Java枚举类使用方式

深碍√TFBOYSˉ_ 2023-10-05 18:31 3阅读 0赞

Java枚举类使用方式

单枚举定义 ：

/**
     * 
     * @title: 单枚举定义
     * @author: wll
     * @since: 2021-1-27 14:47:54
     */
    public enum JudgeEnum {
    	TRUE, FALSE;
    
    	public static void main(String[] args) {
    		System.out.println(JudgeEnum.TRUE);// TRUE
    		System.out.println(JudgeEnum.FALSE);// FALSE
    	}
    }

KEY,VAL枚举定义及使用：

/**
     * 
     * @title: KEY,VAL枚举定义及使用
     * @author: wll
     * @since: 2021-1-27 14:48:21
     */
    public enum ColorEnum {
    
    	RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
    
    	// 成员变量
    	private String name;
    	private Integer code;
    
    	// 构造方法
    	private ColorEnum(String name, Integer code) {
    		this.name = name;
    		this.code = code;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public Integer getCode() {
    		return code;
    	}
    
    	public void setCode(Integer code) {
    		this.code = code;
    	}
    
    	// 通过code获取name
    	public static String getNameByCode(Integer code) {
    		for (ColorEnum c : ColorEnum.values()) {
    			if (c.getCode() == code) {
    				return c.name;
    			}
    		}
    		return null;
    	}
    
    	// 通过name获取code
    	public static Integer getCodeByName(String name) {
    		for (ColorEnum c : ColorEnum.values()) {
    			if (c.getName() == name) {
    				return c.code;
    			}
    		}
    		return null;
    	}
    
    	public static void main(String[] args) {
    		System.out.println("Name-->" + ColorEnum.RED.getName());// Name-->红色
    		System.out.println("Code-->" + ColorEnum.RED.getCode());// Code-->1
    
    		System.out.println("getNameByCode-->" + ColorEnum.getNameByCode(2));// getNameByCode-->绿色
    		System.out.println("getCodeByName-->" + ColorEnum.getCodeByName("黄色"));// getCodeByName-->4
    	}
    
    }

混搭使用枚举的方式：

/**
     * 
     * @title: 混搭使用枚举的方式
     * @author: wll
     * @since: 2021-1-27 15:17:10
     */
    public interface CollectionEnum {
    
    	enum Judge implements CollectionEnum {
    		TRUE, FALSE
    	}
    
    	enum Color implements CollectionEnum {
    		red("红色", 1), green("绿色", 2), yello("黄色", 3);
    
    		private String name;
    		private Integer code;
    
    		private Color(String name, Integer code) {
    			this.name = name;
    			this.code = code;
    		}
    
    		public String getName() {
    			return name;
    		}
    
    		public void setName(String name) {
    			this.name = name;
    		}
    
    		public Integer getCode() {
    			return code;
    		}
    
    		public void setCode(Integer code) {
    			this.code = code;
    		}
    	}
    
    	public static void main(String[] args) {
    		System.out.println(Judge.TRUE);// TRUE
    		System.out.println(Color.red.getName());// 红色
    		System.out.println(Color.red.getCode());// 1
    	}
    
    }