第4题
注意:请勿修改main()主方法和其他已有语句内容,仅在横线处填入适当语句。
import java.awt.*;
import java.awt.event.*;
public class simple extends Frame
{
public static void main(String[] args)
{
simple frame=new simple("simple");
frame.init();
frame.setSize(300,300);
frame.show();
}
public simple(String name)
{
super(name);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{______;
}
} );
}
public void init()
{
setLayout(new______);
Label labelTitle=new Label("在本文框中输入字符串, 可以早Frame中间显示");
Label showTextLabel=new Label();
TextField textField=new TextField("请在这里输入字符串");
textField.addActionListener(new AddStringListener(showTextLabel,
textField));
add("North", labelTitle);
add("Center", showTextLabel);
add("South", textField);
}
}
class AddStringListener implements ActionListener
{
Label label;
TextField textField;
public AddStringListener(Label label, TextField textField)
{
this.label=label;
this.textField=textField;
}
public void actionperformed(ActionEvent e)
{
label.setText(textField.getText());
}
}
第5题
注意:不改动程序的结构,不得增行或减行。
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code=SimpleHitMouse.java width=800 height=400>
</applet>
*/
public class SimpleHitMouse implements Applet{
private java.util.Vector points=new java.util.Vector();
public void init(){
adclMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent e){
points.add(new Point (e.getX() ,e.getY()));
paint ( );
}
});
}
public void update(Graphics g){
repaint(g);
}
public void paint(Graphics g){
for(int i=0;i<points.size();i++){
Point dot=(Point)points.elementAt(i);
g.drawString("x",dot.x,dot.y);
}
}
public static void main(String args[ ]){
Frame. fram=new Frame("CelayTree");
SimpleHitMouse dot=new SimpleHitMouse();
dot.init();
dot.start();
fram.add("Center",dot);
fram.setSize(400,300);
fram.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{System.exit(0);}
});
fram.show();
}
}
ex32_3.html:
<html>
<head>
<title>A Simple Program</title>
</head>
<body>
<applet code="SimpleHitMouse.class" width=800 height=400>
</applet>
</body>
</html>
第8题
A.无论是以何种形式作出都必须要有对价才能有效
B.简式合同必须要有对价才能有效
C.签字蜡封合同必须要有对价才能有效
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