java控制台怎么输出这个？

import java.util.Scanner;
public class Test {
public static void main(String[] args) {
System.out.println("请输入一个正整数：");
Scanner scanner=new Scanner(System.in);
int num=0;
try
{
num=Integer.parseInt(scanner.nextLine());
}
catch(Exception ex)
{
num=0;
System.out.println("输入的不正确，请核实");
}
if(num!=0)
{
for (int i = 1; i <= num; i++) {
for (int j = 1; j <= num - i; j++)// 打印每行的空格
{
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) // 打印每行的*
{
System.out.print("*");
}
System.out.println();
}
}
}
}