剑指offer-02-替换空格

Posted 2021-09-11 咖啡壶子

描述

请实现一个函数，将一个字符串中的每个空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。

示例1

输入：
“We Are Happy”
复制
返回值：
“We%20Are%20Happy”

package day20210826;

public class 替换空格 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s="We Are   Happy";
		String snew=replaceSpace1(s);
		System.out.println(s);
	}
	public static String replaceSpace (String s) {
		char[]array=new char[s.length()*3];
		int index=0;
		for(int i=0;i<s.length();i++) {
			char ch=s.charAt(i);
			if(ch==' ') {
				array[index++]='%';
				array[index++]='2';
				array[index++]='0';
			}else {

				array[index++]=ch;
			}
		}
		String snew=new String(array,0,index);
		return snew;   
    }
    public static String replaceSpace1(String s) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == ' ')
                stringBuilder.append("%20");
            else
                stringBuilder.append(s.charAt(i));
        }
        return stringBuilder.toString();
    }

}