update:demo4

.gitignore

@@ -1 +1,95 @@
+### Compiled class files
+*.class
+
+### Log files
+*.log
+
+### BlueJ files
+*.ctxt
+
+### Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+### Package Files
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+### VM crash logs
+hs_err_pid*
+replay_pid*
+
+# ========================
+# Maven
+# ========================
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+# ========================
+# Gradle
+# ========================
+.gradle/
+build/
+!gradle-wrapper.jar
+!*/src/main/**/build/
+!*/src/test/**/build/
+
+### Avoid ignoring Gradle wrapper
+gradle-app.setting
+
+# ========================
+# IntelliJ IDEA
+# ========================
+.idea/
+*.iml
+*.ipr
+*.iws
+out/
+
+# ========================
+# Eclipse
+# ========================
+.project
+.classpath
+.cproject
+.settings/
+bin/
+tmp/
+
+# ========================
+# NetBeans
+# ========================
+nbproject/private/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+
+# ========================
+# VS Code
+# ========================
+.vscode/
+
+# ========================
+# OS files
+# ========================
+# macOS
+.DS_Store
+
+# Windows
+Thumbs.db
+
+#local
 com/study/test/

com/study/demo4/AlipayPayment.java

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+package com.study.demo4;
+
+class AlipayPayment implements PaymentProcessor {
+  @Override
+  public boolean pay(double amount) {
+    System.out.println("支付宝支付: " + amount);
+    return true;
+  }
+}

com/study/demo4/BikeDeliveryCalculator.java

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+package com.study.demo4;
+
+class BikeDeliveryCalculator implements DeliveryFeeCalculator {
+  @Override
+  public double calculateFee(double distance) {
+    if (distance <= 5) {
+      return 5.0; // 起步价
+    }
+    return 5.0 + (distance - 5) * 1.5;
+  }
+}

com/study/demo4/Cardeliverycalculator.java

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+package com.study.demo4;
+
+class CarDeliveryCalculator implements DeliveryFeeCalculator {
+  @Override
+  public double calculateFee(double distance) {
+    if (distance <= 5) {
+      return 10.0; // 起步价
+    }
+    return 10.0 + (distance - 5) * 2.0;
+  }
+}
+

com/study/demo4/CreditCardPayment.java

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+package com.study.demo4;
+
+class CreditCardPayment implements PaymentProcessor {
+  @Override
+  public boolean pay(double amount) {
+    System.out.println("银行卡支付: " + amount);
+    return true;
+  }
+}

com/study/demo4/DeliveryFeeCalculator.java

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+package com.study.demo4;
+
+interface DeliveryFeeCalculator {
+  double calculateFee(double distance);
+}

com/study/demo4/HomeAppliance.java

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+package com.study.demo4;
+
+abstract class HomeAppliance implements SmartDevice {
+  protected String name;
+  protected boolean isOn;
+
+  public HomeAppliance(String name) {
+    this.name = name;
+    this.isOn = false;
+  }
+
+  @Override
+  public void turnOn() {
+    isOn = true;
+  }
+
+  @Override
+  public void turnOff() {
+    isOn = false;
+  }
+
+  @Override
+  public String getStatus() {
+    return name + " is " + (isOn ? "ON" : "OFF");
+  }
+}

com/study/demo4/HomeController.java

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+package com.study.demo4;
+
+import java.util.ArrayList;
+import java.util.List;
+
+class HomeController {
+  private List<SmartDevice> devices = new ArrayList<>();
+
+  public void addDevice(SmartDevice device) {
+    devices.add(device);
+  }
+
+  public String getDeviceStatus(String name) {
+    for (SmartDevice device : devices) {
+      if (device.getStatus().contains(name)) {
+        return device.getStatus();
+      }
+    }
+    return "Device not found";
+  }
+}

