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Java作为一种面向对象语言。支持以下基本概念：多态继承封装抽象类对象实例方法重载

对象：对象是类的一个实例（对象不是找个女朋友），有状态和行为。例如，一条狗是一个对象，它的状态有：颜色、名字、品种；行为有：摇尾巴、叫、吃等。
类：类是一个模板，它描述一类对象的行为和状态。
public class Dog { String breed; int size; String colour; int age; void eat() { } void run() { } void sleep(){ } void name(){ } }局部变量：在方法、构造方法或者语句块中定义的变量被称为局部变量。变量声明和初始化都是在方法中，方法结束后，变量就会自动销毁。成员变量：成员变量是定义在类中，方法体之外的变量。这种变量在创建对象的时候实例化。成员变量可以被类中方法、构造方法和特定类的语句块访问。类变量：类变量也声明在类中，方法体之外，但必须声明为 static 类型。
一个类可以拥有多个方法，在上面的例子中：eat()、run()、sleep() 和 name() 都是 Dog 类的方法。
- 一个源文件中只能有一个 public 类
- 一个源文件可以有多个非 public 类
- 源文件的名称应该和 public 类的类名保持一致。例如：源文件中 public 类的类名是 Employee，那么源文件应该命名为Employee.java。
- 如果一个类定义在某个包中，那么 package 语句应该在源文件的首行。
- 如果源文件包含 import 语句，那么应该放在 package 语句和类定义之间。如果没有 package 语句，那么 import 语句应该在源文件中最前面。
- import 语句和 package 语句对源文件中定义的所有类都有效。在同一源文件中，不能给不同的类不同的包声明。
类有若干种访问级别，并且类也分不同的类型：抽象类和 final 类等。这些将在访问控制章节介绍。

除了上面提到的几种类型，Java 还有一些特殊的类。

在 Java 中，如果给出一个完整的限定名，包括包名、类名，那么 Java 编译器就可以很容易地定位到源代码或者类。import 语句就是用来提供一个合理的路径，使得编译器可以找到某个类。
题量；正常难道；难。
pta4
import java.util.Scanner;

public class Main {

public static void main(String[] args) {

System.out.println("wrong format");
}
}
也是拿下15分好吧，终究是尽力了。
pta5
import java.util.Calendar;
import java.util.Objects;
import java.util.Scanner;

import static java.lang.System.exit;

//特色菜
class dish {
//特色菜的属性：菜名、口味、价格
String name;
String taste;
int price;

public dish(String name, String taste, int price) {
this.name = name;
this.taste = taste;
this.price = price;
}

public dish(String name, int price) {
this.name = name;
this.price = price;
}

public String getName() {
return name;
}

public String getTaste() {
return taste;
}

public int getPrice() {
return price;
}

public void setName(String name) {
this.name = name;
}

public void setTaste(String taste) {
this.taste = taste;
}

public void setPrice(int price) {
this.price = price;
}
}

//普通菜

//桌号
//table + 序号 +英文空格+ 日期（格式：YYYY/MM/DD）+英文空格+ 时间（24小时制格式： HH/MM/SS）
class Table {
int num;
String name;
String phone;
String date;
//时间
String time;

public Table(int num, String name, String phone, String date, String time) {
this.num = num;
this.name = name;
this.phone = phone;
this.date = date;
this.time = time;
}

public int getNum() {
return num;
}

public String getName() {
return name;
}

public String getPhone() {
return phone;
}

public String getDate() {
return date;
}

public String getTime() {
return time;
}

public void setNum(int num) {
this.num = num;
}

public void setName(String name) {
this.name = name;
}

public void setPhone(String phone) {
this.phone = phone;
}

public void setDate(String date) {
this.date = date;
}

public void setTime(String time) {
this.time = time;
}

}

class User {
int num;
String name;
String phone;
int price;

public User(int num, String name, String phone, int price) {
this.num = num;
this.name = name;
this.phone = phone;
this.price = price;
}

