一、單例模式的寫法：

public class MyFactory {
    /**
     * 餓漢式
     */
    private static MyFactory instance = new MyFactory();
    
    private MyFactory(){
        
    }
    
    public static MyFactory getInstance(){
        return instance;
    }
}

public class MyFactory {
    
    /**
     * 懶漢式(要註意處理線程安全問題)
     
 
*/
    private static MyFactory instance;
    
    public static MyFactory getInstance(){
        if(instance == null){
            synchronized(MyFactory.class){
                if(instance == null){
                    instance = new MyFactory();
                }
            }
        }
        
        
 
return instance;
    }
}

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java單例模式等一些程序的寫法....持續更新...