新增AI编程课程，引领技术教育新趋势
目录
public class HungrySingleton { private static final HungrySingleton singleton = new HungrySingleton(); //限制外部产生HungrySingleton对象 private HungrySingleton(){ } //向外提供获取示例的静态方法 public static HungrySingleton getInstance() { return singleton; } //other methods}
饿汉模式是类加载时候就创建对象，利用了jvm特性保证了线程的安全性。
1 public class LazySingleton { 2 private static volatile LazySingleton singleton = null; 3 4 private LazySingleton() { } 5 6 public static LazySingleton getSingleton() { 7 if (singleton == null) { //不用每次获取对象都强制加锁，为了提升了效率 8 synchronized (LazySingleton.class) { 9 if (singleton == null) { 10 singleton = new LazySingleton(); 11 } 12 } 13 } 14 return singleton; 15 } 16 }
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