Java Swing - 如何改变Java程序的单个部分的外观和感觉

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import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.filechooser.FileFilter;
public class Main {
  public static void main(String[] args) throws Exception {
    String[] properties = { "os.name", "java.version", "java.vm.version",
        "java.vendor" };
    for (String property : properties) {
      System.out.println(property + ": " + System.getProperty(property));
    }
    JFileChooser jfc = new JFileChooser();
    jfc.showOpenDialog(null);
    jfc.addChoosableFileFilter(new FileFilter() {
      @Override
      public boolean accept(File f) {
        return f.isDirectory() || f.getName().toLowerCase().endsWith(".obj");
      }
      @Override
      public String getDescription() {
        return "Wavefront OBJ (*.obj)";
      }
      @Override
      public String toString() {
        return getDescription();
      }
    });
 
 
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