Question

package com.sample;

import java.sql.DriverManager;
import com.mysql.jdbc.Connection;

public class connectionclass {
    public static void main(String args) {
        System.out.println("MySql Connect Example");
        Connection conn = null;
        String url = "jdbc:mysql://localhost:3306/";
        String dbName = "testdatabase";
        String driver = "com.mysql.jdbc.Driver";
        String userName = "root";
        String password = "root";
        try {
            Class.forName(driver).newInstance();
            conn = (Connection) DriverManager.getConnection(url + dbName,
                    userName, password);
            System.out.println("Connected to the database");
            conn.close();
            System.out.println("Disconnected from database");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

此代码连接到数据库，不会出现语法错误。我在Eclipse中这样做，当我运行项目时，它会询问我们需要运行哪个类，但是我的课不在那里。

Answer 1

请更正此行

public static void main(String[] args)

Answer 2

main方法接受String数组的参数所以这样做

public static void main(String args[])

如何运行Java类或调试

2 个答案: