有些什么区别？两种写法.

第一种:import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.*;

public class TestMysqlConnection {
    

    public static void main(String[] args) {
        try {
            

            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        
        
        try {
            Connection conn =
               DriverManager.getConnection("jdbc:mysql://localhost/mydata?" +
                                           "user=root&password=root");
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("select * from dept");
            while(rs.next()){
                System.out.println(rs.getString("deptno"));
            }
            
            

         
        } catch (SQLException ex) {
            
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        }



    }

}
第二种：import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.*;

public class TestMysqlConnection {
    

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver") ;
            conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?"
                    + "user=root&password=root");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select * from dept");
            while (rs.next()) {
                System.out.println(rs.getString("deptno"));
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException ex) {
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        }finally{
            try{
                if(rs != null){
                    rs.close();
                    rs = null;
                }
                if(conn !=null){
                    conn.close();
                    conn = null;
                }
                if(stmt != null){
                    stmt.close();
                    stmt = null;
                }
            }catch(SQLException e1){
                e1.printStackTrace();
            }
        }

    }
}
还有两者换了之后异常都不太一样了？
第二个区别是
设置m = true;
if(ture == m)
和
if(m == true)
有什么区别，为什么说第一种更专业？
----------------解决方案--------------------------------------------------------
设置m = true;
if(ture == m)
和
if(m == true)
有什么区别，为什么说第一种更专业？
你这个里面好像都一样的吧  
什么叫专业 汗,这里也讲专业
----------------解决方案--------------------------------------------------------
try {
            

            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
这段代码用Exception捕捉异常也不专业
----------------解决方案--------------------------------------------------------