Java14新特性：Switch表达式
Java 14正式发布switch表达式特性。在之前的两个 Java 版本Java12，Java13，switch特性只是预览版。
新的switch表达式有助于避免一些bug，因为它的表达和组合方式更容易编写。
switch新的表达式有两个特点：
- 支持箭头表达式返回。
- 支持yied和return返回值。
Java 14之前switch语法
switch (season) { case SPRING: case AUTUMN: System.out.println("温暖"); break; case SUMMER: System.out.println("炎热"); break; case WINTER: System.out.println("寒冷"); break; }
Java 14 switch表达式
switch (season) {
case SPRING, AUTUMN -> System.out.println("温暖");
case SUMMER -> System.out.println("炎热");
case WINTER -> System.out.println("寒冷");
}
Java 14的switch表达式使用箭头表达时，不需要我们在每一个case后都加上break，减少我们出错的机会。
Java14之前switch语法返回值
String temperature ="";
switch (season) {
case SPRING:
case AUTUMN:
temperature = "温暖";
break;
case SUMMER:
temperature = "炎热";
break;
case WINTER:
temperature = "寒冷";
break;
default:
temperature = "忽冷忽热";
}
它不支持返回值，需要通过一个中间变量来返回。
Java14 switch表达式返回值
String temperature = switch (season) {
case SPRING, AUTUMN -> "温暖";
case SUMMER -> "炎热";
case WINTER -> "寒冷";
}
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