在多线程应用程序中，单独连接还是共享数据库连接？

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DatabaseUtil {
    private static HikariDataSource dataSource;

    static {
        HikariConfig config = new HikariConfig();
        config.setJdbcUrl("jdbc:mysql://localhost:3306/mydb");
        config.setUsername("user");
        config.setPassword("password");
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "250");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");

        dataSource = new HikariDataSource(config);
    }

    public static Connection getConnection() throws SQLException {
        return dataSource.getConnection();
    }

    public static void close(Connection conn, PreparedStatement ps, ResultSet rs) {
        try {
            if (rs != null) rs.close();
            if (ps != null) ps.close();
            if (conn != null) conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;

        try {
            conn = getConnection();
            ps = conn.prepareStatement("SELECT * FROM users WHERE id = ?");
            ps.setInt(1, 1);
            rs = ps.executeQuery();

            while (rs.next()) {
                System.out.println(rs.getString("name"));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            close(conn, ps, rs);
        }
    }
}