public String getName() {
return name;
}

public String getPhone() {
return phone;
}

public int getPrice() {
return price;
}

public int getNum() {
return num;
}

public void setName(String name) {
this.name = name;
}

public void setPhone(String phone) {
this.phone = phone;
}

public void setPrice(int price) {
this.price = price;
}

public void setNum(int num) {
this.num = num;
}

}

//点菜记录格式：序号+英文空格+菜名+英文空格+辣/酸/甜度值+英文空格+份额+英文空格+份数特色菜
class recorde {
int tableNum1;
int num;
String name;
String taste;
int portion;
int count;

public recorde(int num, String name, String taste, int portion, int count) {
this.num = num;
this.name = name;
this.taste = taste;
this.portion = portion;
this.count = count;
}

//普通点菜
//序号、菜名、份额、份数
public recorde(int num, String name, int portion, int count) {
this.num = num;
this.name = name;
this.portion = portion;
this.count = count;
}

public recorde(int tableNum1, int num, String name, String taste, int portion, int count) {
this.tableNum1 = tableNum1;
this.num = num;
this.name = name;
this.taste = taste;
this.portion = portion;
this.count = count;
}

public int getTableNum1() {
return tableNum1;
}

public int getNum() {
return num;
}

public String getName() {
return name;
}

public String getTaste() {
return taste;
}

public int getPortion() {
return portion;
}

public int getCount() {
return count;
}

public void setNum(int num) {
this.num = num;
}

public void setName(String name) {
this.name = name;
}

public void setTaste(String taste) {
this.taste = taste;
}

public void setPortion(int portion) {
this.portion = portion;
}

public void setCount(int count) {
this.count = count;
}

public void setTableNum1(int tableNum1) {
this.tableNum1 = tableNum1;
}

}

public class Main {
//特色菜记录数
public static int dishNum = 0;
public static dish dish[] = new dish[100];
//普通菜记录数
//桌号
public static int tableNum = 0;
public static Table table[] = new Table[100];
public static recorde recorde[][] = new recorde[100][100];
public static int Sum[] = new int[100];

public static int userNum = 0;
public static User user[] = new User[100];

public static boolean flag1=false;
public static boolean flag2=false;
public static boolean flag3=false;

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

while (true) {
String str = scanner.nextLine();
if (str.equals("end"))
break;
//菜单输入时增加特色菜，特色菜的输入格式：菜品名+英文空格+口味类型+英文空格+基础价格+"T"
//
//例如：麻婆豆腐川菜 9 T
//普通菜的输入格式：菜品名+英文空格+基础价格
//如果格式不对，直接输出wrong format

