java枚举

枚举指由一组固定的常量组成的类型

枚举关键字enum

使用枚举的好处

1.类型安全

2.易于输入

3.代码清晰

package cn.kgc.enumdemo2;
//定义枚举
public enum JavaGrade {
	L1,L2,L3
}

package cn.kgc.enumdemo2;

public class JavaStage {
	public void Stage(JavaGrade stage){
		switch (stage) {
		case L1:
			System.out.println("L1:java初级程序员");
			break;
		case L2:
			System.out.println("L1:java高级程序员");
			break;
		case L3:
			System.out.println("L1:java架构师");
			break;
		}
	}
}

package cn.kgc.enumdemo2;

import java.util.Scanner;

public class MyJavaStage {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		JavaStage javaStage=new JavaStage();
		System.out.println("你java编程的水平想达到(L1-L2-L3)");
		String stage=input.next();
		if(stage.equals("L1")){
			javaStage.Stage(JavaGrade.L1);
		}else if(stage.equals("L2")){
			javaStage.Stage(JavaGrade.L2);
		}else if(stage.equals("L3")){
			javaStage.Stage(JavaGrade.L3);
		}else{
			System.out.println("要多加练习！！！");
		}
	}
}