编辑代码

//package com.software;
import java.util.Scanner;
public class Demo {
    public static void  main(String[]args) {
        Scanner input = new Scanner(System.in);
        int myPut = input.nextInt();
        int i,j,k;
        if (myPut<0){
            System.out.println("输入非法")；
        }
        else{
        for ( i = 0; i <myPut; i++) {
            for ( j = 0; j < i; j++) {
                System.out.print(" ");
            }
            for ( k=0; k < 2 * (myPut-i) -1; k++) {
                System.out.print("*");
            }
            System.out.println();
            }
        }
    }
}