String[] str1 = str.split(" ");
//多条记录
//重复记录
if (str1.length == 4 && str1[3].equals("T")) {
dishNum++;
String name = str1[0];
String taste = str1[1];
int price = Integer.parseInt(str1[2]);
dish[dishNum] = new dish(name, taste, price);
int num=find4(name);
if(num!=-1) dish[num] = new dish(name, taste, price);
} else if (str1.length == 2) {
String name=str1[0];
int price=Integer.parseInt(str1[1]);
dish[++dishNum] = new dish(str1[0], Integer.parseInt(str1[1]));
int num=find4(name);
if(num!=-1) dish[num] = new dish(name, price);
}
else if(str1[2].equals("T")||str1[1].equals("T")||str1[0].equals("T"))
{
flag1=true;
}
//输入格式:
//table 1 : tom 13605054400 2023/5/1 20/30/00
else if (str1[0].equals("table"))//如果是table
{
tableNum++;
if(str1.length!=7)
{
flag2=true;
continue;
}
int num = Integer.parseInt(str1[1]);
String name = str1[3];
String phone = str1[4];
String date = str1[5];
String time = str1[6];
if(!check2(name,phone)) flag2=true;
table[tableNum] = new Table(num, name, phone, date, time);
}
//点菜
//点菜记录格式：序号+英文空格+菜名+英文空格+辣/酸/甜度值+英文空格+份额+英文空格+份数
else if (str1[0].length() == 1 && str1.length == 5) {
Sum[tableNum]++;
int num = Integer.parseInt(str1[0]);
String name = str1[1];
String taste = str1[2];
int portion = Integer.parseInt(str1[3]);
int count = Integer.parseInt(str1[4]);
recorde[tableNum][Sum[tableNum]] = new recorde(num, name, taste, portion, count);
//1 醋浇羊肉 30
}
//普通点菜
//序号、菜名、份额、份数
else if (str1[0].length() == 1 && str1.length == 4) {
Sum[tableNum]++;
int num = Integer.parseInt(str1[0]);
String name = str1[1];
int portion = Integer.parseInt(str1[2]);
int count = Integer.parseInt(str1[3]);
recorde[tableNum][Sum[tableNum]] = new recorde(num, name, portion, count);
}
//代点菜1 1 醋浇羊肉 0 1 2
else if (str1[0].length() == 1&& str1.length == 6) {
Sum[tableNum]++;
int tableNum1 = Integer.parseInt(str1[0]);
int num = Integer.parseInt(str1[1]);
String name = str1[2];
String taste = str1[3];
int portion = Integer.parseInt(str1[4]);
int count = Integer.parseInt(str1[5]);
recorde[tableNum][Sum[tableNum]] = new recorde(num, tableNum1, name, taste, portion, count);
}
//序号 delete
//删除记录格式：序号 delete
//
//标识删除对应序号的那条点菜记录。
//
//如果序号不对，输出"delete error"
else if (str1[1].equals("delete")) {
int num = Integer.parseInt(str1[0]);
if (num > Sum[tableNum] || num < 1) {
System.out.println("delete error");
exit(0);
continue;
}
for (int i = num; i < Sum[tableNum]; i++) {
recorde[tableNum][i] = recorde[tableNum][i + 1];
}
Sum[tableNum]--;
}
else if(tableNum>=1)
{
if(str1[0].length()!=1) flag3=true;

if(str1[1].length()<=2) flag3=true;

String name=str1[1];
name=check1(name);
if(name==null)
{
if(str1.length!=4) flag3=true;
}
else
{
if(str1.length!=5) flag3=true;
}
}
}

//计算总价

//输出
//table 1:
//1 麻婆豆腐 24
//2 油淋生菜 14
//3 麻婆豆腐 48
//table 1: 86 62 川菜 4 稍辣
//tom 13605054400 62
//2023/5/1 20/30/00
//首先输出桌号
//辣度

int spicy[] = new int[100];
/*
川菜增加辣度值：辣度0-5级；对应辣度水平为：不辣、微辣、稍辣、辣、很辣、爆辣；

晋菜增加酸度值，酸度0-4级；对应酸度水平为：不酸、微酸、稍酸、酸、很酸；

浙菜增加甜度值，甜度0-3级；对应酸度水平为：不甜、微甜、稍甜、甜；
*/
int[] acidity = new int[100];
int[] sweetness = new int[100];

String[] spicy1 = {"不辣", "微辣", "稍辣", "辣", "很辣", "爆辣"};
int[] spicyNum = new int[100];
int[] spicyNum1 = new int[100];

String[] acidity1 = {"不酸", "微酸", "稍酸", "酸", "很酸"};
int[] acidityNum = new int[100];
int[] acidityNum1 = new int[100];

String[] sweetness1 = {"不甜", "微甜", "稍甜", "甜"};
int[] sweetnessNum = new int[100];
int[] sweetnessNum1 = new int[100];

/* if (check(table[1])) {
System.out.println("table 1 out of opening hours");
exit(0);
}*/

//System.out.println("table 1:"+table[1].getDate()+" "+table[1].getTime());

boolean flag=false;

if(flag1)
{
flag=true;
System.out.print("wrong format");
}
if(flag2)
{
flag=true;
if(flag1) System.out.println();
System.out.print("wrong format");
}
if(flag3)
{
flag=true;
if(flag1||flag2) System.out.println();
System.out.print("wrong format");
}

if(flag) exit(0);

for(int i=1;i<=tableNum;i++)
{
if(!check(table[i]))
{
System.out.println("table "+i+" out of opening hours");
exit(0);
}
}

