Trouble using xml and XPath

I have been reading allot about it and I have tried different ways but I'm unsure of how to actually read data from xml files using XPath.

I want to store the names of my buttons in xml files, instead of using the current arrays private String[] buttonNameVar = {"Integer", "Float", "Boolean", "Char", "String", "Array", "Byte"}; private String[] buttonNameCon = {"If", "Else", "If Else", "Switch"}; private String[] buttonNameLoop = {"For", "While", "Do ...While"};

Is it possible to get data from the xml files and store it in the arrays?

here is my code:

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.xml.sax.SAXException;

public class ExampleOfButtons extends JPanel{

private JPanel buttonPanelVar, buttonPanelCon, buttonPanelLoop;
private String[] buttonNameVar = {"Integer", "Float", "Boolean", "Char", "String", "Array", "Byte"};
private String[] buttonNameCon = {"If", "Else", "If Else", "Switch"};
private String[] buttonNameLoop = {"For", "While", "Do ...While"};
private String file = "Resources/SettingsFiles/buttonNames.xml";
private File xmlFile;
private Document xmlDoc;
private String result = null;

public ExampleOfButtons() {
    setLayout(new GridLayout(3,1));
    buttonPanelVar = new JPanel();
    buttonPanelCon = new JPanel();
    buttonPanelLoop = new JPanel();
    buttonPanelVar.setLayout(new GridLayout(7,1));
    buttonPanelCon.setLayout(new GridLayout(4,1));
    buttonPanelLoop.setLayout(new GridLayout(3,1));
    buttonPanelVar.setBorder((Border) new TitledBorder(null, "Variables"));
    buttonPanelCon.setBorder((Border) new TitledBorder(null, "Conditions"));
    buttonPanelLoop.setBorder((Border) new TitledBorder(null, "Loop"));
    Color color = new Color(174, 243, 252);
    buttonPanelVar.setBackground(color);
    buttonPanelCon.setBackground(color);
    buttonPanelLoop.setBackground(color);

    xmlFile = new File(file);
    try {
        xmlDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmlFile);
    } catch (SAXException e1) {
        e1.printStackTrace();
    } catch (IOException e1) {
        e1.printStackTrace();
    } catch (ParserConfigurationException e1) {
        e1.printStackTrace();
    }
    xmlDoc.getDocumentElement().normalize();
    XPath x = XPathFactory.newInstance().newXPath();
    XPathExpression ex = x.compile(\buttons\variables);

    addButtOne(buttonPanelVar);
    addButtTwo(buttonPanelCon);
    addButtThree(buttonPanelLoop);

    add(buttonPanelVar);
    add(buttonPanelCon);
    add(buttonPanelLoop);
}

private void addButtThree(JPanel buttonPanelLoop) {
    for (int i = 0; i < buttonNameLoop.length; i++) {
        JButton button = new JButton(buttonNameLoop[i]);
        buttonPanelLoop.add(button);
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                buttonListener(e); 
            }
        });
        addToolTip(button);
    }
}

private void addButtTwo(JPanel buttonPanelTwo) {
    for (int i = 0; i < buttonNameCon.length; i++) {
        JButton button = new JButton(buttonNameCon[i]);
        buttonPanelTwo.add(button);
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                buttonListener(e); 
            }
        });
        addToolTip(button);
    }
}

private void addButtOne(JPanel buttonPanelVar) {
    for (int i = 0; i < buttonNameVar.length; i++) {
        JButton button = new JButton(buttonNameVar[i]);
        buttonPanelVar.add(button);
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                buttonListener(e); 
            }
        });
        addToolTip(button);
    }
}

public void buttonListener(ActionEvent e) {
    String name = e.getActionCommand();
    if(name == "Integer"){
        System.out.println("Integer");
    }
    if(name == "Float"){
        System.out.println("Float");
    }
    if(name == "Boolean"){
        System.out.println("Boolean");
    }
    if(name == "Char"){
        System.out.println("Char");
    }
    if(name == "String"){
        System.out.println("String");
    }
    if(name == "Array"){
        System.out.println("Array");
    }
    if(name == "Byte"){
        System.out.println("Byte");
    }
    if(name == "If"){
        System.out.println("If");
    }
    if(name == "Else"){
        System.out.println("Else");
    }
    if(name == "If Else"){
        System.out.println("If Else");
    }
    if(name == "Switch"){
        System.out.println("Switch");
    }
    if(name == "For"){
        System.out.println("For");
    }
    if(name == "While"){
        System.out.println("While");
    }
    if(name == "Do ...While"){
        System.out.println("Do ...While");
    }
}

public void addToolTip(JButton button){
    button.setToolTipText("Tool Tip");
}

}

After the XPathExpressions I can use something like Node n =(Node)ex.evaluate(xmlDoc, XPathConstants.NODE); results = n.getTextContent(); also here is the xml file I have made

<?xml version="1.0" encoding="UTF-8"?>
<Buttons>
 <variables>
     <var_one>Integer</var_one>
     <var_two>Float</var_two>
     <var_three>Boolean</var_three>
     <var_four>Char</var_four>
     <var_five>String</var_five>
     <var_six>Array</var_six>
     <var_seven>Byte</var_seven>
 </variables>
 <conditions>
     <con_one>If</con_one>
     <con_two>Else</con_two>
     <con_three>If Else</con_three>
     <con_four>Switch</con_four>
 </conditions>
 <loops>
     <loop_one>For</loop_one>
     <loop_two>While</loop_two>
     <loop_three>Do ...While</loop_three>
 </loops>
</Buttons>