第三天单例设计模式

编写一个延迟加载的单例设计模式。

实现代码：：
public class BaseTestEight
{
public static void main(String[] args)
{
Apple greenApple=Apple.getInstance();
System.out.println(greenApple.getName()+" "+greenApple.getColer());
Apple redApple=Apple.getInstance();
redApple.setName("红苹果");
redApple.setColer("红色");
System.out.println(redApple.getName()+" "+redApple.getColer());
System.out.println(greenApple.getName()+" "+greenApple.getColer());
}
}


class Apple
{
private String name = "青苹果";
private String coler="青色";
public void setName(String name)
{
this.name=name;
}
public String getName()
{
return name;
}
public void setColer(String coler)
{
this.coler=coler;
}
public String getColer()
{
return coler;
}
private Apple(){}
    private static Apple app=null;
public static Apple getInstance()
{
if (app==null)
{
synchronized(Apple.class)
{
if (app==null)
{
app=new Apple();
}
}
}
return app;
}
}