Question

好的，我有一个项目要做，我需要一些帮助。我只能使用While语句，（不是），我需要创建一个星号框，因此用户可以输入框的宽度和长度，如何制作框？因为我完成了顶线和底线，但我不知道如何做中线，所以两边都是a *，中间是空格。以下是我到目前为止的情况，请记住这只是我用Java编写的第4个月。

import java.util.Scanner;

public class Client {
    private static int width, length = 0;
    //Program 2
    public static void input(){
        Scanner console = new Scanner(System.in);
        System.out.print("What is the width? ");
        width = console.nextInt();
        System.out.print("What is the length? ");
        length = console.nextInt();
    }
    public static void topBottom(int width){
        while(width >= 1){
            System.out.print("x");
            width--;
        }
    }
    public static void length(int length){ //this is mainly where i need help
        int num = length - 2; //num is for the spaces in between the two * in the middle
        while(length >= 3){ //I have no idea how to create the box effect
            System.out.println("x");
            while(num >= 0){
                System.out.print(" ");
                num--;
            }
            length--;
        }
    }
    public static void main(String[] args) {
        input();
        topBottom(width);
        System.out.println("");
        length(length);
        topBottom(width);
    }

}

Answer 1

你必须在length()做同样的事情，即做一个减去2的循环，但对于每一行：

public static void width(int width){
    int num = width - 2;
    System.out.print("x");      // Print the leftmost 'x'
    while(num > 0){             // Repeat for each column
        System.out.print(" ");  // Print a space
        num--;
    }
    System.out.println("x"); // Print the rightmost 'x' and change line
}
public static void main(String[] args) {
    input();
    topBottom(width);          // Print header
    System.out.println();
    int rows = length - 2;
    while (rows > 0) {         // Repeat for each of the rows, minus 2 (top and bottom)
        width(width);
        rows--;
    }
    topBottom(width);          // Print footer
    System.out.println();
}

您还将宽度和长度概念混淆了。假设您总是想要打印第一行和最后一行，即打印小于2x2的盒子是没有意义的。

此外，请注意，由于已经存储了width和length，因此无需通过。{/ p>

Answer 2

如何在不知道宽度的情况下计划长度尝试此

 public static void length(int length,int width){ //this is mainly where i need help
    int num = length - 2; //num is for the spaces in between the two * in the middle
    int num2= width-2;

    while(num >= 0){ //I have no idea how to create the box effect
        System.out.print("x");
        while(num2 >= 0){
            System.out.print(" ");
            num2--;
        }
        System.out.print("x");
        System.out.println();

        num2=width-2;
        num--;
    }
}

如何仅使用While循环制作一个盒子？

2 个答案: