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android单例模式怎么实现

小亿
110
2023-08-23 10:22:35
栏目: 编程语言
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在Android中,可以通过以下几种方式实现单例模式:

  1. 懒汉式
public class Singleton {
private static Singleton instance;
private Singleton() {}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
  1. 饿汉式
public class Singleton {
private static final Singleton instance = new Singleton();
private Singleton() {}
public static Singleton getInstance() {
return instance;
}
}
  1. 双重检查锁定
public class Singleton {
private volatile static Singleton instance;
private Singleton() {}
public static Singleton getInstance() {
if (instance == null) {
synchronized (Singleton.class) {
if (instance == null) {
instance = new Singleton();
}
}
}
return instance;
}
}
  1. 静态内部类
public class Singleton {
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton();
}
private Singleton() {}
public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}
}

以上是几种常见的Android中实现单例模式的方式,具体选择哪种方式取决于实际需求和性能要求。

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