java - 我对这个 Java 构造函数程序有疑问

Question

这个问题已经有答案了:

Scanner is skipping nextLine() after using next() or nextFoo()? (25 个回答)

已关闭 8 年前。

这是类(class):

public class Rectangle { 

private double lenght ;
private double width ;
public String name ;

public Rectangle (double len, double w, String n)

{
    lenght = len;
     width = w;
     name = n;
}

 public double getLenght()
 {
    return  lenght ;
 }

 public double getWidth ()
 {
     return width ;
 }

 public String getName() 
 {
     return name ;
 }

 public double getArea ()
 {
     return lenght * width  ;
 }

}

这是我的构造函数:

public class roomConstructor {

public static void main(String[] args) {


    double roomLenght, roomWidht,  totalArea;
    String roomName;

    Rectangle kitchen, bedroom, den;

    Scanner keyboard = new Scanner (System.in);
    System.out.println("What is the name of your kitchen? " );
    roomName = keyboard.nextLine();
    System.out.println("What is the lenght of the kitchen ? " );
    roomLenght = keyboard.nextDouble();
    System.out.println("What is the widht of the kitchen ? ");
    roomWidht =keyboard.nextDouble();
    kitchen = new Rectangle(roomLenght, roomWidht, roomName );

    System.out.println("What is the name of your bedroom? " );
    roomName = keyboard.nextLine();
    keyboard.nextLine();
    System.out.println("What is the lenght of the bedroom ? ");
    roomLenght = keyboard.nextDouble();
    System.out.println("What is your bedroom withd ? ");
    roomWidht = keyboard.nextDouble();
    bedroom = new Rectangle(roomLenght,roomWidht, roomName );

    System.out.println("What is the name of your den? " );
    roomName = keyboard.nextLine();
    keyboard.nextLine();
    System.out.println(" What is the lenght of your den ? ");
    roomLenght =keyboard.nextDouble();
    System.out.println("What is the widht of your den ? ");
    roomWidht =keyboard.nextDouble();
    den = new Rectangle ( roomLenght, roomWidht,roomName);

    totalArea = kitchen.getArea() + bedroom.getArea() + den.getArea();

    System.out.println(" The total area of your room is : " + totalArea);
    System.out.println(" The name of your kitchen is : " + kitchen.getName());
    System.out.println(" The name of your kitchen is : " + bedroom.getName());
    System.out.println("The name of your bedroom is : " + den.getName());
    System.out.println("The lenght of the kitchen is : " + bedroom.getLenght());


}

}

当我尝试获取卧室或书房名称时，缺少我得到的所有名称答案是厨房，然后有 2 个空白答案 5l 缺少卧室和书房名称)我该怎么办？感谢您的帮助

Answer 1

Keyboard.nextDouble() 不使用 newLine 字符。每次调用 Keyboard.nextDouble() 后调用 Keyboard.nextLine()。

这会破坏构造函数中的数据存储，因为在不使用 \n 字符时输入不匹配