Java小白求助，Java基础题目，恳请各位高手帮忙

[qq_41722962]

题目示例：（不是问题）


欢迎感兴趣的程序大佬在帖子下面留言，将不定期放送Java题目供大佬们挑战

[qybao]

随手写一个吧

public class Test3 {
    public static int[][] createArray(int row) {
        if (row<=0) return null;
        int res[][] = new int[row][];
        for (int i=0; i<row; i++) {
            res[i] = new int[row-i];
            /*
            for (int j=0; j<res[i].length; j++) {
                res[i][j] = 0;
            }
            */
        }
        return res;
    }

    public static void printArray(int[][] a) {
        if (a==null) {
            System.out.println("a is null.");
        }
        for (int i=0; i<a.length; i++) {
            for (int j=0; j<a[i].length; j++) {
                System.out.printf("%d ", a[i][j]);
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int row = 0;
        while (true) {
            try {
                System.out.printf("请输入行数：");
                row = sc.nextInt();
                if (row<=0) throw new Exception("error.");
                break;
            } catch(Throwable e) {
                System.out.println("输入错误，请重输。");
            }
        }
        int[][] a = createArray(row);
        printArray(a);
    }
}

[爱吃鱼的ねこ]

引用 2 楼 qq_41722962的回复:

[quote=引用 1 楼 qybao 的回复:] 随手写一个吧

public class Test3 {
    public static int[][] createArray(int row) {
        if (row<=0) return null;
        int res[][] = new int[row][];
        for (int i=0; i<row; i++) {
            res[i] = new int[row-i];
            /*
            for (int j=0; j<res[i].length; j++) {
                res[i][j] = 0;
            }
            */
        }
        return res;
    }

    public static void printArray(int[][] a) {
        if (a==null) {
            System.out.println("a is null.");
        }
        for (int i=0; i<a.length; i++) {
            for (int j=0; j<a[i].length; j++) {
                System.out.printf("%d ", a[i][j]);
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int row = 0;
        while (true) {
            try {
                System.out.printf("请输入行数：");
                row = sc.nextInt();
                if (row<=0) throw new Exception("error.");
                break;
            } catch(Throwable e) {
                System.out.println("输入错误，请重输。");
            }
        }
        int[][] a = createArray(row);
        printArray(a);
    }
}

强，希望大佬可以持续关注本贴，后续会放送更多题目[/quote] 第一次见到把白嫖说的这么好听的😂