Find the beginning / the end of the word appearing in the text.
I feel really stupid for asking this, but my brain doesn't seem to work at the moment and I can't find my old semester 1 examples.While I can easily solve this C++ by trying to do it in Java is somewhat of a mystery. size_t found =, str.find (string::npos-> etc.)
Basically, I'm implementing a default highlighter. The words that I must seek as much as I KNOW appear only once in the Document or not at all.
Query SQL, SELECT, FROM, WHERE, etc.
I'm going to offshore an example I found here: [http://www.java2s.com/Code/Java/Swing-JFC/Anexampleofhighlightingmultiplediscontiguousregionsofatextcomponent.htm]
Who seeks the vowels in a document and highlights. So I thought it would be a simple switch so he could do what I wanted, but I've been plugging away at him for a few hours now and can not solve.
Would be much easier if String.contains (CharSequence cs) gave something more useful back a... whole Boolean value would be well :(
Sample is below anyway, to make it simple, I have a simple query in the text pane and only looking for the 3 words, select where.
Can someone tell me how would I say the method addHighlight() of the word found less?
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
public class MultiHighlight implements ActionListener
{
private JTextComponent comp;
private String[] wordsToHighlight;
public MultiHighlight(JTextComponent c, String[] words)
{
comp = c;
wordsToHighlight = words;
}
public void actionPerformed(ActionEvent e)
{
// highlight
Highlighter h = comp.getHighlighter();
h.removeAllHighlights();
String text = comp.getText().toUpperCase();
for (int i=0;i<wordsToHighlight.length;i++)
{
if (text.contains(wordsToHighlight))
{
// find start, find end... ?
h.addHighlight(start, end, DefaultHighlighter.DefaultPainter)
}
}
}
public static void main(String args[])
{
JFrame frame = new JFrame("MultiHighlight");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextArea area = new JTextArea(5, 20);
area.setText("Select *\nFrom stuff s, more m\nWhere s.otherstuff = m.otherstuff.");
frame.getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
JButton b = new JButton("Highlight All SQL words");
String[] wordsToLookFor = { "SELECT", "FROM", "WHERE" };
b.addActionListener(new MultiHighlight(area, wordsToLookFor));
frame.getContentPane().add(b, BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
}
}
int start = text.indexOf(wordsToHighlight); int end = start + wordsToHighlight[i].length(); try { h.addHighlight(start, end, DefaultHighlighter.DefaultPainter); } catch (BadLocationException e1) { e1.printStackTrace(); }
Tags: Java
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