问答题

程序如下：
∥Java_3. html
import java. awt. * ;
import .java. awt. event. * ;
∥********** Found **********
public class Java_3 (5) AetionListener

public static void main(String args[ ])

Java_3 tb=new Java_3( );
Frame f=new Frame( "Button Test");
f. setSize ( 200,100 );
f. setLayout( new FlowLayout( FlowLayout. CENTER));
Button b = new Button("Press the Button!");
∥********** Found **********
b. (6) (tb);
f. add(b);
f. setVisible(true);

public void actionPerformed(ActionEvent e)

Frame fr=new Frame("An Other");
fr. setBackground( Color. green);
fr. add(new Label("This frame shows when "+"ressing the button in Button Test"));
fr. pack( );
fr. setVisible(true);