ADD file via upload

SteeringWheel.java

@@ -0,0 +1,53 @@
+package com.car.model;
+
+/**
+ * 方向盘类 - 汽车的组件
+ * 与Car类是组合关系
+ */
+public class SteeringWheel {
+    private String material; // 材质
+    private String diameter; // 直径
+    private boolean hasAirbag; // 是否有安全气囊
+    
+    /**
+     * 构造方法
+     * @param material 方向盘材质
+     * @param diameter 方向盘直径
+     * @param hasAirbag 是否有安全气囊
+     */
+    public SteeringWheel(String material, String diameter, boolean hasAirbag) {
+        this.material = material;
+        this.diameter = diameter;
+        this.hasAirbag = hasAirbag;
+    }
+    
+    // getter and setter methods
+    public String getMaterial() {
+        return material;
+    }
+    
+    public void setMaterial(String material) {
+        this.material = material;
+    }
+    
+    public String getDiameter() {
+        return diameter;
+    }
+    
+    public void setDiameter(String diameter) {
+        this.diameter = diameter;
+    }
+    
+    public boolean hasAirbag() {
+        return hasAirbag;
+    }
+    
+    public void setAirbag(boolean hasAirbag) {
+        this.hasAirbag = hasAirbag;
+    }
+    
+    @Override
+    public String toString() {
+        return "SteeringWheel [material=" + material + ", diameter=" + diameter + ", hasAirbag=" + hasAirbag + "]";
+    }
+}