java 数组

1.数组的长度

import java.util.*;

publicclass hello { publicstaticvoid main(String[] args)
{ int [][]day = newint[10][]; 
for(int i = 0;i < 10; i++) 
day[i] = newint [12]; 
System.out.println(day.length); 
System.out.println(day[0].length); } }

10　　
12