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# 温度转换器 (Temperature Converter) |
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这是一个简单的Java命令行程序,用于摄氏度(°C)与华氏度(°F)之间的相互转换。用户输入一个温度值和单位,程序自动进行转换并输出结果。 |
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## 功能特点 |
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- 支持摄氏度转华氏度 |
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- 支持华氏度转摄氏度 |
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- 友好的用户输入提示 |
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- 默认单位为摄氏度(当只输入数字时) |
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- 精确到小数点后两位的输出 |
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## 环境要求 |
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- **JDK版本**: 25.0.2 或更高版本(代码兼容Java 8+,但已在JDK 25.0.2下测试) |
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- **操作系统**: 任何支持Java的平台(Windows/Linux/macOS) |
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## 如何运行 |
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1. **编译代码** |
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打开终端(命令提示符),进入代码所在目录,执行: |
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```bash |
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javac TemperatureConverter.java |
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``` |
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1. 运行程序 |
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编译成功后,执行: |
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```bash |
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java TemperatureConverter |
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``` |
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2. 按照提示输入 |
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例如: |
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``` |
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请输入要转换的温度与单位(例如 36.6 C 或 97 F):36.6 C |
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``` |
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输出: |
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``` |
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36.60 °C = 97.88 °F |
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``` |
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import java.util.Scanner; |
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/** |
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* 温度转换器示例程序(Java版) |
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* 支持摄氏度(C)与华氏度(F)之间互转 |
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*/ |
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public class TemperatureConverter { |
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/** |
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* 将摄氏度转换为华氏度。 |
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* |
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* @param c 摄氏温度 |
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* @return 对应的华氏温度 |
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*/ |
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public static double celsiusToFahrenheit(double c) { |
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return c * 9.0 / 5.0 + 32.0; |
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} |
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/** |
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* 将华氏度转换为摄氏度。 |
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* |
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* @param f 华氏温度 |
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* @return 对应的摄氏温度 |
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*/ |
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public static double fahrenheitToCelsius(double f) { |
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return (f - 32.0) * 5.0 / 9.0; |
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} |
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public static void main(String[] args) { |
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Scanner scanner = new Scanner(System.in); |
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// 提示用户输入,格式示例:"36.6 C" 或 "97 F"
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System.out.print("请输入要转换的温度与单位(例如 36.6 C 或 97 F):"); |
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String s = scanner.nextLine().trim(); |
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if (s.isEmpty()) { |
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System.out.println("输入为空,程序退出。"); |
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return; |
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} |
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String[] parts = s.split("\\s+"); |
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double value; |
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String unit; |
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try { |
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value = Double.parseDouble(parts[0]); |
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// 允许用户输入两个部分:数值与单位,若单位缺失则默认为 'C'
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unit = (parts.length > 1) ? parts[1].toUpperCase() : "C"; |
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} catch (NumberFormatException e) { |
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System.out.println("输入解析失败,请按示例输入数值与单位,例如:36.6 C"); |
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return; |
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} |
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if (unit.startsWith("C")) { |
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// 从摄氏度转换为华氏度
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double f = celsiusToFahrenheit(value); |
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System.out.printf("%.2f °C = %.2f °F%n", value, f); |
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} else if (unit.startsWith("F")) { |
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// 从华氏度转换为摄氏度
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double c = fahrenheitToCelsius(value); |
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System.out.printf("%.2f °F = %.2f °C%n", value, c); |
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} else { |
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System.out.println("未知单位,请使用 C 或 F。"); |
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} |
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scanner.close(); |
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} |
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} |
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After Width: | Height: | Size: 324 KiB |
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public class w2{ |
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public static void main(String[] args) { |
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int[] sensorData = {85, -5, 92, 0, 105, 999, 88, 76}; |
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int validSum = 0; // 有效数据总和
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int validCount = 0; // 有效数据个数
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// 遍历传感器数据数组
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for (int data : sensorData) { |
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// 规则3:致命错误(999),终止处理
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if (data == 999) { |
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System.out.println("致命错误:传感器掉线,终止处理。"); |
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break; |
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} |
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// 规则2:无效数据(0/负数/大于100且非999),跳过并告警
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if (data <= 0 || data > 100) { |
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System.out.println("警告:发现越界数据[" + data + "],已跳过。"); |
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continue; |
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} |
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// 规则1:正常数据(1-100),累加求和并计数
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validSum += data; |
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validCount++; |
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} |
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// 最终输出逻辑
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if (validCount > 0) { |
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// 强制浮点除法,保留小数部分
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double average = (double) validSum / validCount; |
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System.out.println("有效数据平均值为:" + average); |
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} else { |
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System.out.println("无有效数据。"); |
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} |
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} |
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} |
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public class BankAccount { |
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private final String accountNumber; |
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private String ownerName; |
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private double balance; |
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public BankAccount(String accountNumber, String ownerName) { |
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this.accountNumber = accountNumber; |
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this.ownerName = ownerName; |
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this.balance = 0.0; |
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} |
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public String getAccountNumber() { |
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return accountNumber; |
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} |
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public String getOwnerName() { |
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return ownerName; |
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} |
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public void setOwnerName(String ownerName) { |
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this.ownerName = ownerName; |
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} |
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public double getBalance() { |
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return balance; |
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} |
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public void deposit(double amount) { |
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if (amount > 0) { |
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balance += amount; |
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System.out.println("存款成功!当前余额:" + balance); |
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} else { |
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System.out.println("存款失败:存款金额必须大于0!"); |
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} |
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} |
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public void withdraw(double amount) { |
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if (amount <= 0) { |
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System.out.println("取款失败:取款金额必须大于0!"); |
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} else if (amount > balance) { |
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System.out.println("取款失败:余额不足!"); |
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} else { |
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balance -= amount; |
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System.out.println("取款成功!当前余额:" + balance); |
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} |
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} |
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public static void main(String[] args) { |
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BankAccount account = new BankAccount("622202123456789", "张三"); |
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System.out.println("账号:" + account.getAccountNumber()); |
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System.out.println("户主:" + account.getOwnerName()); |
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System.out.println("初始余额:" + account.getBalance()); |
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account.deposit(500); |
