java 打印菱形算法

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实心菱形：
打印效果图

算法如下：

public void print(int num) {    for (int a = 1; a <= num; a++) {        for (int b = 1; b <= num - a; b++) {            System.out.print(" ");        }        for (int b = 1; b <= a; b++) {            System.out.print("* ");        }        System.out.println();    }    for (int a = num - 1; a > 0; a--) {        for (int b = 1; b <= num - a; b++) {            System.out.print(" ");        }        for (int b = 1; b <= a; b++) {            System.out.print("* ");        }        System.out.println();    }}

空心菱形：
打印效果图

算法如下：

public void print(int num) {    for (int a = 1; a <= num; a++) {        for (int b = 1; b <= num - a; b++) {            System.out.print(" ");        }        System.out.print("*");        if (a != 1) {            for (int b = 1; b < 2 * a - 2; b++) {                System.out.print(" ");            }            System.out.print("*");        }        System.out.println();    }    for (int a = num - 1; a > 0; a--) {        for (int b = 1; b <= num - a; b++) {            System.out.print(" ");        }        System.out.print("*");        if (a != 1) {            for (int b = 1; b < 2 * a - 2; b++) {                System.out.print(" ");            }            System.out.print("*");        }        System.out.println();    }}

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