java continue break 关键字 详解 区别 用法 标记 标签 使用 示例 联系
本文关键词:
java continue break 关键字 详解 区别 用法 标记 标签 使用 示例 联系 跳出循环 带标签的continue和break 嵌套循环 深入continue break 跳出双层循环 goto替代
continue和break都用来中断循环,但是中断内容不同
break是跳出循环, continue是跳出当次循环
for (int i = 0; i < 6; i++) { System.out.println(i);
if (3 == i) {
break;
}
} System.out.println("++++++++++++++++"); for (int i = 0; i < 6; i++) { System.out.println(i);
if (3 == i) {
continue;
}
}
aaarticlea/png;base64,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" alt="" />
从结果也可以看得出来:break跳出当前循环,continue跳出当次循环
详细说明:
break在循环块中的作用是跳出当前正在循环的循环体
continue用于结束循环体中当次循环其后语句的执行,并跳回循环程序块的开头执行下一次循环
如果是多层循环,原理仍旧相通,break跳出内层正在循环的循环体,continue跳回内层循环的开头
也就是说多层循环下,break和continue仍旧是控制当前循环,并不是所有
for (int i = 0; i < 6; i++) { for (int j = 0; j < 6; j++) {
if (2 == j) {
break;
}
System.out.print(i + "----->" + j+" ");
}
System.out.println();
}
内层循环直接跳出中断掉,外层循环依旧按顺序执行
aaarticlea/png;base64,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" alt="" />
for (int i = 0; i < 6; i++) { for (int j = 0; j < 6; j++) {
if (2 == j) {
continue;
}
System.out.print(i + "----->" + j+" ");
}
System.out.println();
}
外层循环依旧,内层循环仅仅跳过了j=2的值,其他的值依旧正常循环
aaarticlea/png;base64,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" alt="" />
如果带标签,那么break 和continue生效的循环就不再是当前了,而是标签指定的
label:
for (int i = 0; i < 6; i++) { for (int j = 0; j < 6; j++) {
if (2 == j) {
break label;
}
System.out.print(i + "----->" + j+" ");
}
System.out.println();
}
直接break 标签的循环,执行了两次就再也没有输出了
aaarticlea/png;base64,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" alt="" />
label:
for (int i = 0; i < 6; i++) { for (int j = 0; j < 6; j++) {
if (2 == j) {
continue label;
}
System.out.print(i + "----->" + j+" ");
}
System.out.println();
}
continue跳出当次循环,继续标签处代表的循环进行继续执行,所以下面的System.out.println();根本都执行不到的
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