这个题让我更加明白了类创建对象的实质 代码中用到:1.对象作形参;2.对象作返回值 以下用代码具体分析: class Point1{ public double x; public double y; Point1(){} public Point1(double x,double y){ this.x=x; this.y=y; } public void show(){ System.out.println("x="+x+","+"y="+y)
假设有两个类:Dao 和 PersonDao,它们的代码如下: Dao: public class Dao<T> { private Class<T> clazz; T getId(Integer id){ return null; } void save(T entity){ } } PersonDao: public class PersonDao extends Dao<Person> { } Person: public class Person { priva