单例模式

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常见的单例模式

懒汉式(不安全)

public class Singleton{    private Singletion（）{}    private static Singleton Instance;    public static Singeton getInstance(){        if(Instance==null){            Instance = new Singleton();        }        return Instance;    }}

懒汉式（安全低效率）

public class Singleton{    private Singletion（）{}    private static Singleton Instance;    public static Synchronizeed Singeton getInstance(){        if(Instance==null){            Instance = new Singleton();        }        return Instance;    }}

恶汉式

public class Singleton{    private Singletion（）{}    private static Singleton Instance = new Singleton（）;    public static Singeton getInstance(){        return Instance;    }}

懒汉式（双校验）

public class Singleton{    private Singletion（）{}    private static Singleton Instance;    public static Singeton getInstance(){        if(Instance==null){            Synchronizeed(Singleton.class){                if(Instance==null){                    Instance = new Singleton();                }            }        }        return Instance;    }}

懒汉式（静态式）

public class Singleton{    private Singletion（）{}    private static final class SingletonHolder {        private final Singleton instance = new Singleton();    }    public static Singeton getInstance(){        return SingletonHolder.instance;    }}

枚举

public enum Singleton{    Instance;    public void doMethod(){};}

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