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account.withdraw(200); |
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account.withdraw(400); |
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} |
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} |
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package src.main.w5; |
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// 抽象图形类
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abstract class Shape { |
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public abstract double getArea(); |
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} |
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// 圆形类
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class Circle extends Shape { |
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private double radius; |
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public Circle(double radius) { |
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this.radius = radius; |
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} |
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@Override |
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public double getArea() { |
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return Math.PI * radius * radius; |
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} |
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} |
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// 矩形类
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class Rectangle extends Shape { |
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private double width; |
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private double height; |
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public Rectangle(double width, double height) { |
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this.width = width; |
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this.height = height; |
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} |
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@Override |
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public double getArea() { |
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return width * height; |
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} |
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} |
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// 三角形类
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class Triangle extends Shape { |
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private double base; |
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private double height; |
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public Triangle(double base, double height) { |
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this.base = base; |
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this.height = height; |
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} |
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@Override |
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public double getArea() { |
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return 0.5 * base * height; |
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} |
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} |
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// 图形工具类
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class ShapeUtil { |
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public static void printArea(Shape shape) { |
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System.out.printf("该图形的面积为:%.2f%n", shape.getArea()); |
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} |
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} |
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// 主程序入口
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public class ShapeAreaCalculator { |
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public static void main(String[] args) { |
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// 创建不同图形对象
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Shape circle = new Circle(2.0); |
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Shape rectangle = new Rectangle(3.0, 4.0); |
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Shape triangle = new Triangle(3.0, 4.0); |
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// 统一调用工具类打印面积
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System.out.println("圆形:"); |
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ShapeUtil.printArea(circle); |
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System.out.println("矩形:"); |
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ShapeUtil.printArea(rectangle); |
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System.out.println("三角形:"); |
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ShapeUtil.printArea(triangle); |
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} |
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} |
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classDiagram |
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class Shape { |
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<<abstract>> |
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+getArea() double |
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} |
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class Circle { |
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-radius: double |
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+Circle(radius: double) |
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+getArea() double |
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} |
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class Rectangle { |
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-width: double |
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-height: double |
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+Rectangle(width: double, height: double) |
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+getArea() double |
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} |
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class Triangle { |
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-base: double |
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-height: double |
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+Triangle(base: double, height: double) |
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+getArea() double |
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} |
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class ShapeUtil { |
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+printArea(Shape shape) void |
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} |
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Shape <|-- Circle |
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Shape <|-- Rectangle |
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Shape <|-- Triangle |
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ShapeUtil ..> Shape |
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package main.w6; |
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// 1. 抽象动物类
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abstract class Animal { |
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// 抽象方法:动物叫声
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public abstract void makeSound(); |
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} |
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// 2. 游泳接口
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interface Swimmable { |
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void swim(); |
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} |
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// 3. Dog类:继承Animal,实现Swimmable接口
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class Dog extends Animal implements Swimmable { |
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@Override |
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public void makeSound() { |
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System.out.println("小狗汪汪叫~"); |
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} |
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@Override |
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public void swim() { |
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System.out.println("小狗会狗刨游泳"); |
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} |
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} |
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// 4. Cat类:仅继承Animal,不实现Swimmable
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class Cat extends Animal { |
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@Override |
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public void makeSound() { |
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System.out.println("小猫喵喵叫~"); |
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} |
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} |
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// 测试类
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public class AnimalTest { |
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public static void main(String[] args) { |
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// 多态调用:父类引用指向子类对象
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Animal dog = new Dog(); |
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Animal cat = new Cat(); |
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// 调用叫声方法
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System.out.println("=== 动物叫声 ==="); |
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dog.makeSound(); |
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cat.makeSound(); |
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// 只有实现了Swimmable的对象才能调用swim()
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System.out.println("\n=== 游泳能力 ==="); |
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if (dog instanceof Swimmable) { |
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((Swimmable) dog).swim(); |
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} |
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// cat没有实现Swimmable,不能调用swim()
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System.out.println("小猫不会游泳"); |
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} |
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} |
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package w7; |
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public class Pair<K,V> { |
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private K key; |
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private V value; |
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public Pair(K key,V value){ |
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this.key=key; |
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this.value=value; |
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} |
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public K getKey(){ |
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return key; |
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} |
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public V getValue(){ |
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return value; |
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} |
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public static <K, V> Pair<V, K> swap(Pair<K, V> pair) { |
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return new Pair<>(pair.getValue(), pair.getKey()); |
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} |
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} |
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package w7; |
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public class Test { |
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public static void main(String[] args) { |
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// 原始 Pair
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Pair<String, Integer> original = new Pair<>("年龄", 18); |
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System.out.println("交换前:" + original); |
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// 调用静态 swap 方法交换键值
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Pair<Integer, String> swapped = Pair.swap(original); |
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System.out.println("交换后:" + swapped); |
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} |
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} |
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