小程序－－－－文字竖排

package day05;
import java.util.*;
/**
 * 实现文字竖排
 * 													<--i  4~0
 * 					0		1		2		3		4  	<--j  0~2
 * 					5		6		7		8		9
 * 					10	11	12	13	14
 *＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊｜｜｜｜－//TT___________||||
 *						i		j
 *						4		0
 *						4		1
 *						4		2
 *						3		0
 *						3		1
 *						3		2
 *						2		0
 *						2		1
 *						2		2
 *							两重循环
 * 			中间代码	a[cols*j+i]=str.charAt(index++);
 *
 */
public class Valign {
	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		String str=scan.next();
		String txt = valign(str, 5);
	System.out.println(txt);
	}
	public static String valign(String str, int size) {
		int rows=size;
		int	cols=str.length()/size;
		if (str.length()%size!=0) {
			cols=cols+1;
		}
		int idx=0;
		char []s = new char[cols*rows];			//行乘列
		for (int i = cols-1; i >=0; i--) {
			for (int j = 0; j <rows; j++) {
				if (idx==str.length()) {				//字符串内容读完了
					s[j*cols+i]='~';
				}else{
					s[j*cols+i]=str.charAt(idx++);	
				}
			}
		}
		System.out.println(Arrays.toString(s));
		//连接结果
		String ss="";										//把每一个字符数组连在字符川上
		for (int i = 0; i < s.length; i++) {
			ss+=s[i];
			if ((i+1)%cols==0) {
				ss+='\n';				//每cols折行
			}
		}
		return ss;
	}
}