Java子類繼承父類是什么？動力節點小編給大家以披薩的選擇實現進行說明。

編寫程序實現比薩制作。需求說明編寫程序，接收用戶輸入的信息，選擇需要制作的比薩。可供選擇的比薩有：培根比薩和海鮮比薩。

實現思路及關鍵代碼

1.分析培根比薩和海鮮比薩

2.定義比薩類

3.屬性：名稱、價格、大小

4.方法：展示

5.定義培根比薩和海鮮比薩繼承自比薩類

6.定義比薩工廠類，根據輸入信息產生具體的比薩對象

Pizza.java

package zuoye;
import java.util.Scanner;
//父類
public class Pizza {
    String name;
    double price;
    int size;
    public Pizza(String name){
        this.name=name;
    }
    public void display(){
        Scanner sc=new Scanner(System.in);
        System.out.println("請輸入披薩大小：");
        size=sc.nextint();
        System.out.println("請輸入披薩價格：");
        price=sc.nextdouble();
    }
}

PeiGen.java

package zuoye;
import java.util.Scanner;
//子類培根披薩
public class PeiGen extends Pizza {
    // double weight;
    public PeiGen(String name) {
        super(name);
    }
    public double peigen() {
        System.out.println("輸入培根克數：");
        Scanner s = new Scanner(System.in);
        return s.nextdouble();
    }
}

SeaFood.java

package zuoye;
import java.util.Scanner;
//子類海鮮披薩
public class SeaFood extends Pizza{
    public SeaFood(String name) {
        super(name);
    }
    public String seafood() {
        System.out.println("輸入配料信息：");
        Scanner s=new Scanner(System.in);
        String peiliao=s.next();
        return peiliao;
    }
}

Work.java

package zuoye;
import java.util.Scanner;
public class Work {
    public static void main(String[] args) {
        System.out.println("請選擇想要的披薩（1.培根披薩 2.海鮮披薩）");
        Scanner s = new Scanner(System.in);
        int n = s.nextint();
        if (n == 1) {
            PeiGen pg = new PeiGen("培根披薩");
            double b=pg.peigen();
            pg.display();
            System.out.println("名稱" + pg.name + "\n價格：" + pg.price + "\n大小：" + pg.size + "\n培根克數：" +b);
        } else if (n == 2) {
            SeaFood sf = new SeaFood("海鮮披薩");
            String a=sf.seafood();
            sf.display();
            System.out.println("名稱" + sf.name + "\n價格：" + sf.price + "\n大小：" + sf.size + "\n配料：" +a);
        }
    }
}

結果展示：