The switch statement for the Java basic syntax

A switch statement consists of a control expression and multiple case labels.

The types supported by the switch control expressions are byte, short, char, int, enum (Java 5), String (Java 7).

The Switch-case statement can be fully interoperable with the If-else statement, but generally, the Switch-case statement executes more efficiently.

Default is executed when the current switch cannot find a matching case. Default is not a must.

Once the case is matched, the subsequent program code is executed sequentially, regardless of whether the following case matches until abreak is encountered.

1. Examples of enum types:

1  Public classTestswitch {2  3     Static enumE {4 A, B, C, D5     }6  7      Public Static voidMain (String args[]) {8E e =e.b;9         Switch(e) {Ten          CaseA: OneSystem.out.println ("A"); A              Break; -          CaseB: -System.out.println ("B"); the              Break; -          CaseC: -System.out.println ("C"); -              Break; +          CaseD: -System.out.println ("D"); +              Break; A         default: atSYSTEM.OUT.PRINTLN (0); -         } -     } -}

2. The use of break statements: output the number of days of a month in a given year

int year = 2018;
intMonth = 8;intDay = 0;Switch(month) { Case1: Case3: Case5: Case7: Case8: Case10: Case12: Day= 31;  Break; Case2: Day= 28;  Break; Case4: Case6: Case9: Case11: Day= 30;  Break;} System.out.println (day);

The switch statement for the Java basic syntax