Question

我写了两节课。主类运行程序。它要求用户输入。根据用户输入，第二个类将打印出一个正方形。每个正方形将打印----为每个数字和|对于墙壁的每个数字。

例如，假设用户输入了两个。在这种情况下，它会打印出一个正方形。

----- -----
|         | 
|         | 
----- -----

问题在于我无法根据用户输入获得正方形增长。

这是主要的课程

import java.util.Scanner;

public class Assignment4 
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);

        SquareBuilder square = new SquareBuilder(scan.nextInt());

        System.out.print(square.toString());
        square.changeSize(scan.nextInt());
        System.out.print(square.toString());
        square.changeSize(scan.nextInt());
        System.out.print(square.toString());
        square.changeSize(scan.nextInt());
        System.out.print(square.toString());
        square.changeSize(scan.nextInt());
        System.out.print(square.toString());
    }
}

public class SquareBuilder
{
    final private int LENGTH_RATIO = 4;
    final private String CEILING_FLOOR = "----";
    private int size;
    private int spaces;
    private String square;      

    public SquareBuilder(int size) 
    {
        this.size = size;
        constructSquare();
    }

    private void spaces()
    {
         spaces = LENGTH_RATIO * size - 2;
    }

    private void ceilingAndFloor()
    {
        square += "\n";
        for (int i = 0; i < size; ++i)
        {
            square += CEILING_FLOOR;
        }
    }

    private void walls()
    {
        for (int i = 0; i < size; ++i )
        {
            square +="\n|";

            for (int j = 0; j < spaces; ++j)
            {
                square +=" ";
            }

            square +="|";
        }
    }

    private void constructSquare()
    {
        spaces ();
        square = "";

        ceilingAndFloor();
        walls();
        ceilingAndFloor();

    }

    public int area()
    {
        return size * size;
    }

    public void changeSize(int size)
    {
        this.size = size;
    }

    public String toString()
    {
        String retVal = square;
        retVal += "\nSize: " + size + " Area: " + area();

        return retVal;
    }
}

Answer 1

你甚至没有改变渲染方块的部分。

我认为您想要从constructSquare()方法调用changeSize()方法，或至少在再次打印之前调用constructSquare()

Answer 2

将constructSquare（）放在changeSize函数中。所需的变更：

public SquareBuilder(int size) 
    {

        changeSize( size);

    //    constructSquare();
    }

    public void changeSize(int size)
    {

        this.size = size;
        constructSquare();

    }

修复根据用户输入增长的方块

2 个答案: