- 1. 前言
这三次的主要知识点涉及到了题目集7的类的继承与多态、接口的应用、ArrayList链表排序、题目集8的类的设计、字符串的处理以及题目集9在题目集8上面的叠加。
题目集7有两道题7-1 图形卡片排序游戏、7-2 图形卡片分组游戏，7-1主要考察了继承、多态的应用；ArrayList泛型的应用方法、Comparable接口及泛型的应用、单一职责原则的应用、开-闭”原则的应用；7-2主要考察了类的继承、多态性使用方法以及接口的应用。难度适中，花费时间为1：2。
题目集8有一道题为ATM机类结构设计（一）主要考察了类的设计、字符串的处理，这道题完成功能并不难，但是要合理且依照类与类之间的关系来完成类的设计。
题目集9在题目集8的基础上增加了功能但类的设计和题目集8相差不大，与题目集8相比花的时间较少。
- 2. 设计与分析
题目集7 7-1
问题在于如何对所有图形进行统一处理，定义统一接口或父类后，使用父类对象作为参数，在实际操作时会自动调用子类重写的方法，在创建对象的时候将子类对象的引用赋值给父类对象，就可以对所有的图形进行统一操作。
class DealCardList{
protected ArrayList<Card> cardList = new ArrayList<Card>();
DealCardList(){
}
DealCardList(ArrayList<Integer> list){
for(int i=0;i<list.size();i++){
if(list.get(i)==1){
double radius = Main.input.nextDouble();
cardList.add(new Card(new Circle(radius)));
}
if(list.get(i)==2){
double width = Main.input.nextDouble();
double length = Main.input.nextDouble();
cardList.add(new Card(new Rectangle(width,length)));
}
if(list.get(i)==3){
double side1 = Main.input.nextDouble();
double side2 = Main.input.nextDouble();
double side3 = Main.input.nextDouble();
cardList.add( new Card(new Triangle(side1,side2,side3)));
}
if(list.get(i)==4){
double topSide = Main.input.nextDouble();
double bottomSide = Main.input.nextDouble();
double height = Main.input.nextDouble();
cardList.add(new Card(new Trapezoid(topSide,bottomSide,height)));
}
}
}
public void cardSort(){
Collections.sort(cardList);
}
public boolean validate(){
for(int i=0;i<this.cardList.size();i++){
if(!this.cardList.get(i).getShape().validate()){
return false;
}
}
return true;
}
public double getAllArea(){
double sum=0;
for(int i=0;i<cardList.size();i++){
sum = sum + cardList.get(i).getShape().getArea();
}
return sum;
}
public void showResult(){
System.out.println("The original list:");
for(int i=0;i<cardList.size();i++){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
System.out.println();
System.out.println("The sorted list:");
for(int i=0;i<cardList.size();i++){
cardSort();
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
System.out.println();
System.out.println("Sum of area:"+String.format("%.2f", getAllArea()));
}
}
题目集7 7-2
基本和7-1相同，增加了对总面积最大值的统计，只需要在流操作的时候，用提前的定义的最大值变量与计算出的面积进行比较，更新最大值即可。
class DealCardList{
protected ArrayList<Card> cardList = new ArrayList<Card>();
DealCardList(){
}
DealCardList(ArrayList<Integer> list){
for(int i=0;i<list.size();i++){
if(list.get(i)==1){
double radius = Main.input.nextDouble();
cardList.add(new Card(new Circle(radius)));
}
if(list.get(i)==2){
double width = Main.input.nextDouble();
double length = Main.input.nextDouble();
cardList.add(new Card(new Rectangle(width,length)));
}
if(list.get(i)==3){
double side1 = Main.input.nextDouble();
double side2 = Main.input.nextDouble();
double side3 = Main.input.nextDouble();
cardList.add( new Card(new Triangle(side1,side2,side3)));
}
if(list.get(i)==4){
double topSide = Main.input.nextDouble();
double bottomSide = Main.input.nextDouble();
double height = Main.input.nextDouble();
cardList.add(new Card(new Trapezoid(topSide,bottomSide,height)));
}
}
}
public void cardSort(){
Collections.sort(cardList);
}
public boolean validate(){
for(int i=0;i<this.cardList.size();i++){
if(!this.cardList.get(i).getShape().validate()){
return false;
}
}
return true;
}
public double getAllArea(){
double sum1=0;
double sum2=0;
double sum3=0;
double sum4=0;
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Circle"){
sum1 = sum1 + cardList.get(i).getShape().getArea();
}
if(cardList.get(i).getShape().shapeName=="Rectangle"){
sum2= sum2 + cardList.get(i).getShape().getArea();
}
if(cardList.get(i).getShape().shapeName=="Triangle"){
sum4= sum4 + cardList.get(i).getShape().getArea();
