如何在Java中打印给定的菱形图案? [英] How to print a given diamond pattern in Java?

问题描述

***********
***** *****
****   ****
***     ***
**       **
*         *
**       **
***     ***
****   ****
***** *****
***********

基本上，我只需要正确放置空格的想法.到目前为止，我的代码.

Basically I just need the idea to put the spaces correctly. My code so far.

public class Pyramid3 {

    public static void main(String[] args) {

        int i, j;
        int noOfCol = 11;

        for (i = 1; i <= 11; i++) {

            for (j = 1; j <= noOfCol; j++) {
                System.out.print("*");
            }

            System.out.println();

            if (i == 1) {
                noOfCol--;
            } else if (i > 1 && i < 6) {
                noOfCol = noOfCol - 2;
            } else if (i > 6) {
                noOfCol = noOfCol + 2;
            }
        }
    }
}

推荐答案

这是代码，对不起，文档不好，希望对您有所帮助.

This is the code, sorry for bad documentation, hope it helps.

PS:要解决类似这样的问题，只需使用白皮书和铅笔，然后将列和索引"i"制成网格，然后找出一个关系，然后将其用作循环条件即可.

PS: to solve any problem like this, just use a white paper and a pencil then make grids of columns and the index 'i' then figure a relation, then you can use it as loop condition.

public class Test {
    public static void main(String[] args) {
        int n = 10;

        // Top
        for (int i = n; i > 0; i--) {
            // Stars
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            // Spaces
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            // Stars
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            // Stars
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }

        // Bottom
        for (int i = 2; i < n + 1/* Note the shift here */; i++) {
            // Stars
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            // Spaces
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            // Spaces
            for (int j = i; j < n; j++) {
                System.out.print(" ");
            }
            for (int j = 0; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

希望它会有所帮助:)

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