嵌套循环

public class day_4_2 {
    public static void main(String[] args) {
        /*循环嵌套*/
        /*
         ****
         ****
         ****
         ****
         */
        for (int i = 1; i <= 4; i++) {
            for (int j = 1; j <= 4; j++) {
                System.out.print("*");
            }
            System.out.println("");
        }
        /*
         *
         **
         ***
         ****
         */
        for (int i = 1; i <= 4; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}