//输出点菜记录
int[] price = new int[100];
int[] price1 = new int[100];

for (int i = 1; i <= tableNum; i++) {
System.out.println("table " + i + ":"+" ");
for (int j = 1; j <= Sum[i]; j++) {
//每条点菜记录输出：序号+英文空格+菜名+英文空格+价格。其中的价格等于对应记录的菜品\*份数，序号是之前输入的订单记录的序号。如果订单中包含不能识别的菜名，则输出“\*\* does not exist”，\*\*是不能识别的菜名
if(recorde[i][j].getName()!=null &&!find3(recorde[i][j].getName())){
System.out.println(recorde[i][j].getName()+" does not exist");
continue;
}

if (recorde[i][j] == null)
continue;

if (recorde[i][j].getTableNum1() != 0) {
int k = recorde[i][j].getTableNum1();
System.out.println(recorde[i][j].getNum() + " table " + i + " pay for table " + recorde[i][j].getTableNum1() + " " + (int) (find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5));
if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "1")) {
spicyNum[k] += recorde[i][j].getCount();
spicyNum1[k] += recorde[i][j].getCount();
spicy[k] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
} else if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "2")) {
acidityNum[k] += recorde[i][j].getCount();
acidityNum1[k] += recorde[i][j].getCount();
acidity[k] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
} else if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "3")) {
sweetnessNum[k] += recorde[i][j].getCount();
sweetnessNum1[k] += recorde[i][j].getCount();
sweetness[k] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
}
int n = (int) (1.0*find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5);
int n1= (int) ((int)(1.0*find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5) * discount(table[i], recorde[i][j].getName()) + 0.5);;
price[i] += n;
price1[i] += n1;
continue;
}

//判断辣度是否超出范围
if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "1") && Integer.parseInt(recorde[i][j].getTaste()) > 5) {
System.out.println("spicy num out of range :" + recorde[i][j].getTaste());
continue;
}

//判断酸度是否超出范围
if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "2") && Integer.parseInt(recorde[i][j].getTaste()) > 4) {
System.out.println("acidity num out of range :" + recorde[i][j].getTaste());
continue;
}

//判断甜度是否超出范围
if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "3") && Integer.parseInt(recorde[i][j].getTaste()) > 3) {
System.out.println("sweetness num out of range :" + recorde[i][j].getTaste());
continue;
}

price[i] += (int) (1.0*find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5);
price1[i] += (int) ((int)(1.0*find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5) * discount(table[i],recorde[i][j].getName()) + 0.5);

System.out.println(recorde[i][j].getNum() + " " + recorde[i][j].getName() + " " + (int) (find(recorde[i][j].getName()) * recorde[i][j].getCount() * prices(recorde[i][j].getPortion()) + 0.5));

if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "1")) {
spicyNum[i] += recorde[i][j].getCount();
spicyNum1[i] += recorde[i][j].getCount();
spicy[i] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
} else if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "2")) {
acidityNum[i] += recorde[i][j].getCount();
acidityNum1[i] += recorde[i][j].getCount();
acidity[i] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
} else if (recorde[i][j].getTaste() != null && Objects.equals(check1(recorde[i][j].name), "3")) {
sweetnessNum[i] += recorde[i][j].getCount();
sweetnessNum1[i] += recorde[i][j].getCount();
sweetness[i] += (int) (Integer.parseInt(recorde[i][j].getTaste()) * recorde[i][j].getCount() + 0.5);
}
}

