java枚举实例

直接上代码

 

/**
 * 
 * 〈枚举测试〉<br> 
 *
 * 1 枚举构造
 * 2 枚举实现接口
 * 3 枚举使用
 *
 */
public class EnumExample {

    public static void main(String[] args) {
        Signal[] s = Signal.YELLOW.values();
        
        System.out.println("序号");
        for (Signal ss : s) {
            System.out.print(ss.ordinal()+"\t");
        }
        System.out.println();System.out.println("值");
        for (Signal ss : s) {
            System.out.print(ss.getCode()+"\t");
        }
        System.out.println();System.out.println("变量名");
        for (Signal ss : s) {
            System.out.print(ss.name()+"\t");
        }
        
        // 运行异常：不需要try
        throw new RuntimeException("");
    }
    
    /**
     * code 接口
     */
    interface CodeFC {
        int getCode();
        void setCode(int code);
    }
    
    /**
     * 枚举定义
     */
    enum Signal implements CodeFC {
        GREEN(1), YELLOW(2), RED(3);

        private int code;

        Signal(int i) {
            this.code = i;
        }

        public int getCode() {
            return code;
        }

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