}
if(cardList.get(i).getShape().shapeName=="Trapezoid"){
sum4= sum4 + cardList.get(i).getShape().getArea();
}
}
Double sum5 = Math.max(sum1,Math.max(sum2, Math.max(sum3, sum4)));
return sum5;
}
public void showResult(){
System.out.println("The original list:");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
System.out.print("]");
System.out.println();
System.out.println("The Separated List:");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Circle"){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Rectangle"){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Triangle"){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Trapezoid"){
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.println("]");
System.out.println("The Separated sorted List:");
cardSort();
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Circle"){
cardSort();
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Rectangle"){
cardSort();
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Triangle"){
cardSort();
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.print("[");
for(int i=0;i<cardList.size();i++){
if(cardList.get(i).getShape().shapeName=="Trapezoid"){
cardSort();
System.out.print(cardList.get(i).getShape().shapeName+":"+String.format("%.2f",cardList.get(i).getShape().getArea())+" ");
}
}
System.out.print("]");
System.out.println();
System.out.println("The max area:"+String.format("%.2f", getAllArea()));
}
}
题目集8
本题主要考查了类的设计
import java.util.ArrayList;
import java.util.Scanner;
public class Main {
private static String [][]Bankinf = new String[][] {
{"中国建设银行","01"},
{"中国建设银行","02"},
{"中国建设银行","03"},
{"中国建设银行","04"},
{"中国工商银行","05"},
{"中国工商银行","06"},
{"中国农业银行","07"},
{"中国农业银行","08"},
{"中国农业银行","09"},
{"中国农业银行","10"},
{"中国农业银行","11"},
};
private static String [][]Cardinf = new String[][] {
{"杨过","中国建设银行","3217000010041315709","10000.00","6217000010041315709","借"},
{"杨过","中国建设银行","3217000010041315709","10000.00","6217000010041315715","借"},
{"杨过","中国建设银行","3217000010041315715","10000.00","6217000010041315718","借"},
{"郭靖","中国建设银行","3217000010051320007","10000.00","6217000010051320007","借"},
{"张无忌","中国工商银行","3222081502001312389","10000.00","6222081502001312389","借"},
{"张无忌","中国工商银行","3222081502001312390","10000.00","6222081502001312390","借"},
{"张无忌","中国工商银行","3222081502001312399","10000.00","6222081502001312399","借"},
{"张无忌","中国工商银行","3222081502001312399","10000.00","6222081502001312400","借"},
{"韦小宝","中国工商银行","3222081502051320785","10000.00","6222081502051320785","借"},
{"韦小宝","中国工商银行","3222081502051320786","10000.00","6222081502051320786","借"},
{"张三丰","中国建设银行","3640000010045442002","10000.00","6640000010045442002","贷"},
{"张三丰","中国建设银行","3640000010045442002","10000.00","6640000010045442003","贷"},
{"令狐冲","中国工商银行","3640000010045441009","10000.00","6640000010045441009","贷"},
{"乔峰","中国农业银行","3630000010033431001","10000.00","6630000010033431001","贷"},
{"洪七公","中国农业银行","3630000010033431008","10000.00","6630000010033431008","贷"},
};
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String a = sc.nextLine();
String []strxx = new String[10];
String []print = new String[10];
int n=0;
while(!a.equals("#")) {
strxx[n] = a;n++;
a = sc.nextLine();
}
for(int i=0;i<n;i++) {
String strxx1=strxx[i];
String print1="";
String[] y = strxx1.split("\\s+");
int flag=0;
for(int j=0;j<15;j++) {
if(y[0].equals(Cardinf[j][4])) {
flag=1;
}
}
if(flag==0) {
print1="Sorry,this card does not exist.\n";
}
else {
if(y.length==1) {
for(int j=0;j<15;j++) {
if(y[0].equals(Cardinf[j][4])) {
float balance =Float.parseFloat(Cardinf[j][3]);
print1="业务：查询余额 ¥"+String.format("%.2f", balance)+"\n";