//判断是否有重复的用户
//如果没有重复的用户，就创建新的用户
if(!find2(table[i].name)){
user[userNum++] = new User(userNum, table[i].name, table[i].phone, price1[i]);
}else{
for(int k = 0; k < userNum; k++){
if(Objects.equals(user[k].name, table[i].name)){
user[k].price += price1[i];
break;
}
}
}
}
/*
table 1: 113 113 川菜 1 稍辣晋菜 6 微酸浙菜 1 甜
table 2: 168 118 川菜 4 稍辣
table 3: 103 73 川菜 1 爆辣晋菜 1 稍酸浙菜 3 微甜
* */

for (int i = 1; i <= tableNum; i++) {
if (spicyNum[i] != 0) spicy[i] = (int) (1.0*spicy[i] / spicyNum[i] + 0.5);
if (acidityNum[i] != 0) acidity[i] = (int) (1.0*acidity[i] / acidityNum[i] + 0.5);
if (sweetnessNum[i] != 0) sweetness[i] = (int) (1.0*sweetness[i] / sweetnessNum[i] + 0.5);
}
for (int i = 1; i <= tableNum; i++) {
System.out.print("table " + table[i].getNum() + ": ");
System.out.print(price[i] + " " + (price1[i]));
if (spicy[i] != 0) {
System.out.print(" " + "川菜" + " " + spicyNum1[i] + " " + spicy1[spicy[i]]);
}
if (acidity[i] != 0) {
System.out.print(" " + "晋菜" + " " + acidityNum1[i] + " " + acidity1[acidity[i]]);
}
if (sweetness[i] != 0) {
System.out.print(" " + "浙菜" + " " + sweetnessNum1[i] + " " + sweetness1[sweetness[i]]);
}
System.out.println();
}

//最后按name顺序输出每位客户(不考虑客户同名或拼音相同的情况)的支付金额，格式：用户姓名+英文空格+手机号+英文空格+支付总金额，按输入顺序排列。
//排序
for (int i = 0; i < userNum; i++) {
for (int j = i + 1; j < userNum; j++) {
if (user[i].getName().compareTo(user[j].getName()) > 0) {
User temp = user[i];
user[i] = user[j];
user[j] = temp;
}
}
}

//输出
for (int i = 0; i < userNum-1; i++) {
System.out.println(user[i].getName() + " " + user[i].getPhone() + " " + user[i].getPrice());
}
System.out.print(user[userNum-1].getName() + " " + user[userNum-1].getPhone() + " " + user[userNum-1].getPrice());

}

public static String check1(String name) {
name = find1(name);

if(name==null)
return null;

if (name.equals("川菜"))
return "1";
if (name.equals("晋菜"))
return "2";
if (name.equals("浙菜"))
return "3";
return null;
}

public static boolean find3(String name)
{
for(int i =1; i <= dishNum; i++)
{
if(Objects.equals(dish[i].getName(), name))
return true;
}
return false;
}

//约束条件：客户姓名不超过10个字符，手机号11位，前三位必须是180、181、189、133、135、136其中之一。
public static boolean check2(String name, String phone) {
if (name.length() > 10)
return false;
if (phone.length() != 11)
return false;
if (phone.charAt(0) != '1')
return false;
if (phone.charAt(1) != '8' && phone.charAt(1) != '3')
return false;
if (phone.charAt(1) == '8' && phone.charAt(2) != '0' && phone.charAt(2) != '1' && phone.charAt(2) != '9')
return false;
if (phone.charAt(1) == '3' && phone.charAt(2) != '3' && phone.charAt(2) != '5' && phone.charAt(2) != '6')
return false;
return true;
}

public static boolean find2(String name) {
for (int i = 0; i < userNum; i++) {
if (user[i].getName().equals(name))
return true;
}
return false;
}

public static String find1(String name) {
for (int i = 1; i <= dishNum; i++) {
if (dish[i].getName().equals(name))
return dish[i].getTaste();
}
return null;
}

public static int find4(String name)
{
for(int i=1;i<=dishNum;i++)
{
if(dish[i].getName()==null)
return -1;
if(Objects.equals(dish[i].getName(),name))
return i;
}
return -1;
}

