java enumeration

An enumeration refers to a type consisting of a fixed set of constants

enum keyword enum

Benefits of using enums

1. Type Safety

2. Easy to enter

3. The code is clear

package cn.kgc.enumdemo2;
//define enumeration
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 junior programmer");
			break;
		case L2:
			System.out.println("L1: java senior programmer");
			break;
		case L3:
			System.out.println("L1:java architect");
			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("Your java programming level wants to reach (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("More practice!!!");
		}
	}
}