字符串替换

public static String replaceSpace(String input){
        char[] inputs = input.toCharArray();
        char[] containers = new char[100];
        int originLength = inputs.length;
        int spaceLength = 0;
        int i = 0;

        while(i < originLength) {
            if(' ' == inputs[i]) {
                spaceLength ++;
            }
            containers[i] = inputs[i];
            i ++;
        }
        int changedLength = originLength + spaceLength * 2;
        int outputLength = originLength + spaceLength * 2;
        while(originLength > 0 && originLength < changedLength) {
            if(containers[originLength - 1] == ' '){
                containers[-- changedLength] = '+';
                containers[-- changedLength] = '+';
                containers[-- changedLength] = '+';
            } else {
                containers[--changedLength] = containers[originLength - 1];
            }
            originLength --;
        }
        String result = "";
        int j = 0;
        while (outputLength > 0) {
            String index = String.valueOf(containers[j]);
            result = result.concat(index);
            outputLength --;
            j++;
        }
        return result;
    }