小编rmc*_*cmk的帖子

我已经在这方面工作了将近一天半,我似乎无法解决这个错误.我不知道为什么要关闭ResultSet.也许你们中的一些人可以帮助我.

MySQLDatabase:

package net.gielinor.network.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public abstract class MySQLDatabase {

    private String host;
    private String database;
    private String username;
    private String password;
    private Connection connection = null;
    private Statement statement;

    public MySQLDatabase(String host, String database, String username, String password) {
        this.host = host;
        this.database = database;
        this.username = username;
        this.password = password;
    }

    public abstract void cycle() throws SQLException;

    public abstract void ping();

    public void connect() {
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            connection …

我试图破解Java中的哈希算法:

    public static int encode(String file) {
            int hash = 0;
            file = file.toUpperCase();

            for(int i = 0; i < file.length(); i++) {
                    hash = (hash * 61 + file.charAt(i)) - 32;
            }
            return hash;
    }

这是我的尝试:

public static String decode(int hash) {
            long realHash = (hash < 0 ? Integer.MAX_VALUE + Math.abs(hash) : hash);
            ByteBuffer buffer = ByteBuffer.allocate(50);

            while (realHash > 0) {
                    buffer.put((byte) ((realHash % 61) + 32));
                    realHash = (realHash - 32) / 61;
            }
            buffer.flip();
            return …