Java selection structure

Basic if selection structure: situations where a single or combined condition can be handled

if (condition) {--> result must be a Boolean value

Suggested omitting {} when there is only one statement in code block

}

IF-ELSE selection structure: Can handle simple conditional branching situation

if () {

Code Block 1

}else{

Code Block 2

}

Multiple if selection structure: A conditional branching condition that can handle continuous intervals

if (condition 1) {

Code Block 1

}else if (condition 2) {

Code Block 2

}else{

Code block 3

}

Nested IF selection structure: can handle complex conditional branching situations

if (condition 1) {

if (condition 2) {//code block 1

}else{//Code 2

}else{//Code 3

}

}

Switch selection structure: Multiple branches and condition judgment is the case of equivalence judgment

switch (expression)--integer or character {

case constant 1;  Statement Break

case constant 2;  Statement Break

......

default--> if no matching value is found

Statement

Break

}

Note: Break cannot be omitted, constants cannot be the same, expressions cannot be strings

The similarities and differences between the multiple if selection structure and the switch selection structure:

The same point: all structures used to handle multi-branch conditions

Different points:

Switch selection structure: can only handle the condition of the equivalent condition judgment, and the condition must be an integer or character type variable

Multi-Select structure: No switch-selection structure, especially when a variable is in a contiguous state

Java selection structure