my java enum class

最新推荐文章于 2025-12-11 22:46:37 发布

转载最新推荐文章于 2025-12-11 22:46:37 发布 · 907 阅读

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此博客展示了一个Java方向枚举类的实现。定义了东、西、南、北四个方向常量，包含构造方法和toString方法。还提供了一个解析字符串为方向对象的方法，若解析失败会抛出运行时异常，体现了Java类和异常处理的运用。

public class Direction
{
    public static final Direction East = new Direction("East");
    public static final Direction West = new Direction("West");
    public static final Direction North = new Direction("North");
    public static final Direction South = new Direction("South");

    private final String dirString;

    private Direction(String name)
    {
        dirString = name;
    }

    public String toString()
    {
        return dirString;
    }

    public static Direction parse(String ds)
    {
        try
        {
            Direction ret = null;
            Field[] fs = Direction.class.getFields();
            for (int i = 0; i < fs.length; i++)
            {
                Field f = fs[i];
                if (f.getType().getName().equals(Direction.class.getName()))
                {
                    if (f.getName().toUpperCase().equals(ds.toUpperCase()))
                    {
                        ret = (Direction) f.get(null);
                        break;
                    }
                }

            }
            return ret;
        }
        catch (Exception ex)
        {
            throw new RuntimeException(ds + " is a invalid direction enum string.");
        }
    }
}