7ステップで理解するJavaでの列挙型／enum使用法：【改訂版】Eclipseではじめるプログラミング（21）（3/3 ページ）

package sample21;
 
public class EnumJapaneseMonthList {
    enum Month {
        JANUARY("睦月"),
        FEBRUARY("如月"),
        MARCH("弥生"),
        APRIL("卯月"),
        MAY("皐月"),
        JUNE("水無月"),
        JULY("文月"),
        AUGUST("葉月"),
        SEPTEMBER("長月"),
        OCTOBER("神無月"),
        NOVEMBER("霜月"),
        DECEMBER("師走");
  
        private String name;
        Month(String name) { this.name = name; }
        public String getName() { return name; }
    }
    public void exec() {
        for (Month m : Month.values()) {
          System.out.println(m + ":" + m.getName());
        }
    }
    public static void main(String[] args) {
      EnumJapaneseMonthList app = new EnumJapaneseMonthList();
      app.exec();
    }
}

package sample21;
 
import java.util.EnumMap;
 
public class EnumMapMonthList {
    private enum Month {
      JANUARY, FEBRUARY, MARCH, APRIL,
      MAY, JUNE, JULY, AUGUST,
      SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER;
    }
    private EnumMap<Month, Integer> monthMap;
  
    public EnumMapMonthList() {
        monthMap = new EnumMap<Month, Integer>(Month.class);
        monthMap.put(Month.JANUARY, 1);
        monthMap.put(Month.FEBRUARY, 2);
        monthMap.put(Month.MARCH, 3);
        monthMap.put(Month.APRIL, 4);
        monthMap.put(Month.MAY, 5);
        monthMap.put(Month.JUNE, 6);
        monthMap.put(Month.JULY, 7);
        monthMap.put(Month.AUGUST, 8);
        monthMap.put(Month.SEPTEMBER, 9);
        monthMap.put(Month.OCTOBER, 10);
        monthMap.put(Month.NOVEMBER, 11);
        monthMap.put(Month.DECEMBER, 12);
    }
    public void exec() {
        System.out.println("2011年");
        for (Month m : Month.values()) {
            String s = monthMap.get(m) + "月";
            switch (m) {
            case FEBRUARY:
                s = s + ":" + m + "(28日)";
                break;
            case APRIL:
            case JUNE:
            case SEPTEMBER:
            case NOVEMBER:
                s = s + ":" + m + "(30日)";
                break;
            case JANUARY:
            case MARCH:
            case MAY:
            case JULY:
            case AUGUST:
            case OCTOBER:
            case DECEMBER:
                s = s + ":" + m + "(31日)";
                break;
            }
            System.out.println(s);
        }
    }
    public static void main(String[] args) {
        EnumMapMonthList app = new EnumMapMonthList();
        app.exec();
    }
}

package sample21;
 
import java.util.ArrayList;
import java.util.List;
 
public class ArrowKeysSample {
    class ArrowKeys {
        public static final int UP = 0x01;
        public static final int RIGHT = 0x02;
        public static final int DOWN = 0x04;
        public static final int LEFT = 0x08;
    }
  
    public void exec() {
        List<Integer> keys = new ArrayList<Integer>();
        keys.add(ArrowKeys.UP);
        keys.add(ArrowKeys.RIGHT);
        keys.add(ArrowKeys.UP+ArrowKeys.RIGHT);
        keys.add(ArrowKeys.DOWN);
        keys.add(ArrowKeys.UP+ArrowKeys.DOWN);
        keys.add(ArrowKeys.UP+ArrowKeys.RIGHT + ArrowKeys.DOWN+ArrowKeys.LEFT);
        for (int e : keys) {
            System.out.print(e + ":");
            if ((e & ArrowKeys.UP) != 0) {
                System.out.print("UP, ");
            }
            if ((e & ArrowKeys.RIGHT) != 0) {
                System.out.print("RIGHT, ");
            }
            if ((e & ArrowKeys.DOWN) != 0) {
                System.out.print("DOWN, ");
            }
            if ((e & ArrowKeys.LEFT) != 0) {
                System.out.print("LEFT, ");
            }
                System.out.println("");
        }
    }
    public static void main(String[] args) {
        ArrowKeysSample app = new ArrowKeysSample();
        app.exec();
    }
}

package sample21;
 
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
 
public class EnumArrowKeysSample {
    enum ArrowKeys { UP, RIGHT, DOWN, LEFT }
 
    public void exec() {
        List<EnumSet<ArrowKeys>> keys = new ArrayList<EnumSet<ArrowKeys>>();
        keys.add(EnumSet.of(ArrowKeys.UP));
        keys.add(EnumSet.of(ArrowKeys.RIGHT));
        keys.add(EnumSet.of(ArrowKeys.UP, ArrowKeys.RIGHT));
        keys.add(EnumSet.of(ArrowKeys.DOWN));
        keys.add(EnumSet.of(ArrowKeys.UP, ArrowKeys.DOWN));
        keys.add(EnumSet.allOf(ArrowKeys.class));
        for (EnumSet<ArrowKeys> e : keys) {
            System.out.print(e + ":");
            if (e.contains(ArrowKeys.UP)) {
                System.out.print("UP, ");
            }
            if (e.contains(ArrowKeys.RIGHT)) {
                System.out.print("RIGHT, ");
            }
            if (e.contains(ArrowKeys.DOWN)) {
                System.out.print("DOWN, ");
            }
            if (e.contains(ArrowKeys.LEFT)) {
                System.out.print("LEFT, ");
            }
            System.out.println("");
        }
    }
    public static void main(String[] args) {
        EnumArrowKeysSample app = new EnumArrowKeysSample();
        app.exec();
    }
}