import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Box;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class Test extends JApplet implements ActionListener {
private static final long serialVersionUID = 1L;
private JTextField jtfD;
private JTextField jtfU;
private JButton btnUpper;
public void init() {
Container con = this.getContentPane();
jtfD = new JTextField();
jtfU = new JTextField();
btnUpper = new JButton("Upper");
Box b1 = Box.createHorizontalBox();
b1.add(Box.createHorizontalStrut(10));
b1.add(new JLabel("小写"));
b1.add(jtfD);
b1.add(Box.createHorizontalStrut(10));
Box b2 = Box.createHorizontalBox();
b2.add(Box.createHorizontalStrut(10));
b2.add(new JLabel("大写"));
b2.add(jtfU);
b2.add(Box.createHorizontalStrut(10));
Box b3 = Box.createHorizontalBox();
b3.add(Box.createHorizontalStrut(10));
b3.add(btnUpper);
Box b = Box.createVerticalBox();
b.add(Box.createVerticalStrut(30));
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