📄 buttongroupsframe.html

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<html><head><title>Display page for ButtonGroups at www.BruceEckel.com</title></head>
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<FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>ButtonGroups.java</H2><hr></FONT>
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<FONT SIZE="+3"><PRE><B>
//: c14:ButtonGroups.java
// Uses reflection to create groups
// of different types of AbstractButton.
// &lt;applet code=ButtonGroups width=500 height=300&gt;&lt;/applet&gt;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.lang.reflect.*;
import com.bruceeckel.swing.*;

public class ButtonGroups extends JApplet {
  private static String[] ids = {
    "June", "Ward", "Beaver",
    "Wally", "Eddie", "Lumpy",
  };
  static JPanel makeBPanel(Class klass, String[] ids) {
    ButtonGroup bg = new ButtonGroup();
    JPanel jp = new JPanel();
    String title = klass.getName();
    title = title.substring(title.lastIndexOf('.') + 1);
    jp.setBorder(new TitledBorder(title));
    for(int i = 0; i &lt; ids.length; i++) {
      AbstractButton ab = new JButton("failed");
      try {
        // Get the dynamic constructor method
        // that takes a String argument:
        Constructor ctor =
          klass.getConstructor(new Class[]{String.class});
        // Create a new object:
        ab = (AbstractButton)
          ctor.newInstance(new Object[] { ids[i] });
      } catch(Exception ex) {
        System.err.println("can't create " + klass);
      }
      bg.add(ab);
      jp.add(ab);
    }
    return jp;
  }
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(makeBPanel(JButton.class, ids));
    cp.add(makeBPanel(JToggleButton.class, ids));
    cp.add(makeBPanel(JCheckBox.class, ids));
    cp.add(makeBPanel(JRadioButton.class, ids));
  }
  public static void main(String[] args) {
    Console.run(new ButtonGroups(), 500, 300);
  }
} ///:~
</B></PRE></FONT>
</html>
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