I'm trying to use the JScrollPane component in Java - jscrollpane

Question

Hi guys i would like you to help me display parallel arrays on a JScrollPane. The arrays are of String and double data types. Here is my sample code: String[] items = {"fish","frog"}; double[] prices = {12,19}; I'm supposed to put them on the JScrollPane, with the element in position 0 of the items array next to the prices position 0 and so on;

Answer 1

Any reason you can't put your data in JTable and add the table to the scroll pane?
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
class ItemTableModel extends AbstractTableModel {
final String[] items;
final double[] prices;
public ItemTableModel(String[] items, double[] prices) {
checkNotNull(items);
checkNotNull(prices);
checkArgument(items.length == prices.length);
this.items = items;
this.prices = prices;
}
#Override
public int getRowCount() {
return items.length;
}
#Override
public int getColumnCount() {
return 2;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
switch (columnIndex) {
case 0:
return items[rowIndex];
case 1:
return prices[rowIndex];
default:
throw new IllegalArgumentException();
}
}
#Override
public Class<?> getColumnClass(int columnIndex) {
switch (columnIndex) {
case 0:
return String.class;
case 1:
return Object.class;
default:
throw new IllegalArgumentException();
}
}
#Override
public String getColumnName(int columnIndex) {
switch (columnIndex) {
case 0:
return "Item";
case 1:
return "Price";
default:
throw new IllegalArgumentException();
}
}
}
public class Example {
public static void main(String[] args) {
Runnable createAndShowGui = new Runnable() {
#Override
public void run() {
createAndShowGui();
}
};
SwingUtilities.invokeLater(createAndShowGui);
}
private static void createAndShowGui() {
String[] items = { "fish", "frog" };
double[] prices = { 12, 19 };
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
ItemTableModel tableModel = new ItemTableModel(items, prices);
JTable table = new JTable(tableModel);
//table.setTableHeader(null); // uncomment to hide the table header
frame.setContentPane(new JScrollPane(table));
frame.pack();
frame.setVisible(true);
}
}