代码拉取完成,页面将自动刷新
同步操作将从 帝八哥/JavaBooks 强制同步,此操作会覆盖自 Fork 仓库以来所做的任何修改,且无法恢复!!!
确定后同步将在后台操作,完成时将刷新页面,请耐心等待。
单例就不多说了
public class Singleton {
private static Singleton instance = new Singleton();
private Singleton(){}
public static Singleton getInstance() {
return instance;
}
}
class Singleton {
private static Singleton instance = null;
static {
instance = new Singleton();
}
private Singleton() {}
public static Singleton getInstance() {
return instance;
}
}
class Singleton {
private static Singleton instance = null;
private Singleton(){}
public static Singleton getInstance() {
if (instance == null){
instance = new Singleton();
}
return instance;
}
}
class Singleton {
private static Singleton instance = null;
private Singleton() {
}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
class Singleton {
private static volatile Singleton instance = null;
private Singleton() {
}
public static Singleton getInstance() {
if (instance == null) {
synchronized (Singleton.class) {
if (instance == null) {
instance = new Singleton();
}
}
}
return instance;
}
}
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