int m=d.getNum();
array[i].setNum(array[i].getNum() + m);和
array[i].setNum(array[i].getNum() + d.getNum);这两个语句运行之后d中Num的值都改变了,为什么啊?不是说第一个只是传值,第二个传地址 吗?求教,谢谢!3Q
array[i].setNum(array[i].getNum() + m);和
array[i].setNum(array[i].getNum() + d.getNum);这两个语句运行之后d中Num的值都改变了,为什么啊?不是说第一个只是传值,第二个传地址 吗?求教,谢谢!3Q
1、d 的类型定义中 getNum()是怎么写的
2、array[] 的类型是不是 d.class 的数组?
3、array[i] 是不是等于 d ?
import java.util.*;public class Disk {
private int ID; private String name; private double price; private int num; private Date time; public Disk(int id, String name, double price, int num) {
super();
ID = id;
this.name = name;
this.price = price;
this.num = num;
} public int getID() {
return ID;
} public void setID(int id) {
ID = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getNum() {
return num;
} public void setNum(int num) {
this.num = num;
} public double getPrice() {
return price;
} public void setPrice(double price) {
this.price = price;
} public Date getTime() {
return time;
} public void setTime(Date time) {
this.time = time;
} public void print() { }}array[]和d都是Disk的对象