【Java】单例设计模式Singleton

单例设计模式：singleton

解决的问题：

特点：

Java代码：

class  Recycle {
static int[] arr;
static String str;
//自己内部声明自己
private static Recycle recycle ;
//构造函数私有化
private Recycle(){
arr = new int[]{1,2,3};
}
//提供一个public方法，负责实例化自己
public static Recycle getInstance() {
if(recycle==null)
recycle = new Recycle();
return recycle;
}
}

public class Test0718_Singleton {
public static void main(String[] args)  {
//new Recycle();
System.out.println(Recycle.getInstance() == Recycle.getInstance());

Recycle.getInstance().str = "1111";
System.out.println(Recycle.getInstance().str);
}
}