如何编写程序打印指定XX网格？技术实现咨询

API 探路者

2026-5-21

Hey there! Let's build this Java program exactly how you need it. You want a tool that prompts for height and width, validates inputs to ensure they're valid, then prints a grid of X-based cells matching your specified format. Here's the full solution:

Complete Working Code

import java.util.Scanner;

public class Loops {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int height = 0;
        int width = 0;

        // Input validation loop: ensure both values are greater than 1
        while (height <= 1 || width <= 1) {
            // Show error message only after first failed input attempt
            if (height != 0 || width != 0) {
                System.out.println("Invalid height or width value");
            }

            System.out.print("Type in the height: ");
            height = input.nextInt();

            System.out.print("Type in the width: ");
            width = input.nextInt();
        }

        // Create a single "cell" with X's matching the input width
        String cell = "X".repeat(width);

        // Print the grid: repeat the cell 'height' times, separated by spaces
        for (int i = 0; i < height; i++) {
            if (i > 0) {
                System.out.print(" ");
            }
            System.out.print(cell);
        }

        input.close();
    }
}

How It Works

Input Handling & Validation: We initialize height and width to 0, then use a while loop to keep asking for inputs until both values are greater than 1. We avoid showing the error message on the first run to keep the initial prompt clean.
Cell Creation: Using String.repeat(width), we generate a string of X's that matches the input width (e.g., width=2 gives "XX").
Grid Printing: We loop height times to print the cell repeatedly, adding a space before every cell except the first to match your desired output format.