3.课后作业
public class Lei {
static int x=0;
//生成一个对象就自加加
public Lei()
{
x++;
}public static void main(String[] args)
{
Lei L1=new Lei();
Lei L2=new Lei();
Lei L3=new Lei();
Lei L4=new Lei();
Lei L5=new Lei();
Lei L6=new Lei();
Lei L7=new Lei();
System.out.println("创建对象数量"+x);
}
}