需要單例的類 SinletonObject
@AllArgsConstructor
public class SinletonObject {
private Integer id;
private String desc;
}
枚舉類實現(xiàn)單例
public enum SingletonEnum {
INSTANCE;
private SinletonObject instance;
SingletonEnum(){
System.out.println(" -new instance --");
instance = new SinletonObject(1,"hello");
}
public SinletonObject getInstance() {
return instance;
}
}
測試下
public class SingletonTest {
public static void main(String[] args) {
System.out.println(SingletonEnum.INSTANCE.getInstance());
System.out.println(SingletonEnum.INSTANCE.getInstance());
}
}
運行結(jié)果，只初始化了一次
-new instance --
com.river.face.Singleton.SinletonObject@65b54208
com.river.face.Singleton.SinletonObject@65b54208
