how to make sure that my connection to database works?

how to make sure that the connection string to my orical data base is correct.
this is my conection code in java

 // Database Connection object
    Connection conn = null;
    // Set database URL details.
    String url = "jdbc:oracle:thin:@localhost:1521:orcl";
    try {
      // Instantiate the driver class.
      // Get the database connection.
      conn = DriverManager.getConnection(url,"system","pass");
    }catch (Exception ex) {
        System.out.println("Exception while getting database connection: "
                           +ex.toString() );

can any one help me to write a select statment to make sure that it goes to my database???

I have this table created:
SQL> CREATE TABLE product_information(PRODUCT_ID           NUMBER(6)      NOT NULL,                                      PRODUCT_NAME         VARCHAR2(50)   NOT NULL,                                      PRODUCT_DESCRIPTION  VARCHAR2(2000) NOT NULL,                                       MIN_PRICE            NUMBER(8,2),                                      LIST_PRICE           NUMBER(8,2));SQL> INSERT INTO product_information VALUES(2400, 'DIMM - 512 MB',         '512 MB DIMM memory. Improved memory upgrade granularity', 380, 448);SQL> INSERT INTO product_information VALUES(2401, 'DIMM - 64MB',        'Memory DIMM: RAM, 64MB (100-MHz Unregistered ECC SDRAM)', 202, 247);SQL> INSERT INTO product_information VALUES(2402, 'EDO - 32MB',        'Memory EDO SIM: RAM, 32 MB (100-MHz Unregistered ECC SDRAM)', 149, 179);
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JaaxConnect With a Mentor Commented:
You could code like this after securing the connection
conn = DriverManager.getConnection(url,"system","pass");
PreparedStatement prep = conn.prepareStatement("select * from product_information");
ResultSet rs = prep.executeQuery();
//Iteratore over the resultset

prep = conn.prepareStatement("select sysdate from dual");
rs = prep.executeQuery();
      System.out.println("Date : "+rs.getDate("sysdate"));


OR querying to dual to check DB connection

PreparedStatement prep = conn.prepareStatement("select sysdate from dual");
ResultSet rs = prep.executeQuery();
      System.out.println("Date : "+rs.getDate("sysdate"));


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