jfilefilter.java

Java 图形界面入门实例

import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;


public class JFileFilter extends javax.swing.filechooser.FileFilter {
  protected String description;

  protected ArrayList exts = new ArrayList();

  public void addType(String s) {
    exts.add(s);
  }

  /** Return true if the given file is accepted by this filter. */
  public boolean accept(File f) {
    // Little trick: if you don't do this, only directory names
    // ending in one of the extentions appear in the window.
    if (f.isDirectory()) {
      return true;

    } else if (f.isFile()) {
      Iterator it = exts.iterator();
      while (it.hasNext()) {
        if (f.getName().endsWith((String) it.next()))
          return true;
      }
    }

    // A file that didn't match, or a weirdo (e.g. UNIX device file?).
    return false;
  }

  /** Set the printable description of this filter. */
  public void setDescription(String s) {
    description = s;
  }

  /** Return the printable description of this filter. */
  public String getDescription() {
    return description;
  }
}