Question

我正在尝试在班级Address中创建扫描仪方法，因此我不必在每个需要用户输入的方法中重复扫描器代码。我遇到的问题是，当我在Address类的实例的测试程序中运行这两个set方法时，此方法似乎只返回我的实例变量值而不是用户的扫描程序输入。

我该怎么做？我不想在每一种方法中重复scr.nextInt()等。

    
//Scanner method for integer inputs from user.
public int scanInt(){
    int userInt = scr.nextInt();
    scr.nextLine();
    return userInt;
}

//Scanner method for string inputs from user
public String scanLine(){
    String userString = scr.nextLine();
    return userString;
}
	
//in these methods below (and others) I want to use the above scanner methods so I don't have to repeat the code for scanner inputs in every single method.

public void setStreet(){
    System.out.println("Skriv in gata: ");
    scanLine();
}

public void setStreetNr(){
    System.out.println("Skriv in gatunummer: ");
    scanInt();
}

Answer 1

public void setStreet(){
    System.out.println("Skriv in gata: ");
    street = scanLine();
}

Answer 2

听起来您正在使用BlueJ或其他程序测试您的课程。如果是这种情况，请尝试这个课程。

import java.util.Scanner;
public class Address
{
    String street;
    int streetNr;
    Scanner scr = new Scanner(System.in);

    //Scanner method for integer inputs from user.
    public int scanInt()
    {
        int userInt = scr.nextInt();
        scr.nextLine();
        return userInt;
    }

    //Scanner method for string inputs from user
    public String scanLine()
    {
        String userString = scr.nextLine();
        return userString;
    }

    public void setStreet()
    {
        System.out.println("Skriv in gata: ");
        street = scanLine();
    }

    public void setStreetNr()
    {
        System.out.println("Skriv in gatunummer: ");
        streetNr = scanInt();
    }
}

这应该像你描述的那样工作。创建类的实例，调用这两个方法并检查对象的参数。此代码将输入分配给每个方法的变量。

对类中的多个set方法使用scanner方法

2 个答案: