Java Series Learning (v)-Process Control statements

1. Sequential structure

1.if statements

(1) Legend

(2) Three formats

A: Format 1

B: Format 2

C: Format 3

2.swich statements

Legend:

Format:

"Note" Input can be an enumeration after Byte,short,int,char;jdk5; JDK7 can be a string later;

3. Looping statements

Legend:

(1) For loop

(2) While loop

Legend:

Usage:

(3) Do...while cycle

Legend:

Usage:

(4) difference between for and while

A: the difference in use

The control condition variable for the For statement can no longer be used after the loop has ended, while the while continues to use the

B: The difference in understanding

"For a range of judgments, while suitable for loops with ambiguous times"

(5) The difference of three kinds of cycles

A:do...while Loop performs at least one loop body

The b:for and while must first determine if the condition is true before deciding whether to execute the loop

4. Controlling Jump Statements

(1) Break: Meaning of the Interruption

A: Used in loops and switch statements, leaving the sub-scenario meaningless

B: function:

"A. Jumping out of a single-layer loop"

"B. Jumping out of a multilayer loop, requiring a mate of a label statement"

(2) Continue: Continue

Function: Jump out of a loop and go to the next execution

(3) Return: Back

A: Used to end the execution of the method

B: Must have encountered return, the program will not be executed back

Java Series Learning (v)-Process Control statements