GetContentPane function shows error

Question

The following program shows cannot resolve symbol at the getContentPane() function. CAn anybody tell me why this is happening
import javax.swing.*;
import java.io.*;
class Test extends JFrame
final String[] colhead = {"No","Name"};
final Object[][] data = new Object[10][2];
JTable table = null;
JFrame frame = null;
public Test()
super("Table");
data[0][0] = "1";
data[0][1] = "Sanil";
data[1][0] = "2";
data[1][1] = "Kenney";
frame = new JFrame();
table = new JTable(data,colhead);
Container content = frame.getContentPane();
content.setLayout(null);
}

Answer 1

What package does Container belong to? Did you import the correct package?