Java lesson Three: branching structures

1.if can not be added after {}, but not recommended, prone to misunderstanding
2. Write the program first anti-stud test, and then write logic, otherwise it will be wrong
3.if: A branch
if else: two branches
if...else If ...: multiple branches (end without else)
4. Note the curly braces
5.switch-case (compared to else if):(1). Only integer data types can be judged
(2). can only do equivalent comparison, can not do more than less than the comparison
(3). Dominoes, must use break.
6.break: Break, just like a wall.
7. Multiple empty case are used side by side, representing multiple case, performing the same operation.

Java lesson Three: branching structures