Java Singleton模式 [英] Java Singleton Pattern
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问题描述
编辑:已回答 - 错误是方法不是静态
public class Singleton {
private static Singleton INSTANCE = new Singleton();
//私有构造函数阻止从其他类实例化
private Singleton(){}
public static Singleton getInstance(){
return INSTANCE;
}
}
我的问题是如何创建类的对象单击另一个类?
我尝试过:
Singleton singleton = new Singleton();
// error - constructor is private
Singleton singleton = Singleton.getInstance();
//错误 - 非静态方法无法从静态上下文中引用
什么是正确的代码?
谢谢,
Spencer
解决方案
<$ Singleton singleton = Singleton.getInstance(); p $ p>
是正确的方法。确保您的 getInstance()
方法确实是 static
。
由于您的 Singleton
实现远未安全 - 您的对象可以通过反射进行实例化,您可能需要基于 枚举
Edit: Answered - error was method wasn't static
I'm used the Singleton Design Pattern
public class Singleton {
private static final Singleton INSTANCE = new Singleton();
// Private constructor prevents instantiation from other classes
private Singleton() {}
public static Singleton getInstance() {
return INSTANCE;
}
}
My question is how do I create an object of class Singleton in another class?
I've tried:
Singleton singleton = new Singleton();
// error - constructor is private
Singleton singleton = Singleton.getInstance();
// error - non-static method cannot be referenced from a static context
What is the correct code?
Thanks, Spencer
解决方案
Singleton singleton = Singleton.getInstance();
is the correct way. Make sure your getInstance()
method is indeed static
.
Since your Singleton
implementation is far from being safe - your object can be instantiated via reflection, you may want to create a singleton based on enum
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