在Java中,getInstance()方法是单例模式的核心,用于获取类的唯一实例。为了优化性能,可以采取以下策略:
public class Singleton {
private static Singleton instance;
private Singleton() {
// 构造函数私有化,防止外部实例化
}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
public class Singleton {
private static final Singleton instance = new Singleton();
private Singleton() {
// 构造函数私有化,防止外部实例化
}
public static Singleton getInstance() {
return instance;
}
}
public class Singleton {
private static volatile Singleton instance;
private Singleton() {
// 构造函数私有化,防止外部实例化
}
public static Singleton getInstance() {
if (instance == null) {
synchronized (Singleton.class) {
if (instance == null) {
instance = new Singleton();
}
}
}
return instance;
}
}
public class Singleton {
private Singleton() {
// 构造函数私有化,防止外部实例化
}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}
}
public enum Singleton {
INSTANCE;
// 添加其他方法
}
根据实际需求和场景,可以选择合适的优化策略。
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