单例模式（饿汉模式、懒汉模式、DCL单例模式、枚举）

package bpj.singledistance; public enum EnumManger { SDCardManager(10) { @Override public EnumManger getSingle() { return SDCardManager; } } , HttpManager(1) { @Override public EnumManger getSingle() { return HttpManager; } }; private int type; public abstract EnumManger getSingle(); private EnumManger(int type) { this.type = type; } }