buttongroups.java

think in java TIJ-3rd-edition-code.zip

//: c13:ButtonGroups.java
// Uses reflection to create groups 
// of different types of AbstractButton.
// <applet code=ButtonGroups
//  width=500 height=300></applet>
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 {
  static String[] ids = { 
    "June", "Ward", "Beaver", 
    "Wally", "Eddie", "Lumpy",
  };
  static JPanel 
  makeBPanel(Class bClass, String[] ids) {
    ButtonGroup bg = new ButtonGroup();
    JPanel jp = new JPanel();
    String title = bClass.getName();
    title = title.substring(
      title.lastIndexOf('.') + 1);
    jp.setBorder(new TitledBorder(title));
    for(int i = 0; i < ids.length; i++) {
      AbstractButton ab = new JButton("failed");
      try {
        // Get the dynamic constructor method
        // that takes a String argument:
        Constructor ctor = bClass.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 " + 
          bClass);
      }
      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);
  }
} ///:~