一、实验目的
1.掌握软件开发的流程
2.熟练应用开发软件
二、实验内容
设计一个包含登录界面的计算机软件，该软件可以实现第一次作业中的全部功能，也可以保存用户的历史计算记录
三、流程图
四、登录界面
五、代码部分
（一）实现流程图代码
import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;
public class Software {
private static List<String> calculationHistory = new ArrayList<>();
public static void main(String[] args) {
openSoftware();
}
public static void openSoftware() {
// 软件显示登录界面
showLoginScreen();
// 用户输入用户名和密码
String username = getUserInput("Enter username: ");
String password = getUserInput("Enter password: ");
// 软件验证用户名和密码
if (validateCredentials(username, password)) {
// 如果验证成功，则进入软件主界面
showMainScreen(username);
} else {
// 如果验证失败，则显示错误信息并返回步骤3
System.out.println("Invalid username or password. Please try again.");
openSoftware();
}
}
public static void showLoginScreen() {
System.out.println("Displaying login screen...");
}
public static String getUserInput(String prompt) {
Scanner scanner = new Scanner(System.in);
System.out.print(prompt);
return scanner.nextLine();
}
public static boolean validateCredentials(String username, String password) {
// 在这里进行验证用户名和密码的逻辑
// 这里简单地返回一个固定的用户名和密码进行模拟
return username.equals("user") && password.equals("password");
}
public static void showMainScreen(String username) {
System.out.println("Welcome, " + username + "!");
String userAction;
do {
// 用户在主界面进行操作
userAction = getUserInput("Enter your action (or 'exit' to end): ");
if (!userAction.equalsIgnoreCase("exit")) {
// 软件执行相应操作
executeAction(userAction);
}
} while (!userAction.equalsIgnoreCase("exit"));
// 结束
endProgram();
}
public static void executeAction(String action) {
System.out.println("Executing action: " + action);
// 在这里执行相应的操作，这里简单地将操作记录添加到历史记录中
calculationHistory.add(action);
}
public static void endProgram() {
System.out.println("Ending the program...");
// 打印历史记录
System.out.println("Calculation history:");
for (String calculation : calculationHistory) {
System.out.println(calculation);
}
}
}
（二）实现登录界面代码部分
import java.util.Scanner;
import java.util.ArrayList;
public class CalculatorWithLoginAndHistory {
private static ArrayList<String> history = new ArrayList<>();
public static void main(String[] args) {
openSoftware();
}
public static void openSoftware() {
showLoginScreen();
String username = getUserInput("Enter username: ");
String password = getUserInput("Enter password: ");
if (validateCredentials(username, password)) {
showMainScreen(username);
} else {
System.out.println("Invalid username or password. Please try again.");
openSoftware();
}
}
public static void showLoginScreen() {
System.out.println("=====================================");
System.out.println("| CALCULATOR |");
System.out.println("| LOGIN PAGE |");
System.out.println("=====================================");
}
public static String getUserInput(String prompt) {
Scanner scanner = new Scanner(System.in);
System.out.print(prompt);
return scanner.nextLine();
}
public static boolean validateCredentials(String username, String password) {
// 在这里进行验证用户名和密码的逻辑
// 这里简单地返回一个固定的用户名和密码进行模拟
return username.equals("user") && password.equals("password");
}
public static void showMainScreen(String username) {
System.out.println("=====================================");
System.out.println("| CALCULATOR |");
System.out.println("| MAIN SCREEN |");
System.out.println("=====================================");
System.out.println("| 1. Perform Calculation |");
System.out.println("| 2. View History |");
System.out.println("| 3. Exit |");
System.out.println("=====================================");
String userAction;
do {
userAction = getUserInput("Enter your choice: ");
switch (userAction) {
case "1":
performCalculation(username);
break;
case "2":
viewHistory(username);
break;
case "3":
System.out.println("Exiting the program...");
break;
default:
System.out.println("Invalid choice. Please try again.");
break;
}
} while (!userAction.equals("3"));
}
public static void performCalculation(String username) {
System.out.println("Enter the expression to calculate (e.g. 5 + 3): ");
String expression = getUserInput("");
try {
String[] parts = expression.split(" ");
double num1 = Double.parseDouble(parts[0]);
String operator = parts[1];
double num2 = Double.parseDouble(parts[2]);
double result = 0;
switch (operator) {
case "+":
result = num1 + num2;
break;
case "-":
result = num1 - num2;
break;
case "*":
result = num1 * num2;
break;
case "/":
result = num1 / num2;
break;
default:
System.out.println("Invalid operator");
return;
}
history.add(username + " calculated: " + expression + " = " + result);
System.out.println("Result: " + result);
} catch (Exception e) {
System.out.println("Invalid expression");
}
}
public static void viewHistory(String username) {
System.out.println("=====================================");
System.out.println("| CALCULATOR |");
System.out.println("| HISTORY |");
System.out.println("=====================================");
for (String entry : history) {
if (entry.startsWith(username)) {
System.out.println(entry);
}
}
System.out.println("=====================================");
}
}
import java.util.ArrayList;
import java.util.Scanner;
public class Calculator {
private static ArrayList<String> history = new ArrayList<>();
public static void main(String[] args) {
System.out.println("Welcome to the calculator!");
Scanner scanner = new Scanner(System.in);
String userAction;
do {
System.out.println("Choose an action:");
System.out.println("1. Perform calculation");
System.out.println("2. View history");
System.out.println("3. Exit");
userAction = scanner.nextLine();
switch (userAction) {
case "1":
performCalculation();
break;
case "2":
viewHistory();
break;
case "3":
System.out.println("Exiting the program...");
break;
default:
System.out.println("Invalid choice. Please try again.");
break;
}
} while (!userAction.equals("3"));
}
public static void performCalculation() {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the expression to calculate (e.g. 5 + 3): ");
String expression = scanner.nextLine();
try {
String[] parts = expression.split(" ");
double num1 = Double.parseDouble(parts[0]);
String operator = parts[1];
double num2 = Double.parseDouble(parts[2]);
double result = 0;
switch (operator) {
case "+":
result = num1 + num2;
break;
case "-":
result = num1 - num2;
break;
case "*":
result = num1 * num2;
break;
case "/":
result = num1 / num2;
break;
default:
System.out.println("Invalid operator");
return;
}
history.add(expression + " = " + result);
System.out.println("Result: " + result);
} catch (Exception e) {
System.out.println("Invalid expression");
}
}
public static void viewHistory() {
System.out.println("=====================================");
System.out.println("| CALCULATOR |");
System.out.println("| HISTORY |");
System.out.println("=====================================");
for (String entry : history) {
System.out.println(entry);
}
System.out.println("=====================================");
}
}
（六）、计算机界面