}
}
}
else {
if(y[1].equals("88888888")) {
if(y[2].equals("01")||y[2].equals("02")||y[2].equals("03")||y[2].equals("04")||y[2].equals("05")||y[2].equals("06")||y[2].equals("07")||y[2].equals("08")||y[2].equals("09")||y[2].equals("10")||y[2].equals("11")) {
String bankname ="";
for(int m=0;m<11;m++) {
if(y[2].equals(Bankinf[m][1])) {
bankname = Bankinf[m][0];
}
}
float sum = 0;
for(int s=0;s<15;s++) {
if(y[0].equals(Cardinf[s][4])) {
if(Cardinf[s][1].equals(bankname)) {//同行
if(Cardinf[s][5].equals("借")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])) {
sum=Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3]);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+Cardinf[s][1]+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
else if(Cardinf[s][5].equals("贷")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])) {
sum=Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3]);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+Cardinf[s][1]+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if(Float.parseFloat(Cardinf[s][3])+50000/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])>0){
sum=(float) ((Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+Cardinf[s][1]+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if(Float.parseFloat(Cardinf[s][3])+50000/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])<=0) {
sum=Float.parseFloat(Cardinf[s][3])-(float) ((Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+Cardinf[s][1]+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
}//同行结束
else {//跨行
if(bankname.equals("中国建设银行")) {//跨到建行
if(Cardinf[s][5].equals("借")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])*1.02) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.02);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
else if(Cardinf[s][5].equals("贷")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])*1.02) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.02);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if(Float.parseFloat(Cardinf[s][3])/1.02+50000/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])>0){
sum=(float) ((Float.parseFloat(Cardinf[s][3])/1.02-Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if((Float.parseFloat(Cardinf[s][3])+50000)/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])<=0) {
sum=Float.parseFloat(Cardinf[s][3])-(float) ((Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
}//跨到建行结束
if(bankname.equals("中国工商银行")) {//跨到工行
if(Cardinf[s][5].equals("借")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])*1.03) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.03);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
else if(Cardinf[s][5].equals("贷")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])*1.03) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.03);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if(Float.parseFloat(Cardinf[s][3])/1.03+50000/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])>0){
sum=(float) ((Float.parseFloat(Cardinf[s][3])/1.03-Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if((Float.parseFloat(Cardinf[s][3])+50000)/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])<=0) {
sum=Float.parseFloat(Cardinf[s][3])-(float) ((Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
}//跨到工行结束
if(bankname.equals("中国农业银行")) {//跨到农行
if(Cardinf[s][5].equals("借")) {
if(Float.parseFloat(Cardinf[s][3])>=Float.parseFloat(y[3])*1.04) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.04);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
else if(Cardinf[s][5].equals("贷")) {
if(Float.parseFloat(Cardinf[s][3])/1.04>=Float.parseFloat(y[3])) {
