java - 我将如何嵌入用户界面来使用数组列表而不是我已经拥有的数组来输入各种类型的汽车

Question

这是我的课

package javaapplication1;

public class Car {

private String model;
private String reg;
private String colour;
private double litreEngine;

//Default Constructor
public Car() {
    model = null;
    reg = null;
    colour = null;
    litreEngine = -1;
}

public Car(String startModel, String startReg, String startColour, double startLitreEngine) {
    model = startModel;
    reg = startReg;
    colour = startColour;
    litreEngine = startLitreEngine;
}




//Prints out Car attributes

public void print() {
    System.out.println("Model:" + model + "Reg:" + reg + "Colour:" + colour + "litreEngine:" + litreEngine);
}

public String toString() {
   return ("Model:" + model + " Reg: " + reg + " Colour: " + colour + " Litre Engine: " + litreEngine);
}

//Get and set Methods
public String getModel() {
    return model;
}

public String getReg() {
    return reg;
}

public String getColour() {
    return colour;
}

public double getLitreEngine() {
    return litreEngine;
}

public void setModel(String new_model)
{
    model = new_model;
}

public void setReg(String new_Reg)
    {
        reg = new_Reg;
}

public void setnumberOfHoursPerWeek(String new_colour)
{
            colour = new_colour;
}

public void setcompulsory(double new_litreEngine)
{
            litreEngine = new_litreEngine;
}

}

这是我的测试课

package javaapplication1;

import java.util.Scanner;

public class CarTestApp {

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    Car[] values = new Car[4];
    int i = 0;
    String Continue = "Y";
    String Stop = "N";
    String answer = null;

    //Car c = new Car("VW Golf", "01D1234", "Red", 1.6);
    //Car d = new Car("Mazda MX-5", "03WW324", "Olive", 1.6);
    //Car e = new Car();

    // Creates car details from user input.
    do {
        System.out.println("Enter model details: ");
        String model = in.nextLine();

        System.out.println("Enter reg details: ");
        String reg = in.nextLine();

        System.out.println("Enter colour details: ");
        String colour = in.nextLine();

        System.out.println("Enter engine details:(Number) ");
        String line = in.nextLine();
        double litreEngine = Double.parseDouble(line);
        //double litreEngine = in.nextDouble();

        Car one = new Car(model, reg, colour, litreEngine);
        values[i] = one;
        i++;

        if (i < values.length) {
            System.out.println("Do you want to add another car?(Y/N)");
            answer = in.nextLine();
        }
    } while (answer.equalsIgnoreCase(Continue) && i < values.length);



    System.out.println("Thank you for inputting this information");

    System.out.println(values[0]+"\t"+values[1]+"\t"+values[2]+"\t"+values[3]);
}
}

Answer 1

我认为您需要一个菜单​​驱动的程序来与用户交互以执行不同的任务。

首先，您需要不同的方法，这将完成添加汽车的工作。然后你可以有一个开关盒，它可以处理你的各种情况。

public static void main(String args) {

    int choice = 0;
    char redo = 'n';

    do {   
        System.out.println("Enter your choice:");
        System.out.println("1. Add a car \n 2. Exit");

        choice = /** Read choice from user **/

        switch (choice) {
              case 1: addCar();                          
                      System.out.println("Do you want to continue? (Y or N)?");
                      redo = /** read char from user ('y' or 'n') **/
                      break;

              case 2: redo = 'n';
                      break;
        }

    } while (redo == 'Y' || redo == 'y'));
}

public static void addCar() {
    // Add the Car adding logic here
}

您可以声明一个可以动态增加大小的，而不是使用Arrayfor storage 。而且您需要在您的主要方法之外将其声明为实例变量。CarsArrayList