编辑代码

public class QuestionFour {
    public static void main(String[] args) {
        System.out.println("use iteration:");
        useIterationOutput(6);
        System.out.println("use recursion");
        useRecursionOutput(6);
    }
    public static void useRecursionOutput(int n){
        if (n == 1){
            System.out.println(n);
            return;
        }
        useRecursionOutput(n-1);
        for (int i = 0; i < n; i++){
            System.out.print(n + " ");
        }
        System.out.println();

    }
    public static void useIterationOutput(int n){
        for (int i = 1 ; i <= n; i++){
            for(int j = 1; j <= i ; j++){
                System.out.print(i + " ");
            }
            System.out.println();
        }
    }
}