一、懒汉模式
public class LazySingleton {
/**
* * 构造函数私有化
*/
//懒汉模式
private LazySingleton() {
}
private static LazySingleton singleton;
public static LazySingleton getInstance() {
if (singleton == null) {
return new LazySingleton();
}
return singleton;
}
二、饿汉模式
public class HungrySingleton {
//饿汉模式-加载慢，运行快，线程安全
//单例模式Sinletion
/**
* * 构造函数私有化
*/
private HungrySingleton() {
}
private static HungrySingleton hungrySingleton = new HungrySingleton();
public static HungrySingleton getInstance() {
return hungrySingleton;
}
}
