经验总结53-java枚举
使用java枚举代替字符串或静态变量。
颜色枚举类：
public enum ColorEnum {
RED, BLACK, GREE, BLUE
}
调用：
public static void main(String[] args) {
System.out.println(ColorEnum.RED.toString());
System.out.println(ColorEnum.RED.ordinal());
}
public enum ColorEnum {
RED(1),BLACK(2), GREE(3), BLUE(4);
private final intvalue;
public int getValue() {
return value;
}
ColorEnum(int value) {
this.value =value;
}
}
System.out.println(ColorEnum.RED.getValue());
for (ColorEnum item : ColorEnum.values()) {
System.out.println(item.getValue() + ":" + item.toString());
}
Stringvalue1="BLUE";
System.out.println(ColorEnum.valueOf(value1).ordinal());
int value2 = 2;
System.out.println(ColorEnum.values()[value2-1].toString());
ColorEnum value3 = ColorEnum.values()[value2- 1];
switch (value3) {
case RED:
System.out.println(ColorEnum.RED.getValue() + ":" + ColorEnum.RED.toString());
break;
case BLACK:
System.out.println(ColorEnum.BLACK.getValue() + ":" + ColorEnum.BLACK.toString());
break;
case GREE:
System.out.println(ColorEnum.GREE.getValue() + ":" + ColorEnum.GREE.toString());
break;
default:
System.out.println(ColorEnum.BLUE.getValue() + ":" + ColorEnum.BLUE.toString());
}