//桌号时间超出营业范围。例如：
public static boolean check(Table table) {
int year = Integer.parseInt(table.date.split("/")[0]);
int month = Integer.parseInt(table.date.split("/")[1]);
int day = Integer.parseInt(table.date.split("/")[2]);
int hour = Integer.parseInt(table.time.split("/")[0]);
int minute = Integer.parseInt(table.time.split("/")[1]);
int second = Integer.parseInt(table.time.split("/")[2]);
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, day, hour, minute, second);
int week = calendar.get(Calendar.DAY_OF_WEEK);
if (week == 3 || week == 4) {
if(hour >=10 && hour <=20) return true;
if(hour==9&&minute>=30) return true;
return hour == 21 && minute <= 30;
} else {
if(hour >=10 && hour <=14) return true;
if(hour >=17 && hour <=19) return true;
if(hour==9&&minute>=30) return true;
return hour == 20 && minute <= 30;
}

}

//计算折扣
//折扣的计算方法（注：以下时间段均按闭区间计算）：
//周一至周五营业时间与折扣：晚上（17：00-20：30）8折，周一至周五中午（10:30--14:30）6折，其余时间不营业。

//周末全价，营业时间：9:30-21:30

//判断是周几，然后打几折
public static double discount(Table table,String name){

int year = Integer.parseInt(table.date.split("/")[0]);
int month = Integer.parseInt(table.date.split("/")[1]);
int day = Integer.parseInt(table.date.split("/")[2]);
int hour = Integer.parseInt(table.time.split("/")[0]);
int minute = Integer.parseInt(table.time.split("/")[1]);
int second = Integer.parseInt(table.time.split("/")[2]);

Calendar calendar = Calendar.getInstance();
calendar.set(year, month, day, hour, minute, second);
int week = calendar.get(Calendar.DAY_OF_WEEK);

name=check1(name);
if((name!=null)&&(name.equals("1")||name.equals("2")||name.equals("3")))
{
if(week==3||week==4) return 1.0;
else return 0.7;
}
else
{
if(week==3||week==4) return 1.0;
else
{
if(hour>=17&&hour<=19) return 0.8;
if(hour==20&&minute<=30) return 0.8;
if(hour>=11&&hour<=13) return 0.6;
if(hour==10&&minute>=30) return 0.6;
if(hour==14&&minute<=30) return 0.6;
}
}

return 1.0;

}

public static double prices(int num) {
if (num == 1) return 1.0;
if (num == 2) return 1.5;
if (num == 3) return 2.0;
return 0;
}

public static int find(String name) {
for (int i = 1; i <= dishNum; i++) {
if (dish[i].getName().equals(name))
return dish[i].getPrice();
}
也是拿下了62分，非常开心，加油。
期中考试也是拿下好吧
import java.util.Scanner;

class Circle {
     private double r;
    public Circle(){

    }
     public double getbanjing() {
        return r;
    }

    public void setbanjing(double r) {
        this.r = r;
    }
public double getmianji() {
        return 3.141592654*(r*r);
    }
}
public class Main{
public static void main(String[] args){
Scanner cao=new Scanner(System.in);
            double r = cao.nextDouble();
        Circle circle = new Circle();
    circle.setbanjing(r);
   // double rr=circle.getbanjing()*3.14159*circle.getbanjing();
    if(r>0)
    System.out.println(String.format("%.2f",circle.getmianji()));
    else
        System.out.println("Wrong Format");
}


}
import java.util.Scanner;

c

public class Main{
public static void main(String[] args){
Scanner cao=new Scanner(System.in);

    double x1=cao.nextDouble();
double y1=cao.nextDouble();
double x2=cao.nextDouble();
double y2=cao.nextDouble();