sum=(float) (Float.parseFloat(Cardinf[s][3])-Float.parseFloat(y[3])*1.04);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if(Float.parseFloat(Cardinf[s][3])/1.04+50000/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])>0){
sum=(float) ((Float.parseFloat(Cardinf[s][3])/1.04-Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else if((Float.parseFloat(Cardinf[s][3])+50000)/1.05>=Float.parseFloat(y[3])&&Float.parseFloat(Cardinf[s][3])<=0) {
sum=Float.parseFloat(Cardinf[s][3])-(float) ((Float.parseFloat(y[3]))*1.05);
Cardinf[s][3]=sum+"";
if(s==0) {
Cardinf[1][3]=sum+"";
}
if(s==1) {
Cardinf[0][3]=sum+"";
}
if(s==6) {
Cardinf[7][3]=sum+"";
}
if(s==7) {
Cardinf[6][3]=sum+"";
}
if(s==10) {
Cardinf[11][3]=sum+"";
}
if(s==11) {
Cardinf[10][3]=sum+"";
}
float money1 = Float.parseFloat(y[3]);
print1="业务：取款 "+Cardinf[s][0]+"在"+bankname+"的"+y[2]+"号ATM机上取款¥"+String.format("%.2f", money1)+"\n当前余额为¥"+String.format("%.2f", sum)+"\n";
}
else {
Cardinf[s][3]="-50000";
print1="Sorry,your account balance is insufficient.\n";
}
}
}//跨到农行结束
}//跨行结束
}
}
}
else {
print1="Sorry,the ATM's id is wrong.\n";
}
}
else {
print1="Sorry,your password is wrong.\n";
}
}
}
print[i]=print1;
}
for(int i=0;i<n;i++) {
System.out.print(print[i]);
}
}
}
题目集9
从老师的代码中可以看到很明显的对应关系，利用老师的代码在上一题的基础上，多了一个贷款账户，只需要在操作类中新增两个方法。
/**
* 校验取款金额是否大于余额
*/
if (amount > balance-amount*aTM.getBank().getRate()&&account.getBankKind().equals("借记账号")) {
System.out.println("Sorry,your account balance is insufficient.");
System.exit(0);
}
if (amount+amount*aTM.getBank().getRate()-balance*0.05 > balance+50000&&account.getBankKind().equals("贷记账号")&&balance<=0) {
System.out.println("Sorry,your account balance is insufficient.");
System.exit(0);
}
if (amount+amount*aTM.getBank().getRate()-(amount - balance)*0.05 > balance+50000&&account.getBankKind().equals("贷记账号")&&balance>0) {
System.out.println("Sorry,your account balance is insufficient.");
System.exit(0);
}
/**
* 跨行以及借记
*/
if (account.getBank().getBankNO() != aTM.getBank().getBankNO()&&account.getBankKind().equals("借记账号")) {
account.setBalance(balance - amount-amount*aTM.getBank().getRate());
}
/**
* 不跨行以及借记
*/
if (account.getBank().getBankNO() == aTM.getBank().getBankNO()&&account.getBankKind().equals("借记账号")) {
account.setBalance(balance - amount);
}
/**
* 不跨行以及贷记
*/
if (account.getBank().getBankNO() == aTM.getBank().getBankNO()&&account.getBankKind().equals("贷记账号")) {
if(balance>=amount) {
account.setBalance(balance - amount);
}else if(amount>balance&&balance>0) {
account.setBalance(balance - amount - (amount - balance)*0.05);
}else if(amount>balance&&balance<=0) {
account.setBalance(balance - amount - amount *0.05);
}
}
/**
* 跨行以及贷记
*/
if (account.getBank().getBankNO() != aTM.getBank().getBankNO()&&account.getBankKind().equals("贷记账号")) {
if(balance>=amount) {
account.setBalance(balance - amount - amount*aTM.getBank().getRate());
}else if(amount>balance&&balance>0) {
account.setBalance(balance - amount - (amount - balance)*0.05-amount*aTM.getBank().getRate());
}else if(amount>balance&&balance<=0) {
account.setBalance(balance - amount - amount *0.05-amount*aTM.getBank().getRate());
}
}
- 3. 踩坑心得
提交的public class类名不为Main，比如，提交的类名如果是public class Main1就会出错。
提交的代码中有多个public class。注意：提交的代码中只能有一个public class。
复制的时候将程序第一行package也复制进来。
最新版的PTA使用Open JDK 8，已经支持Java 8。估计还不支持Java 9请不要用Java 9中的新语法。
显示格式错误，一般是因为你的输出最后一行少了回车换行，或者每行的行尾多了空格之类的错误.
- 4. 改进建议
作业难度的话建议还是可以呈现梯形，这样做起来不会觉得那么困难。题量3~5题比较合理。
- 5. 总结
这几次OO编程训练以来，逐渐养成面向对象的编程思维，一次次的加深我对其思想和设计的理解和体会。解决一个个问题实现一个个功能时，会想到一个个模块地去解决，同时也会遇到一点困难，逐步认识自己的不足，但解决之后就会有收获的，所谓”需求推动进步“。通过本阶段的作业，抛开基本的继承、多态，还学习到单一职责原则和“开-闭”原则，这样大大提高代码的质量，收获很大。
