疑难 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
jdk源代码中..
charloop, bufferloop, 是什么用处..
如 :
String readLine(boolean ignoreLF) throws IOException {
StringBuffer s = null;
int startChar;
boolean omitLF = ignoreLF || skipLF;
synchronized (lock) {
ensureOpen();
bufferLoop:
for (;;) {
if (nextChar >= nChars)
fill();
if (nextChar >= nChars) { /* EOF */
if (s != null && s.length() > 0)
return s.toString();
else
return null;
}
boolean eol = false;
char c = 0;
int i;
/* Skip a leftover '\n', if necessary */
if (omitLF && (cb[nextChar] == '\n'))
nextChar++;
skipLF = false;
omitLF = false;
charLoop:
for (i = nextChar; i < nChars; i++) {
c = cb[i];
if ((c == '\n') || (c == '\r')) {
eol = true;
break charLoop;
}
}
startChar = nextChar;
nextChar = i;
if (eol) {
String str;
if (s == null) {
str = new String(cb, startChar, i - startChar);
} else {
s.append(cb, startChar, i - startChar);
str = s.toString();
}
nextChar++;
if (c == '\r') {
skipLF = true;
}
return str;
}
if (s == null)
s = new StringBuffer(defaultExpectedLineLength);
s.append(cb, startChar, i - startChar);
}
}
}
[解决办法]
是个标签，
break charLoop; //就是执行流程跳到标签定义的地方
[解决办法]
类似c++中的 goto 跳出循环 跳转到标签处继续做
