很有意思的问题，为什么运行没有错，调试的时候却报错！！！！

[hou553403977]

public class Groups {
static public final String POEM = "I am singing o\n" + "I am dawning o\n"
+ "I am thinking o\n";

public static void main(String[] args) {

Matcher m = Pattern.compile("(?m)(\\S+)\\s+((\\S+)\\s+(\\S+))$")
.matcher(POEM);
while (m.find()) {
for (int j = 0; j <= m.groupCount(); j++) {
System.out.print("[" + m.group(j) + "]");
}
System.out.println();
}
}
}
为什么代码运行没有错，在for循环里面设断点调试的时候却报错，或者在while处设断点就进不去while循环里面，求高手解答!!!!

[ss36290109]

运行结果如下：
[am singing o][am][singing o][singing][o]
[am dawning o][am][dawning o][dawning][o]
[am thinking o][am][thinking o][thinking][o]
按你说的设了断点正常运行啊。。

[sffx123]

正常运行

[hou553403977]

[Quote=引用楼主 的回复:]
public class Groups {
static public final String POEM = "I am singing o\n" + "I am dawning o\n"
+ "I am thinking o\n";

public static void main(String[] args) {

Matcher m = Pattern.compile("(?m……
[/Quote]
调试进去的时候

[hou553403977]

[Quote=引用 1 楼 的回复:]

运行结果如下：
[am singing o][am][singing o][singing][o]
[am dawning o][am][dawning o][dawning][o]
[am thinking o][am][thinking o][thinking][o]
按你说的设了断点正常运行啊。。
[/Quote]
我出现了IllegalStateException

[hou553403977]

[Quote=引用 2 楼 的回复:]

正常运行
[/Quote]
我出现了IllegalStateException

[VanBaston]

调试了下也是正常运行的啊，没报异常啊

[hou553403977]

[Quote=引用 6 楼 的回复:]

调试了下也是正常运行的啊，没报异常啊
[/Quote]
不是吧，不是就我一个人吧！！！

[hou553403977]

我调试的时候按2下f6，就进入到了Matcher.class然后就进入这个函数
public String group(int group) {
if (first < 0)
throw new IllegalStateException("No match found");
..................
｝

[宝持微笑继续我的骄傲]

[am singing o][am][singing o][singing][o]
[am dawning o][am][dawning o][dawning][o]
[am thinking o][am][thinking o][thinking][o]

运行正常，调试了也正常