借書卡

class BookCard {
String Cardnum,name,Idname;//包含賬号,持卡人姓名
int borrowsnum,Returnnum,Remain;//已借書數,已還書數,可借書數
//本次借書數//本次還書數。
//方法有借書、還書和查詢。
public void borrow(int cash){
if(Remain>=cash){
Remain=Remain-cash;
System.out.println("本次借閱書數"+cash);
System.out.println("可借書數"+Remain);
}
}
public BookCard(String cardnum, String name, String idname, int borrowsnum,int returnnum, int remain) {
Cardnum = cardnum;
this.name = name;
Idname = idname;
this.borrowsnum = borrowsnum;
Returnnum = returnnum;
Remain = remain;
}
public BookCard() {
// TODO Auto-generated constructor stub
}
public void TheReturn(int cash){
Remain=Remain+cash;
System.out.println("本次還書數"+cash);
System.out.println("可借書數"+Remain);
}
public void query(){
System.out.println("可借書數"+Remain);
}
}


public class Task02 {
public static void main(String[] args) {//程式的入口
BookCard wang=new BookCard();//建立類的對象
wang.borrowsnum=10;
wang.Cardnum="111";
wang.Idname="12345";
wang.name="wangwu";
wang.Remain=5;
wang.Returnnum=2;
wang.borrow(2);
wang.TheReturn(1);
wang.query();
}
}