1、for循环
a b c
for(初始化表达式;布尔表达式;递增(或递减)表达式){
d
//循环体
}
执行过程:a为真：a->b->d->c->b->d->c,直到b为假，跳出for循环
for(;;){
}//死循环，与while(true){}等价
char ch = barcoad.charAt(i);//条码
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