编辑代码

public class Iterative {
    public static void printPatternIterative(int n) {
        for (int i = 1; i <= n; i++) {
            StringBuilder line = new StringBuilder();
            for (int j = 0; j < i; j++) {
                line.append(i).append(" ");
            }
            System.out.println(line);
        }
    }

    public static void main(String[] args) {
        printPatternIterative(5);
    }
}