JAvaプログラミング--文字列、長さ、分割文字列を指定します.

package com.henu;

import java.util.Arrays;

public class Demo01 {
    public static void main(String[] args) {
        String str = "abcdefg";
        int chars = 2;
        String[] res = split(str,chars);
        System.out.println(Arrays.toString(res));
    }
    public static String[] split(String str,int chars){
        int len = str.length();
        String[] res = null;
        if (len % 2 == 0){
            res = new String[len/chars];
        }else{
            res = new String[len/chars+1];
        }
        String mid = "";
        int k = 0;
        for (int i = 0; i < str.length(); i+=chars) {
            if (i + chars < str.length()){
                mid = str.substring(i,i+chars);
            }else{
                mid = str.substring(i);
            }
            if (k < res.length) {
                res[k++] = mid;
            }
        }
        return res;
    }
}

package com.henu;

import java.util.Arrays;

public class Demo02 {
    public static void main(String[] args) {
        String str = "abcdefg";
        int chars = 3;
        String[] res = split(str,chars);
        System.out.println(Arrays.toString(res));
    }
    public static String[] split(String str,int chars){
        int n = (str.length()+ chars - 1)/chars;
        String ret[] = new String[n];
        for(int i=0; i