The first small experience of the three major cycles----Java

The three major cycles of Java include while 、、、 does while 、、、 for

(1) Grammatical differences:

While loop

while (loop condition) { Cyclic operation (body) }

Do and loop

bo= Cyclic operation (body) }while (cyclic conditions);

For loop

for (initialize; loop condition; iteration) { Cyclic operation (body) }

(2) Order of execution:

While loop: first judgment after execution

Do and loop: Judge after first execution

For loop: first judgment after execution

(3) Applicable situation:

When the number of cycles is determined, the for loop is usually used;

When the number of cycles is uncertain, the while loop or do While loop is usually selected;

Note: 1, the code indentation, to have a level, to do a good programmer;

2, the circulation can be normal exit, to avoid the death cycle;

3, the loop variable can have multiple

4, no matter which cycle, there are essential 4 parts: The initial part, the cycle condition, the loop body, the iteration part.

The first small experience of the three major cycles----Java