【剑指 Offer 05. 替换空格】

 【解题思路】

char字符可以通过char a, a==' '来判断是否是空格。

class Solution {
    public String replaceSpace(String s) {
        char[] cs = s.toCharArray();
        for(int i = 0; i < cs.length; i++)
        {
            if(cs[i] == ' ')
            {
                char[] c = new char[cs.length+2];
                for(int j = 0; j < i; j++)
                {
                    c[j] = cs[j];
                }
                c[i] = '%';
                c[i+1] = '2';
                c[i+2] = '0';
                for(int j = i+1; j< cs.length; j++)
                {
                    c[j+2] = cs[j];
                }
                s = String.valueOf(c);
                cs = s.toCharArray();
            }
        }
        return s;
    }
}