技術標籤：Java

編寫汽車類

Problem Description

1.實驗目的
    (1) 熟悉類的建立方法
    (2) 掌握物件的宣告與建立
    (3) 能利用面向物件的思想解決一般問題
 
2.實驗內容 
   編寫一個java程式，設計一個汽車類Vehicle，包含的屬性有車輪的個數wheels和車重weight。小汽車類Car是Vehicle的子類，包含的屬性有載人數loader。卡車類Truck是Car類的子類，其中包含的屬性有載重量payload。每個類都有構造方法和輸出相關資料的方法。

3.實驗要求
   補充完整下面的程式碼

  public class Main{
    public static void main(String[] args){
        Vehicle v=new Vehicle(8,10.00);
        smallCar c=new smallCar(6);
        Truck t=new Truck(10);
        v.disMessage();
        c.disM();
        t.disM2();
        t.disM3();
   }
}
    // 你的程式碼
 

Output Description

The number of wheels in this car is 8, weight is 10.0
This car can carry 6 persons
The load of this truck is 10
The number of wheels in this truck is 8, weight is 10.0, can carry 6 persons, load of this truck is 10

解題程式碼

// Vehicle 類
class Vehicle{
    // wheels 車輪個數
    public int wheels;
 

	// 重量
    public double weight;

    // 帶參構造方法
    public Vehicle(int wheels, double weight) {
        this.wheels = wheels;
        this.weight = weight;
    }
	
    // 無參構造方法
    public Vehicle() {
    }
	
    // 列印資訊
    public void disMessage(){
        System.out.println("The number of wheels in this car is "
 
 + wheels + ", weight is " + weight);
    }
}

// smallCar類繼承Vehicle類
class smallCar extends Vehicle{
    // loader 載人數
    public int loader;
	// 帶參構造 三個引數
    public smallCar(int wheels, double weight, int loader) {
        // 呼叫父類構造器
        super(wheels, weight);
        this.loader = loader;
    }

    // 帶參構造 一個引數
    public smallCar(int loader) {
        // 呼叫父類構造 根據題目輸出 wheels = 8 weight10.00
        super(8, 10.00);
        this.loader = loader;
    }
	
    // 無參構造
    public smallCar() {
    }
	// 列印資訊
    public void disM(){
        System.out.println("This car can carry " + loader + " persons");
    }
}
// Truck類繼承smallCar類
class Truck extends smallCar{
    // payload 載重量
    private int payload;
	
    // 帶參構造 一個引數
    public Truck(int payload) {
        // 呼叫父類構造 根據題目輸出 loader = 6
        super(6);
        this.payload = payload;
    }
	
    // 帶參構造 四個引數
    public Truck(int wheels, double weight, int loader, int payload) {
        // 呼叫父類構造
        super(wheels, weight, loader);
        this.payload = payload;
    }
	// 無參構造
    public Truck() {
    }
	
    // 列印資訊
    public void disM2(){
        System.out.println("The load of this truck is " + payload);
    }

    // 列印資訊
    public void disM3(){
        System.out.println("The number of wheels in this truck is " + wheels + ", weight is " + weight + ", can carry " + loader + " persons, load of this truck is " + payload);
    }
}