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Java Source | 2000-05-25 | 6.7 KB | 206 lines |
- //: DisplayMethods.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Display the methods of any class inside
- // a window. Dynamically narrows your search.
- import java.awt.*;
- import java.awt.event.*;
- import java.applet.*;
- import java.lang.reflect.*;
- import java.io.*;
-
- public class DisplayMethods extends Applet {
- Class cl;
- Method[] m;
- Constructor[] ctor;
- String[] n = new String[0];
- TextField
- name = new TextField(40),
- searchFor = new TextField(30);
- Checkbox strip =
- new Checkbox("Strip Qualifiers");
- TextArea results = new TextArea(40, 65);
- public void init() {
- strip.setState(true);
- name.addTextListener(new NameL());
- searchFor.addTextListener(new SearchForL());
- strip.addItemListener(new StripL());
- Panel
- top = new Panel(),
- lower = new Panel(),
- p = new Panel();
- top.add(new Label("Qualified class name:"));
- top.add(name);
- lower.add(
- new Label("String to search for:"));
- lower.add(searchFor);
- lower.add(strip);
- p.setLayout(new BorderLayout());
- p.add(top, BorderLayout.NORTH);
- p.add(lower, BorderLayout.SOUTH);
- setLayout(new BorderLayout());
- add(p, BorderLayout.NORTH);
- add(results, BorderLayout.CENTER);
- }
- class NameL implements TextListener {
- public void textValueChanged(TextEvent e) {
- String nm = name.getText().trim();
- if(nm.length() == 0) {
- results.setText("No match");
- n = new String[0];
- return;
- }
- try {
- cl = Class.forName(nm);
- } catch (ClassNotFoundException ex) {
- results.setText("No match");
- return;
- }
- m = cl.getMethods();
- ctor = cl.getConstructors();
- // Convert to an array of Strings:
- n = new String[m.length + ctor.length];
- for(int i = 0; i < m.length; i++)
- n[i] = m[i].toString();
- for(int i = 0; i < ctor.length; i++)
- n[i + m.length] = ctor[i].toString();
- reDisplay();
- }
- }
- void reDisplay() {
- // Create the result set:
- String[] rs = new String[n.length];
- String find = searchFor.getText();
- int j = 0;
- // Select from the list if find exists:
- for (int i = 0; i < n.length; i++) {
- if(find == null)
- rs[j++] = n[i];
- else if(n[i].indexOf(find) != -1)
- rs[j++] = n[i];
- }
- results.setText("");
- if(strip.getState() == true)
- for (int i = 0; i < j; i++)
- results.append(
- StripQualifiers.strip(rs[i]) + "\n");
- else // Leave qualifiers on
- for (int i = 0; i < j; i++)
- results.append(rs[i] + "\n");
- }
- class StripL implements ItemListener {
- public void itemStateChanged(ItemEvent e) {
- reDisplay();
- }
- }
- class SearchForL implements TextListener {
- public void textValueChanged(TextEvent e) {
- reDisplay();
- }
- }
- public static void main(String[] args) {
- DisplayMethods applet = new DisplayMethods();
- Frame aFrame = new Frame("Display Methods");
- aFrame.addWindowListener(
- new WindowAdapter() {
- public void windowClosing(WindowEvent e) {
- System.exit(0);
- }
- });
- aFrame.add(applet, BorderLayout.CENTER);
- aFrame.setSize(500,750);
- applet.init();
- applet.start();
- aFrame.setVisible(true);
- }
- }
-
- class StripQualifiers {
- private StreamTokenizer st;
- public StripQualifiers(String qualified) {
- st = new StreamTokenizer(
- new StringReader(qualified));
- st.ordinaryChar(' ');
- }
- public String getNext() {
- String s = null;
- try {
- if(st.nextToken() !=
- StreamTokenizer.TT_EOF) {
- switch(st.ttype) {
- case StreamTokenizer.TT_EOL:
- s = null;
- break;
- case StreamTokenizer.TT_NUMBER:
- s = Double.toString(st.nval);
- break;
- case StreamTokenizer.TT_WORD:
- s = new String(st.sval);
- break;
- default: // single character in ttype
- s = String.valueOf((char)st.ttype);
- }
- }
- } catch(IOException e) {
- System.out.println(e);
- }
- return s;
- }
- public static String strip(String qualified) {
- StripQualifiers sq =
- new StripQualifiers(qualified);
- String s = "", si;
- while((si = sq.getNext()) != null) {
- int lastDot = si.lastIndexOf('.');
- if(lastDot != -1)
- si = si.substring(lastDot + 1);
- s += si;
- }
- return s;
- }
- } ///:~