Question

import java.util.Scanner;

public class CarTest {

    /**
 * @param args
 */
public static void main(String[] args) { 
    //create a Scanner object
    Scanner input = new Scanner(System.in);

    /**
     *Creates a car! object from the Car class
     *with the passing of these arguments
     *year, make, model, price
     */
    Car car1 = new Car("2008", "Nissan", "Pathfinder", "10,000");

    //display toString using car1 object
    System.out.println(car1.toString());

    //user input for year
    System.out.println("Please list your automobile for sale: " +
        "\nPlease enter the year? ");
    //String newYear variable is created for CarTest class
    String newYear = input.nexLine();
    //set year in car class for Car1 object to String newYear
    car1.setYear(newYear);

    //user input for make
    System.out.println("Please enter the make? ");
    //String newMake variable is created for CarTest class

        String newMake = input.nextLine();
    //set make in car class for Car1 object to String newMake
    car1.setMake(newMake);

    //user input for model
    System.out.println("Please Enter the model?");
    //String newModel variable is created for CarTest class
    String newModel = input.nextLine();
    //set model in car class for Car1 object to String newModel
    car1.setModel(newModel);

    //user input for price
    System.out.println("How much would you sell your car for?");
    //String newPrice variable is created for CarTest class

    String newPrice = input.nextLine();

    //set price in car class for Car1 object to String newPrice
    car1.setPrice(newPrice);

    //displays the new info to the screen
    System.out.println(car1.toString());
    }
}

来自

public class Car {

    //class variables are created
    private String year;
    private String make;
    private String model;
    private String price;

    //default constructor
    public Car() {
    }

    //constructor with arguments
    public Car(String year, String make, String model, String price) {
    this.year = year;
    this.model = model;
    this.make = make;
    this.price = price;
    }

    //get make of the vehicle
    public String getMake() {
    return make;
    }

    //set make for vehicle
    public void setMake(String make) {
    this.make = make;
    }

    //get model of the vehicle
    public String getModel(){
    return model;
    }

    //set model for vehicle
    public void setModel(String model) {
    this.model = model;
    }

    //get price of the vehicle
    public String getPrice() {
    return price;
    }

    //set price for vehicle
    public void setPrice(String price) {
    this.price = price;
    }

    //get year of the vehicle 
    public String getYear() { 
    return year;
    }

    //set year for vehicle
    public void setYear(String year) {
    this.year = year;
    }

    public String toString() {
    return "For Sale By Owner: " + year + " " + make + " " + model + 
            "\nSelling Price: $" + price + "\n ";
    }
}

当我上周递交作业时，它工作正常，但是今天，当我来到我的电脑上完成新的作业时，我在我的car.java和{{1}上找到了红色的x }}

我的日食说：来自carTest.java的错误充满了： carTest.java

错误是我定义CAR1的方式： error: main method not found in class homework.cartest. please define the main method public static void main(String[] args)

以及我获得输入的方式

Car car1 = new Car("2008", "Nissan", "Pathfinder", "10,000");

将String newYear = input.nexLine(); String newMake = input.nextLine(); String newModel = input.nextLine(); String newPrice = input.nextLine();加下划线为eclipse中的代码中的错误。

也在input.nextLine();。方法Car.java会导致错误说明String toSTring()

当我递给它并获得好成绩时，它工作得很好，但今天我注意到我的代码是错误的，昨天一切都好吗？

Answer 1

清理并构建项目。可能是您的Java构建路径的异常

Answer 2

文件是否列在包/项目作业下？

如果没有，请正确阅读您的错误消息，您正在尝试运行不存在的内容。

与此同时，如上所述，您可能遇到了文件路径问题。创建一个新项目并复制粘贴代码（重构的副本）通常是最快的解决方案。

Answer 3

复制您的项目并运行它。唯一有问题的是：

String newYear = input.nexLine();

应该是：

String newYear = input.nextLine();

其余的，它运作正常。

在toString方法中，您应添加@override注释

@Override
public String toString() {
    return "For Sale By Owner: " + year + " " + make + " " + model
            + "\nSelling Price: $" + price + "\n ";
}

还要确保您的项目名为CarTest，源包package cartest

为什么我的代码今天错误并且昨天没问题？

3 个答案: