How to understand for in java

java keyword for: a keyword for loop control, which can be used to control statement loops.

1. The usual format is: for (initialization; control statement; control variable regulation) {loop statement}.

2. The initialization part of the control variables can be omitted, or many variables can be initialized. For example:

for(;i<100;i++)

and

for(int i=0,j=0,k=0;i<10;i++)

3. The control variable adjustment part can also be omitted, provided that you can ensure that the loop statement is not an infinite loop. For example:

for(;i<10;){i++;}

4. If the loop statement has only one sentence, you can omit the braces, such as:

for(;i<10;i++)
System.out.println("xx");

5. Sometimes we can use it for delay without loop body. For example:

for(int i=0;i<100000000;i++);

6, for certain conditions can be used interchangeably with while. For example:

while(i<100)===>for(;i<100;)

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