Java 打印三角形

/**
* This class print a triangle with '*'.
* @author Li Jialin
* @version 1.0
*/

import java.util.regex.Pattern;


class MyException extends Exception{
    public MyException(){
        super();
    }    
    public MyException(String message){
        super(message);
    }
}


public class Triangle{

    private int height;  //the height of triangle
    private char[][] array; // used to store the triangle

    public Triangle(int h){
        height = h;
        array = new char[height][2*height-1];
        for(int i=0;i<height;i++){
            for(int j=0;j<2*i+1;j++){
                array[i][j] = '*';    
            }
        }
    }

    public void print(){ // print function
        for(int i=0;i<height;i++){
            for(int k=height-i;k>=0;k--){
                    System.out.print(' ');
            }
            for(int j=0;j<2*i+1;j++){    
                System.out.print(array[i][j]);
            }
            System.out.println();
        }
    }

    public static int get_height(String[]args) throws MyException{
        if (args.length==0){
            throw new MyException("传入的字符串参数不能为null！");
        }
        int height = 0;
        try{
            height = Integer.parseInt(args[0]);  
        }catch(NumberFormatException e){
            System.out.println(e);
            System.exit(-1);
        }
        if (height<=0){
            throw new MyException("高度不能小于1！");
        }
        return height;
    }

    public static void main(String[]args) throws MyException {
        int height = Triangle.get_height(args);
        Triangle t = new Triangle(height);
        t.print();   
    }

}