乘法表改进

package crk;import javax.swing.JOptionPane;public class Crk {/** * @param args */public boolean isNum(String str) {for (int i =0;i<str.length();i++) {int chr = str.charAt(i); if ((chr >='0' && chr<= '9')||chr=='-')return true;}return false;}public String shuru(String text, String title, int i) {String inputWord = "";while (!isNum(inputWord)) {inputWord = JOptionPane.showInputDialog(null, text, title, i);if (inputWord == null) {System.exit(0);}}return inputWord;}public void mimi(){ String h= this.shuru("您想打印的行数","请输入数字：",1); int hang = Integer.parseInt(h); int[][] a= new int[hang][hang]; for(int i=0;i<=hang;i++){ for(int j=0;j<=i;j++){ a[i][j] = (j+1)*(i+1); dayin(a);}}} public void dayin(int[][] x){for(int i=0;i<=x.length;i++){ for(int j=0;j<=i;j++){ x[i][j] = (j+1)*(i+1); System.out.print((j+1)+"*"+(i+1)+"="+x[i][j]+" "); } System.out.println(); } } public static void main(String[] args) {// TODO Auto-generated method stubCrk pupu=new Crk(); pupu.mimi(); }}