替换空格

替换空格

public class ReplaceSpace {
    public static void main(String[] args) {
        String string = "We are happy.";
        char[] chars = string.toCharArray();
        int count = 0; // 用于记录空格数
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] == ' '){
                count++;
            }
        }
        char[] replaceChar = new char[chars.length + 2*count];
        int index = chars.length - 1;
        int replaceIndex = replaceChar.length - 1;
        while(true){
            if (index < 0 && replaceIndex < 0){
                break;
            }
            if (chars[index] != ' '){
                replaceChar[replaceIndex] = chars[index];
                index--;
                replaceIndex--;
            }else if (chars[index] == ' '){
                index--;
                replaceChar[replaceIndex] = '0';
                replaceChar[replaceIndex-1] = '2';
                replaceChar[replaceIndex-2] = '%';
                replaceIndex -= 3;
            }
        }
        String result = "";
        for (int i = 0; i < replaceChar.length; i++) {
            result += replaceChar[i];
        }
        System.out.println(result);
    }
}