在對象類中添加掃描儀

Question

我有運行得很好的代碼，但是我希望用戶自己執行此操作，而不是為對象添加變量。 但是我不知道該怎么做。

在演示/驅動程序中演示該類，該程序要求用戶輸入兩塊土地的尺寸。 程序應演示toString方法以顯示每個土地區域的尺寸和面積，並使用equals方法指示這些區域的大小是否相等，即區域是否具有相同的面積。

對象類：

public class MitchellLandTract
{
    private int length;
    private int width;
    private int area;

    /**
     * Constructor
     * @param l length
     * @param w width
     */
    public MitchellLandTract(int l, int w)
    {
        length = l;
        width = w;
    }

    /**
    * toString for the land tract
    * @param str the string describing the object
    */
    public String toString()
    {
        // Create a string describing the land tract.
        String str = "With the width, " + width +
              ", and the length, " + length +
              ". The area is " + area;

        // Return the string.
        return str;
    }

    /**
    * getLength method
    * @return area of land tract
    */
    public double getArea()
    {
        area = length * width;
        return area;
    }

    /**
    * equals method
    * @param object2 the object being compared to original
    * @return if the areas are the same or different
    */
    public boolean equals(MitchellLandTract object2)
    {
        boolean status;

        // Determine whether this object's area field
        // is equal to object2's area field
        if (getArea()==object2.getArea())
            status = true;  // Yes, the objects are equal.
        else
            status = false; // No, the objects are not equal.

        // Return the value in status.
        return status;
    }

主要方法：

public class MitchellLab8
{
    public static void main(String[] args)
    {
         // Create two MitchellLandTract objects with the same values
         MitchellLandTract land1 = new MitchellLandTract(5, 10);
         MitchellLandTract land2 = new MitchellLandTract(4, 16);

         // Use the equals method to compare the objects
         if (land1.equals(land2))
             System.out.println("Both objects are the same.");
         else
             System.out.println("The objects are different.");

         // Display the objects' values
         System.out.println("For the first tract of land: " + land1);
         System.out.println("For the second tract of land: " + land2);
    }
}

Answer 1

嘗試

import java.util.Scanner;

方法主要

public static void main(String[] args)
{

    Scanner scan = new Scanner(System.in);

    System.out.println("Input Land 1");
    int land1_A_Input = scan.nextInt();
    int land1_B_Input = scan.nextInt();

    System.out.println("Input Land 1");
    int land2_A_Input = scan.nextInt();
    int land2_B_Input = scan.nextInt();

     // Create two MitchellLandTract objects with the same values
     MitchellLandTract land1 = new MitchellLandTract(land1_A_Input, land1_B_Input);
     MitchellLandTract land2 = new MitchellLandTract(land2_A_Input, land2_B_Input);

     // Use the equals method to compare the objects
     if (land1.equals(land2))
         System.out.println("Both objects are the same.");
     else
         System.out.println("The objects are different.");

     // Display the objects' values
     System.out.println("For the first tract of land: " + land1);
     System.out.println("For the second tract of land: " + land2);
}

產量

Input Land 1
4 5
Input Land 1
10 5
The objects are different.
For the first tract of land: With the width, 5, and the length, 4. The area is 20
For the second tract of land: With the width, 5, and the length, 10. The area is 50