2. 有一个一维数组由键盘输入，据输入的m和n，将其转换为m*n的二维数组。 

package chapter5;import java.util.Scanner;public class demo2 {    public static void main(String[] args) {        int f[]= {1,2,3,4,5,6,7,8,9,10};        Scanner sc=new Scanner(System.in);        System.out.println("请输入m的值");        int m=sc.nextInt();        System.out.println("请输入n的值");        int n=sc.nextInt();        int newf[][]=zhuanhua(f,m,n);        for(int i=0;i