ADD file via upload

Transmission.java

@@ -0,0 +1,119 @@
+package com.automobile.parts;
+
+/**
+ * 变速箱类 - 与汽车是组合关系
+ * 变速箱与引擎和车轮之间也存在关联关系
+ */
+public class Transmission {
+    private String type;
+    private int gearCount;
+    private int currentGear;
+    private boolean automatic;
+    
+    /**
+     * 构造方法 - 创建变速箱时设置默认属性
+     */
+    public Transmission() {
+        this.type = "自动变速箱";
+        this.gearCount = 6;
+        this.currentGear = 0; // 空挡
+        this.automatic = true;
+    }
+    
+    /**
+     * 根据速度换挡
+     * @param speed 当前速度（km/h）
+     */
+    public void shiftGears(int speed) {
+        int newGear;
+        
+        if (speed == 0) {
+            newGear = 0; // 空挡
+        } else if (speed <= 20) {
+            newGear = 1;
+        } else if (speed <= 40) {
+            newGear = 2;
+        } else if (speed <= 60) {
+            newGear = 3;
+        } else if (speed <= 80) {
+            newGear = 4;
+        } else if (speed <= 120) {
+            newGear = 5;
+        } else {
+            newGear = 6;
+        }
+        
+        if (newGear != currentGear) {
+            this.currentGear = newGear;
+            System.out.println("变速箱换挡到 " + getGearName(currentGear));
+        }
+    }
+    
+    /**
+     * 获取档位名称
+     * @param gear 档位号
+     * @return 档位名称
+     */
+    private String getGearName(int gear) {
+        switch (gear) {
+            case 0: return "空挡(N)";
+            case 1: return "1档";
+            case 2: return "2档";
+            case 3: return "3档";
+            case 4: return "4档";
+            case 5: return "5档";
+            case 6: return "6档";
+            default: return "未知档位";
+        }
+    }
+    
+    /**
+     * 手动换挡（模拟手动模式）
+     * @param gear 目标档位
+     */
+    public void manualShift(int gear) {
+        if (gear >= 0 && gear <= gearCount) {
+            this.currentGear = gear;
+            System.out.println("手动换挡到 " + getGearName(gear));
+        } else {
+            System.out.println("无效的档位选择");
+        }
+    }
+    
+    /**
+     * 切换到倒挡
+     */
+    public void reverse() {
+        this.currentGear = -1;
+        System.out.println("切换到倒挡(R)");
+    }
+    
+    // Getter 和 Setter 方法
+    public String getType() {
+        return type;
+    }
+    
+    public void setType(String type) {
+        this.type = type;
+    }
+    
+    public int getGearCount() {
+        return gearCount;
+    }
+    
+    public void setGearCount(int gearCount) {
+        this.gearCount = gearCount;
+    }
+    
+    public int getCurrentGear() {
+        return currentGear;
+    }
+    
+    public boolean isAutomatic() {
+        return automatic;
+    }
+    
+    public void setAutomatic(boolean automatic) {
+        this.automatic = automatic;
+    }
+}