JAVA三种实现单例模式方法（三）：枚举式实现单例设计模式

package instance.enumStyle;

public class InstanceEnumStyle {
	
	private InstanceEnumStyle() {}
	
	public static InstanceEnumStyle getInstance() {
		return Singleton.INSTANCE.getSingle();
	}
	
	private static enum Singleton {
		INSTANCE;
		
		private InstanceEnumStyle instance;
		
		private Singleton () {
			instance = new InstanceEnumStyle();
		}
		
		public InstanceEnumStyle getSingle() {
			return instance;
		}
	}
	
	public static void main(String[] args) {
		for (int i = 0; i < 3; i++) {
			new Thread(new Runnable() {
				@Override
				public void run() {
					InstanceEnumStyle instanceEnumStyle = InstanceEnumStyle.getInstance();
					System.out.println("hashCode:" + instanceEnumStyle.hashCode());
				}
			}).start();
		}
	}

}

测试结果：

hashCode:1575346308
hashCode:1575346308
hashCode:1575346308

更多内容：

https://www.cnblogs.com/linjiaxin/p/7923135.html