java 枚举类型

public enum Tenum {
    None(1),ByteArray(2),List(3),Map(4);
    private int id;
    private Tenum(int id){
        this.id=id;
    }
    
    public static Tenum getById(int id){
        for(Tenum t:values()){
            if(t.id==id){
                return t;
            }
        }
        return null;
    }
}

import org.junit.Test;

public class testEnum {

        @Test
        public void tEnum(){
            System.out.println(Tenum.getById(1));
            System.out.println(Tenum.getById(2));
            System.out.println(Tenum.getById(3));
            System.out.println(Tenum.getById(4));
        }
}