Explanation
In Java, we often have to traverse the data and process
the data . In the data processing, we often use two keywords, one is continue and the other is break. The meaning of the
continue keyword is: end the current loop and continue the next loop . The meaning of the
break keyword is: end the loop .
Not much to say directly on the code
continue
public class Demo2 {
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
if (i == 3) {
System.out.println("此处i==3:--->跳过此次循环，继续下次循环！");
continue;
}
System.out.println("i = " + i);
}
}
}
The above code is very simple, a for loop from 0-5,
when i == 3, we jump out of the loop, that is, the following code is not executed, and continue to the next loop.
operation result:
i = 0
i = 1
i = 2
此处i==3:--->跳过此次循环，继续下次循环！
i = 4
我们可以看到i = 3没有打印
break
public class Demo3 {
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
if (i == 3) {
System.out.println("此处i==3:--->结束循环！");
break;
}
System.out.println("i = " + i);
}
}
}
The above result is also a for loop of 0-5. When i == 3, we use break to modify and end the loop!
operation result
i = 0
i = 1
i = 2
此处i==3:--->结束循环！
很明显，程序进行到i == 3 时就停止了。
The above is the most basic use of continue and break, and friends should use it according to the specific situation in the project.
We also have a situation in the project: traversal needs to be nested, that is, there is also a for loop in the for loop. Let us study this situation together:
public class Demo4 {
public static void main(String[] args) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 4; j++) {
if (i == j) {
continue;
}
System.out.println("i = " + i + ":j = " + j);
}
}
}
}
Two for loops, the outer for loop is from 0-3, the inner for loop is from 0-5, when i == j,
we end this loop and continue to the next loop, but at this time the end is the inner Layer or outer layer? ? ?
Little friends can think about it first and then look at the results:
i = 0:j = 1
i = 0:j = 2
i = 0:j = 3
i = 1:j = 0
i = 1:j = 2
i = 1:j = 3
i = 2:j = 0
i = 2:j = 1
i = 2:j = 3
从运行结果中我们可以清楚的看出，结束的是内层循环，就近原则嘛！
但是如果实际情况需要，当i == j时我们就想让外层询还结束怎么办？
此时我们可以给外层循环起一个名字，然后使用continue的时候在他后面跟上这个名字,代码如下：
public class Demo4 {
public static void main(String[] args) {
outF:
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 4; j++) {
if (i == j) {
continue outF;
}
System.out.println("i = " + i + ":j = " + j);
}
}
}
}
The meaning here is to tell the computer: when i == j, I want to end the outer loop and continue the next loop
.
i = 1:j = 0
i = 2:j = 0
i = 2:j = 1
The operation of break is similar to continue, and it also supports the method of aliasing. Friends can try it by themselves!
