编程思想第四版十三章字符串代码问题

_Grow_up 2017-06-23 04:54:06

JAVA编程思想第四版，第十三章练习题有一些不能编译、或者说编译的结果跟书上的不一样？求解
比如说这个
//：string/JGrep.java
// A very simple version of the "grep" program.
// {Args: JGrep.java "\\b[Ssct]\\w+"}
import java.util.regex.*;
import net.mindview.util.*;

public class JGrep {
public static void main(String[] args) throws Exception {
if(args.length < 2) {
System.out.println("Usage: java JGrep file regex");
System.exit(0);
}
Pattern p = Pattern.compile(args[1]);
// Iterate through the lines of the input file:
int index = 0;
Matcher m = p.matcher("");
for(String line : new TextFile(args[0])) {
m.reset(line);
while(m.find())
System.out.println(index++ + ": " +
m.group() + ": " + m.start());
}
}
} /* Output: (Sample)
0: strings: 4
1: simple: 10
2: the: 28
3: Ssct: 26
4: class: 7
5: static: 9
6: String: 26
7: throws: 41
8: System: 6
9: System: 6
10: compile: 24
11: through: 15
12: the: 23
13: the: 36
14: String: 8
15: System: 8
16: start: 31
*///:~

而我编译的结果是：
Usage: java JGrep file regex

下载的习题答案也差不多，搞不懂，解决了问题的朋友解答一下吧！！！

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