JAVA枚举类型实用代码示例。

刚学枚举类型是总觉的枚举类型似乎多此一举，一直在想枚举类型有什么意义。

看到网络上很多枚举类型的例子，觉的很适合颜色调配这个案例，感觉枚举最大的意义是可以像对象一样操作。

自己结合枚举的优点写了一个实用的例子，代码会优雅和精简了许多，供参考。

package utils;
public enum LxzColor{
	Red(255,0,0),
	Green(0,255,0),
	Blue(0,0,255),
	Black("#000000"),
	Purple("#6F00D2"),
    Yello("#F9F900"),
    White("#FFFFFF");
	
	//模式RGB色，HTML色
	enum ColorAdapter{
		All{
			public String toString(LxzColor clr) {
				return "["+"htmlcode="+clr.htmlcode+"  RGB={"+clr.r+","+clr.g+","+clr.b+","+"}"+"]";		
			   }
		},
		RGB{
			public String toString(LxzColor clr) {
				 return "["+clr.r+","+clr.g+","+clr.b+"]";
			   }
		},
		HTML{
			public String toString(LxzColor clr) {
				 return clr.htmlcode;
			   }
		};
		
		public String toString(LxzColor clr) {
			return "["+"htmlcode="+clr.htmlcode+"  RGB={"+clr.r+","+clr.g+","+clr.b+","+"}"+"]";
	   }
	}

	
	String htmlcode;
	int r;
	int g;
	int b;
	private LxzColor(String htmlcolor)
	{
		htmlcode=htmlcolor;
		r=Integer.valueOf(""+htmlcolor.charAt(1)+htmlcolor.charAt(2),16);
		g=Integer.valueOf(""+htmlcolor.charAt(3)+htmlcolor.charAt(4),16);
		b=Integer.valueOf(""+htmlcolor.charAt(5)+htmlcolor.charAt(6),16);

	}
	private LxzColor(int r,int g,int b)
	{
		this.r=r;
		this.g=g;
		this.b=b;
		String $r=String.valueOf(Integer.toHexString(r));
		$r=$r.length()==1?0+$r:$r;
		String $g=String.valueOf(Integer.toHexString(g));
		$g=$g.length()==1?0+$g:$g;
		String $b=String.valueOf(Integer.toHexString(b));
		$b=$b.length()==1?0+$b:$b;
		htmlcode=("#"+$r.toUpperCase()+$g.toUpperCase()+$b.toUpperCase());	

	}
	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return super.toString();
	}
	
	public String toString(ColorAdapter type) {
		// TODO Auto-generated method stub
		return type.toString(this);
	}
}
 

package utils;

import utils.LxzColor.ColorAdapter;


public class dotest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println(LxzColor.values());
		
		//打印
		System.out.println(LxzColor.Black);
		System.out.println(LxzColor.valueOf("Red"));
		System.out.println(LxzColor.valueOf(LxzColor.Blue.toString()));
		System.out.println("----------------------");
		
		for(int i=0;i<LxzColor.values().length;i++)
		{
			System.out.println("序列数"+LxzColor.values()[i].ordinal());
			System.out.println(LxzColor.values()[i]);
			System.out.println(LxzColor.values()[i].toString(ColorAdapter.RGB));
			System.out.println(LxzColor.values()[i].toString(ColorAdapter.HTML));
			System.out.println(LxzColor.values()[i].toString());
			System.out.println("----------------------");
		}	
	}
}

 

 

输出结果

[Lutils.LxzColor;@61de33
Black
Red
Blue
----------------------
序列数0
Red
[255,0,0]
#ff0000
Red
----------------------
序列数1
Green
[0,255,0]
#00ff00
Green
----------------------
序列数2
Blue
[0,0,255]
#0000ff
Blue
----------------------
序列数3
Black
[0,0,0]
#000000
Black
----------------------
序列数4
Purple
[111,0,210]
#6F00D2
Purple
----------------------
序列数5
Yello
[249,249,0]
#F9F900
Yello
----------------------
序列数6
White
[255,255,255]
#FFFFFF
White
----------------------