？？？
st = new StringTokenizer(command);
count = 0;
while (st.hasMoreTokens()) {
cmdarray[count++] = st.nextToken();
}
return exec(cmdarray, envp, dir);
}
不知大家的jdk源码是不是这样得？我的好像是1.41版的
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