數組添加符號輸出

將int a = {{1,2,3},{4,5,6},{7,8,9}}; 輸出爲 “1%2%3#4%5%6#7%8%9”
package com.chinasofti.java.Blog;
public class Input {

public static void main(String[] args) {
    int[][] m={{1,2,3},{4,5,6},{7,8,9}};
    StringBuilder str=new StringBuilder();
    for(int i=0;i<m.length;i++){
        for(int j=0;j<m[i].length;j++){
            str.append(m[i][j]);
            str.append("%");
        }
        str.deleteCharAt(str.length()-1);
        str.append("#");
    }
    str.deleteCharAt(str.length()-1);       
    System.out.println(str);
}

}