Question

我打算制作一个程序，询问用户他们想要在车库中存储多少辆车，然后让用户将车辆的信息存入阵列，这是代码：

public class Main {
    static class veh {
        int roda;
        String warna;
        String merk;

        public veh(int roda, String warna, String merk){
            this.roda = roda;
            this.warna = warna;
            this.merk = merk;
        }
        private void setRoda(){
        }
        private void setWarna(){
        }
        private void setMerk(){
        }
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Pemilik Garasi\t: ");
        String nama = in.nextLine();
        System.out.print("NIM\t\t\t\t: ");
        String nim = in.next();
        System.out.print("Kelas\t\t\t: ");
        String kls = in.next();
        System.out.print("Masukkan Luas Garasi\t:");
        int luas = in.nextInt();
        veh[] data = new veh[luas];
        System.out.println("============================");

        for (int i = 0; i < luas; i++) {
            veh vehicle = new veh();
            System.out.println("Masukkan Data Kendaraan Ke " + (i + 1));
            System.out.print("Jumlah Roda\t: ");
            vehicle.setRoda(in.nextInt());
            System.out.print("Warna\t\t: ");
            vehicle.setWarna(in.next());
            System.out.print("Merk\t\t: ");
            vehicle.setMerk(in.next());
            data[i] = vehicle;
        }

        System.out.println("====== GARASI PRIBADI ======");
        System.out.println("Milik \t: " + nama);
        System.out.println("NIM \t: " + nim);
        System.out.println("Kelas \t: " + kls);
        System.out.println("============================");
        for (int i = 0; i < luas; i++) {
            System.out.println("Kendaraan Ke " + (i + 1));
            System.out.println("Jumlah Roda\t : " + data[i].roda);
            System.out.println("Warna\t\t : " + data[i].warna);
            System.out.println("Merk\t\t : " + data[i].merk);
            System.out.println("--------------------------");
        }
    }
}

当我编译它时，我在这一行中出错：

veh vehicle = new veh();
vehicle.setRoda(in.nextInt());
vehicle.setWarna(in.next());
vehicle.setMerk(in.next());

我真的不知道getter / setter如何工作，我是Java编程语言的新手，我写错了什么？

Answer 1

您正在调用没有参数的构造函数，以便执行此操作你需要重载它，因此，声明另一个不带参数的构造函数。

一般来说，setter和getter或封装的想法是阻止直接访问变量本身，并使用函数修改或获取它们的值。你的setter需要接受一个参数并设置你想要的值并且getter返回值。

public class Main {
    static class veh {
        private int roda;
        private String warna;
        private String merk;

        public veh (){}

        public veh(int roda, String warna, String merk){
           this.roda = roda;
           this.warna = warna;
           this.merk = merk;
        }
        public void setRoda(int newRoda){
           roda = newRoda;
        }

         public void setWarna(String newWarna){
           warna  = newWarna;
        }
        public void setMerk(String newMerk){
           merk = newMerk;
        }
        public void getRoda(){
           return roda;
        }

        public void getWarna(){
           retun warna;
        }
        public void getMerk(){
           return merk;
        }

   }

无法应用java方法和构造函数

1 个答案: