C:如何将%20转换为空格？

var encodedString = "%20%20%E5%A6%82%E4%BD%95%E5%B0%86%20%20%E8%BD%AC%E6%8D%A2%E4%B8%BA%E7%A9%BA%E6%A0%BC%EF%BC%9F";
var decodedString = decodeURIComponent(encodedString);
console.log(decodedString);

import java.net.URLDecoder;

public class Main {
    public static void main(String[] args) throws Exception {
        String encodedString = "%20%20%E5%A6%82%E4%BD%95%E5%B0%86%20%20%E8%BD%AC%E6%8D%A2%E4%B8%BA%E7%A9%BA%E6%A0%BC%EF%BC%9F";
        String decodedString = URLDecoder.decode(encodedString, "UTF-8");
        System.out.println(decodedString);
    }
}