同步单例模式写法
2019-06-10 本文已影响0人
martingale
public class Singleton {
private static Singleton instance=new Singleton();
private Singleton() {
}
public static synchronized Singleton getInstance() {
return instance;
}
}
public class Singleton {
private static Singleton instance=null;
private Singleton() {
}
public static synchronized Singleton getInstance() {
if(instance==null) {
instance=new Singleton();
}
return instance;
}
}
public class Singleton {
private static volatile Singleton instance=null;
private Singleton() {
}
public static Singleton getInstance() {
if(instance==null) {
synchronized(Singleton.class) {
instance=new Singleton();
}
}
return instance;
}
}
