用Java写一个单例类。
答:
- 饿汉式单例
public class Singleton {
private Singleton(){}
private static Singleton instance = new Singleton();
public static Singleton getInstance(){
return instance;
}
}1234567
懒汉式单例
public class Singleton {
private static Singleton instance = null;
private Singleton() {}
public static synchronized Singleton getInstance(){
if (instance == null) instance = new Singleton();
return instance;
}
}
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