数据结构 枚举

`public enum ColorEnum {
    RED,BLACK,GREEN;
}
`

public class App {
    public static void main(String[] args){
        System.out.println(2); System.out.println(ColorEnum.RED);
        eachEnum();
    }

    public static void printColor(ColorEnum colorEnum)
    {switch(colorEnum){ case RED:
        System.out.println("这是一个红色");

        break;
        case GREEN:
            System.out.println("这是一个绿色");
            break;
        default:
            System.out.
                    println("位置颜色");
            break;
    }}

        private static void eachEnum() {
        ColorEnum[] arrs=ColorEnum.values();

            for (ColorEnum item:arrs)
            { System.out.println(item);
            }
        }}
        
}

for (ColorEnum item:arrs)
            { int enumIdx=item.
System.out.println(item);
            }

  private static void eachEnum() {
        ColorEnum[] arrs=ColorEnum.values();

            for (ColorEnum item:arrs)
            { int enumIdx=item.ordinal();
                System.out.println(item+":"+enumidx);

            }
        }

`private static void eachEnum()
{ColorEnum[] arrs=ColorEnum.values();
for(ColorEnum item:arrs)
{System.out.println(item);}
}
`

public class App {
    public static void main(String[] args){
         eachEnum();}
    private static void eachEnum()
    {ColorEnum[] arrs=ColorEnum.values();
        for(ColorEnum item:arrs)
        {System.out.println(item);}
    }

}




    public static void printColor(ColorEnum colorEnum)
    {switch(colorEnum){ case RED:
        System.out.println("这是一个红色");

        break;
        case GREEN:
            System.out.println("这是一个绿色");
            break;
        default:
            System.out.
                    println("位置颜色");
            break;
    }}

     }

  private static void eachEnum()
    {ColorEnum[] arrs=ColorEnum.values();
        for(ColorEnum item:arrs)
        {System.out.println(item);}
    }

public class App {
    public static void main(String[] args){
         eachEnum();}
    private static void eachEnum()
    {ColorEnum[] arrs=ColorEnum.values();
        for(ColorEnum item:arrs)
        {System.out.println(item);}
    }






    public static void printColor(ColorEnum colorEnum)
    {switch(colorEnum){ case RED:
        System.out.println("这是一个红色");

        break;
        case GREEN:
            System.out.println("这是一个绿色");
            break;
        default:
            System.out.
                    println("位置颜色");
            break;
    }}

     }

`public class App {
    public static void main(String[] args){
          String color="RED";ColorEnum.valueOf(color); printColor(color);}
    

    private static void eachEnum()
    {ColorEnum[] arrs=ColorEnum.values();
        for(ColorEnum item:arrs)
        {int enumIdx=item.ordinal();
            System.out.println(item+":"+enumIdx);}
    }





    public static void printColor(ColorEnum colorEnum)
    {switch(colorEnum){ case RED:
        System.out.println("这是一个红色");

        break;
        case GREEN:
            System.out.println("这是一个绿色");
            break;
        default:
            System.out.
                    println("位置颜色");
            break;
    }}

     }
`

import java.util.List；public class LambdaTest{
   public static void main(String[] args)
{List list=Arrays.asList("Java","MySQL","Lambda","Spring");
for(String item:list)
{System.out.println(item);}
System.out.println();
}
}

`
import java.util.Arrays;
import java.util.List;
public class LambdaTest{
    public static void main(String[] args)
    {List list= Arrays.asList("Java","MySQL","Lambda","Spring");
        for(String item:list)
        {System.out.println(item);}
        System.out.println();
    }
}
`

import java.util.Arrays;
import java.util.List;
public class LambdaTest{
    public static void main(String[] args)
    {List list= Arrays.asList("Java","MySQL","Lambda","Spring");
        for(String item:list)
        {System.out.println(item);}
        System.out.println();
List.forEach((item)->
{System.out.println(item);});
    }
}

    public static void main(String[] args){
          String color="RED";ColorEnum.valueOf(color);  

    private static void eachEnum()
    {ColorEnum[] arrs=ColorEnum.values();
        for(ColorEnum item:arrs)
        {int enumIdx=item.ordinal();
            System.out.println(item+":"+enumIdx);}
    }





    public static void printColor(ColorEnum colorEnum)
    {switch(colorEnum){ case RED:
        System.out.println("这是一个红色");

        break;
        case GREEN:
            System.out.println("这是一个绿色");
            break;
        default:
            System.out.
                    println("位置颜色");
            break;
    }}

     }

import java.util.Arrays;
import java.util.List;
public class LambdaTest{
    public static void main(String[] args)
    {List list= Arrays.asList("Java","MySQL","Lambda","Spring");
        for(String item:list)
        {System.out.println(item);}
        System.out.println();
        list.forEach((item)->
        {System.out.println(item);});
    }
}

import java.util.Arrays;
import java.util.List;
public class LambdaTest{
    public static void main(String[] args)
    {List list= Arrays.asList("Java","MySQL","Lambda","Spring");
        for(String item:list)
        {System.out.println(item);}
        System.out.println();
        list.forEach((String item)->
        {System.out.println(item);});
        System.out.println();
        list.forEach(item->System.out.println(item));
    }
}