How to get primary key value (auto-generated keys) from inserted queries using JDBC

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

public class MyAutoGeneratedKeys {

    public static void main(String a[]){
        
        Connection con = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            con = DriverManager.
                getConnection("jdbc:oracle:thin:@<hostname>:<port num>:<DB name>"
                    ,"user","password");
            String query = "insert into emps (name, dept, salary) values (?,?,?)";
            pstmt = con.prepareStatement(query,Statement.RETURN_GENERATED_KEYS);
            pstmt.setString(1, "John");
            pstmt.setString(2, "Acc Dept");
            pstmt.setInt(3, 10000);
            pstmt.executeUpdate();
            rs = pstmt.getGeneratedKeys();
            if(rs != null && rs.next()){
                System.out.println("Generated Emp Id: "+rs.getInt(1));
            }

        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally{
            try{
                if(rs != null) rs.close();
                if(pstmt != null) pstmt.close();
                if(con != null) con.close();
            } catch(Exception ex){}
        }
    }