com/study/demo4/PaymentFactory.java

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+package com.study.demo4;
+
+class PaymentFactory {
+  public static PaymentProcessor getProcessor(String type) {
+    switch (type.toLowerCase()) {
+      case "wechat":
+        return new WechatPayment();
+      case "alipay":
+        return new AlipayPayment();
+      case "card":
+        return new CreditCardPayment();
+      default:
+        throw new IllegalArgumentException("不支持的支付方式");
+    }
+  }
+}

com/study/demo4/PaymentProcessor.java

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+package com.study.demo4;
+
+interface PaymentProcessor {
+  boolean pay(double amount);
+}
+

com/study/demo4/SmartAirConditioner.java

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+package com.study.demo4;
+
+class SmartAirConditioner extends HomeAppliance {
+  public SmartAirConditioner(String name) {
+    super(name);
+  }
+}

com/study/demo4/SmartDevice.java

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+package com.study.demo4;
+
+interface SmartDevice {
+  void turnOn();
+  void turnOff();
+  String getStatus();
+}

com/study/demo4/SmartLight.java

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+package com.study.demo4;
+
+class SmartLight extends HomeAppliance {
+  public SmartLight(String name) {
+    super(name);
+  }
+}

com/study/demo4/SmartMasher.java

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+package com.study.demo4;
+
+class SmartMasher extends HomeAppliance {
+  public SmartMasher(String name) {
+    super(name);
+  }
+}

com/study/demo4/TestControl.java

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+package com.study.demo4;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class TestControl {
+  public static void main(String[] args) {
+    HomeController controller = new HomeController();
+
+    // 创建设备
+    SmartLight light = new SmartLight("Living Room Light");
+    SmartAirConditioner ac = new SmartAirConditioner("Bedroom AC");
+    SmartMasher masher = new SmartMasher("Kitchen Masher");
+
+    // 添加到控制器
+    controller.addDevice(light);
+    controller.addDevice(ac);
+    controller.addDevice(masher);
+
+    // 测试设备状态
+    light.turnOff();
+    ac.turnOff();
+    masher.turnOn();
+
+    // 查询状态
+    System.out.println(controller.getDeviceStatus("Living Room Light"));
+    System.out.println(controller.getDeviceStatus("Bedroom AC"));
+    System.out.println(controller.getDeviceStatus("Kitchen Masher"));
+    System.out.println(controller.getDeviceStatus("Non-existent Device"));
+  }
+}

com/study/demo4/TestPay.java

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+package com.study.demo4;
+
+public class TestPay {
+  public static void main(String[] args) {
+    PaymentProcessor processor = PaymentFactory.getProcessor("alipay");
+    processor.pay(666.0);
+  }
+}

com/study/demo4/TestTransport.java

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+package com.study.demo4;
+
+public class TestTransport {
+  public static void main(String[] args) {
+    // 测试自行车配送
+    DeliveryFeeCalculator bike = new BikeDeliveryCalculator();
+    System.out.println("自行车配送 3km: ¥" + bike.calculateFee(3));
+    System.out.println("自行车配送 8km: ¥" + bike.calculateFee(8));
+
+    // 测试汽车配送
+    DeliveryFeeCalculator car = new CarDeliveryCalculator();
+    System.out.println("汽车配送 3km: ¥" + car.calculateFee(3));
+    System.out.println("汽车配送 8km: ¥" + car.calculateFee(8));
+
+    // 对比不同距离的费用
+    System.out.println("\n费用对比:");
+    for (int km = 1; km <= 10; km++) {
+      System.out.printf("%dkm: 自行车¥%.1f, 汽车¥%.1f%n",
+          km, bike.calculateFee(km), car.calculateFee(km));
+    }
+  }
+}

com/study/demo4/WechatPayment.java

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+package com.study.demo4;
+
+class WechatPayment implements PaymentProcessor {
+  @Override
+  public boolean pay(double amount) {
+    System.out.println("微信支付: " + amount);
+    return true;
+  }
+}