Java JDBC Update Table

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import java.sql.*;

public class JavaJDBCUpdatTable {

	public static void main(String[] args) {
		try {
			Class.forName("org.apache.derby.jdbc.ClientDriver");
		} catch (ClassNotFoundException e) {
			System.out.println("Class not found " + e);
		}
		try {
			Connection con = DriverManager.
					getConnection("jdbc:derby://localhost:1527/testDb", "username", "password");
			Statement stmt = con.createStatement();
			String query1 = "update emp set name='ravi' where id=2";
			String query2 = "delete  from emp where id=1";
			String query3 = "insert into emp values (1,'ronak','manager')";
			stmt.execute(query1);
			stmt.execute(query2);
			stmt.execute(query3);
			ResultSet rs = stmt.executeQuery("SELECT * FROM emp");
			System.out.println("id  name    job");
			while (rs.next()) {
				int id = rs.getInt("id");
				String name = rs.getString("name");
				String job = rs.getString("job");
				System.out.println(id + "   " + name + "    " + job);
			}
		} catch (SQLException e) {
			System.out.println("SQL exception occured" + e);
		}
	}
}
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