Write a program to construct a triangle with the ?*?

Here is the code of the program:

import java.io.*;

class triangle{
public static void main(String[] args) {
  try{
    BufferedReader object = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("enter the number");
    int a= Integer.parseInt(object.readLine());
    for (int i=1; i<a;i++ ){
      for (int j=1; j<=i;j++ ){
        System.out.print("*");
      }
      System.out.println("");
    }
  }
  catch(Exception e){}
}
}

Download the program.