Java Control statement -- switch statement and modify witch statement

Java Control statement -- switch statement and modify witch statement

The equivalent judgment of the above if statement can be replaced by switch.

Note that break is usually added after each case, indicating that the current case has been executed; prevent case penetration, that is, continue to execute the case until the break exists.

The following example uses case penetration in turn.

[Example]

New Features of JDK7.0: enhanced switch

Before JDK 7, switch (expression ){......}, The expression result can only be int (which can be converted to byte, short, and char of int), enumeration type.

But in JDK 7, the expression result can also beString.

(Ps: automatic type conversion: small data types can be automatically converted to large data types. Byte (1 byte) → short (2 bytes) → int (4 bytes ).)