package jdbc_test;

    import java.sql.*;
    import java.util.Scanner;

    public class JDBC_Test {
        public static void main(String[] args) {

            String tableName=null;
            Scanner input = new Scanner(System.in);
            int id=8;

            System.out.println("Enter the table name: ");
            tableName = input.nextLine();

            try
            {

                Connection con = DriverManager.getConnection(
                        "jdbc:oracle:thin:@localhost:1521:oracle12c", "system", "oracle12c");


                Statement stmt = con.createStatement();


                ResultSet rs = stmt.executeQuery("select * from "+tableName+"where id='"+id+"'");

                System.out.printf("%15s%15s","Name","ID");

                while (rs.next())
                {
                    System.out.printf("n%15s",rs.getString("name"));
                }

                con.close();
                stmt.close();
            }
            catch (Exception e)
            {
                System.out.println(e);
            }
          }
      }

Enter the table name:
t

java.sql.SQLSyntaxErrorException: ORA-00933: SQL command not properly ended

try
{
    Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:oracle12c", username, password);

    // You want to prepare a statement so you can pass parameters.
    PreparedStatement stmt = con.prepareStatement();

    // The first question mark (?)
    // Assuming this is an INT type. If not, there is setString, setLong, etc.
    ps.setInt(1, id);

    // Note the first question mark is where the ID is supposed to be. This is a parameter.
    ResultSet rs = stmt.executeQuery("select * from tableName where id = ?");

    while (rs.next())
    {
        // Replace "column_name" with the name of your column
        System.out.println(rs.getString("column_name"));
    }

    con.close();
    stmt.close();
}