集合1 Collection(存储引用)
1，一个一个存储 Collection
一对一对存储Map
List 和 Set
Collection 的一些方法：
Collection ;自动装箱在集合中
存储在集合中对象都要重写equals 方法
it.hasnext 不会向下 移动，it.next 才会向下移动
add 重写了toString 方法
remove 也可以通过迭代器删除所有数据
删除推荐使用迭代器自身的方法删除！。
ArrayList 初始化容量10 增加扩容时则增加1.5倍
Vector 初始化容量为10 增大扩容则是增加2倍
Room
public class Room {
private String no;
private String type;//标准 双人 豪华
private boolean isUse;
public Room(String no, String type, boolean isUse) {
super();
this.no = no;
this.type = type;
this.isUse = isUse;
}
public String getNo() {
return no;
}
public void setNo(String no) {
this.no = no;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public boolean isUse() {
return isUse;
}
public void setUse(boolean isUse) {
this.isUse = isUse;
}
public String toString(){
return '['+no+']'+'['+type+']'+(isUse?"占用":"空闲")+" ";
}
}
-------------------------------------------
Hotel
public class Hotel {
Room [][]r;
Hotel(){
r=new Room[5][10];
for (int i = 0; i < r.length; i++) {
for (int j = 0; j < r[i].length; j++) {
if(0==i||1==i){
r[i][j]=new Room(((i+1)*100)+j+1+"","标准间",false);
}
if(2==i||3==i){
r[i][j]=new Room(((i+1)*100)+j+1+"","双人间",false);
}
if(4==i){
r[i][j]=new Room(((i+1)*100)+j+1+"","豪华间",false);
}
}}}
public void print(){
for (int i = 0; i < r.length; i++) {
for (int j = 0; j < r[i].length; j++) {
System.out.print(r[i][j]+" ");
}
System.out.println();
}
}
public void order(String no){
for (int i = 0; i < r.length; i++) {
for (int j = 0; j < r[i].length; j++) {
if(r[i][j].getNo().equals(no)){
r[i][j].setUse(true);
return;
}
}
}
}
}
-------------------------------------------------------------
main
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Hotel h = new Hotel();
h.print();
while(true){
System.out.println("請輸入預定房間");
Scanner s = new Scanner(System.in);
String no =s.next();
h.order(no);
h.print();
}
}
}
