一个枚举类实例

最新推荐文章于 2025-06-28 22:34:25 发布

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#java #enum #枚举

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本文探讨了枚举类如何实现抽象方法，并通过具体实例展示了枚举类的特性及其实现方式。枚举类不能继承其他类，其构造器默认为private，且非抽象枚举类默认使用final修饰。

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被枚举类继承的抽象方法:

public interface GenderDesc {
	void info();
}

枚举类

public enum UpmsResultConstant implements GenderDesc{


    FAILED(0, "failed"){
    	@Override
    	public void info() {
    		System.out.println("失败");
    	}
    },
    SUCCESS(1, "success"),

    INVALID_LENGTH(10001, "Invalid length"),

    EMPTY_USERNAME(10101, "Username cannot be empty"),
    EMPTY_PASSWORD(10102, "Password cannot be empty"),
    INVALID_USERNAME(10103, "Account does not exist"),
    INVALID_PASSWORD(10104, "Password error"),
    INVALID_ACCOUNT(10105, "Invalid account");//根据构造器定义,且必须在第一行显式累出,中间用英文逗号隔开,用分号结尾.

    public int code;

    public String message;

    UpmsResultConstant(int code, String message) { //构造器默认使用private修饰
        this.code = code;
        this.message = message;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }
    
    public void setMessage(String message) {
        this.message = message;
    }
    
	@Override
	public void info() {
		// TODO Auto-generated method stub		
	}
}

测试类

public class Test {
	public static void main(String[] args) {
		for (UpmsResultConstant upm : UpmsResultConstant.values()) {
			upm.info();
			System.out.print(upm.getCode()+":"+upm.message);
			System.out.print("   "+upm.toString());
			System.out.println("   "+upm.ordinal());
			UpmsResultConstant u = UpmsResultConstant.valueOf(UpmsResultConstant.class, "FAILED");
		}
	}
}

运行结果

失败
0:failed   FAILED   0
1:success   SUCCESS   1
10001:Invalid length   INVALID_LENGTH   2
10101:Username cannot be empty   EMPTY_USERNAME   3
10102:Password cannot be empty   EMPTY_PASSWORD   4
10103:Account does not exist   INVALID_USERNAME   5
10104:Password error   INVALID_PASSWORD   6
10105:Invalid account   INVALID_ACCOUNT   7