    Point b= new Point(x2,y2);
    Point a= new Point(x1,y1);
Rectangle juxing = new Rectangle(a,b);

double m;
    m=juxing.getmianji();
    if(m>=0)
        System.out.println(String.format("%.2f",juxing.getmianji()));
    if(m<0)
    System.out.println(String.format("%.2f",-1*juxing.getmianji()));
}
}
import java.util.Scanner;
import java.util.*;

class Shape implements Comparable{
double Area;
int i=1;
public Shape(){

    }
public double getArea(){
     return Area;
    }

}

class Circle extends Shape {
     private double r;
    public Circle(){

    }
       public Circle(double r){

        this.r = r;
    }
     public double getbanjing() {
        return r;
    }

    public void setbanjing(double r) {
        this.r = r;
    }

public double getArea() {
               if(r<=0)
               return -1;
        return 3.141592654*(r*r);
    }
}

class Rectangle extends Shape{
private Point b;
    private Point a;

    public Rectangle(Point a,Point b)
    {

        this.a=a;
        this.b=b;
    }
    public double getArea() {
        return (b.getx()-a.getx())*(b.gety()-a.gety());
    }

}
class Point{
private double x;
private double y;
         public Point(double x,double y){
        this.x=x;
             this.y=y;
    }
public double getx(){
    return x;
}
    public double gety(){
    return y;
}


     }

    public class Main {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        ArrayList<Shape> list = new ArrayList<>();

        int choice = input.nextInt();

        while(choice != 0) {
            switch(choice) {
            case 1://Circle
                double radiums = input.nextDouble();
                Shape circle = new Circle(radiums);
                list.add(circle);
                break;
            case 2://Rectangle
                double x1 = input.nextDouble();
                double y1 = input.nextDouble();
                double x2 = input.nextDouble();
                double y2 = input.nextDouble();
                Point leftTopPoint = new Point(x1,y1);
                Point lowerRightPoint = new Point(x2,y2);
                Rectangle rectangle = new Rectangle(leftTopPoint,lowerRightPoint);
                list.add(rectangle);
                break;
            }
            choice = input.nextInt();
        }

        list.sort(Comparator.naturalOrder());//正向排序

        for(int i = 0; i < list.size(); i++) {
            System.out.print(String.format("%.2f", list.get(i).getArea()) + " ");
        }
    }
}
import java.util.Scanner;

class Shape{
double Area;
int i=1;
public Shape(){

    }
public double getArea(){
     return Area;
    }

}

class Circle extends Shape {
     private double r;
    public Circle(){

    }
       public Circle(double r){

        this.r = r;
    }
     public double getbanjing() {
        return r;
    }

    public void setbanjing(double r) {
        this.r = r;
    }

public double getArea() {
               if(r<=0)
               return -1;
        return 3.141592654*(r*r);
    }
}

class Rectangle extends Shape{
private Point b;
    private Point a;

    public Rectangle(Point a,Point b)
    {

        this.a=a;
        this.b=b;
    }
    public double getArea() {
        return (b.getx()-a.getx())*(b.gety()-a.gety());
    }

}
class Point{
private double x;
private double y;
         public Point(double x,double y){
        this.x=x;
             this.y=y;
    }
public double getx(){
    return x;
}
    public double gety(){
    return y;
}


     }

class Main{
public static void printArea(Shape a){

    if(a.getArea()==-1)
    System.out.println("Wrong Format");
    else
        System.out.println(String.format("%.2f",a.getArea()));

}


    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);

        int choice = input.nextInt();

        switch(choice) {
        case 1://Circle
            double radiums = input.nextDouble();
            Shape circle = new Circle(radiums);
            printArea(circle);
            break;
       case 2://Rectangle
            double x1 = input.nextDouble();
            double y1 = input.nextDouble();
            double x2 = input.nextDouble();
            double y2 = input.nextDouble();

            Point leftTopPoint = new Point(x1,y1);
            Point lowerRightPoint = new Point(x2,y2);

            Rectangle rectangle = new Rectangle(leftTopPoint,lowerRightPoint);

            printArea(rectangle);
            break;
        }

    }
}
ok期中考试也是拿下，拜拜。

posted @ 2023-05-17 20:40 孙恒博阅读(78) 评论(0) 收藏举报

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