要求:设计一个用JApplet小应用程序编写的图形用户界面,在界面的窗口中显示一张图片,一个按钮,当按下该按钮后,显示另外一张图片。
请部按下按钮显示一张图片?未完成代码如下:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class Shiyan14A extends JApplet {
Image soldier,soldier2;
JButton b1,b2;
public void init(){
soldier =getImage(getCodeBase(),"1.jpg");
b1=new JButton("下一张");b1.setSize(5,5);
b2=new JButton("上一张");b2.setSize(5,5);
setLayout(new FlowLayout(FlowLayout.CENTER));
add(b1);add(b2);
b1.setVerticalTextPosition(JButton.BOTTOM);
b2.setVerticalTextPosition(JButton.TOP);
}
public void paint(Graphics g){
g.drawImage(soldier,0,0,640,480,this);
b1.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
//getContentPane().add(soldier);
}
public void panitt(Graphics g){
g.drawImage(soldier2,0,0,640,480,null);
}
});
}
}
请部按下按钮显示一张图片?未完成代码如下:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class Shiyan14A extends JApplet {
Image soldier,soldier2;
JButton b1,b2;
public void init(){
soldier =getImage(getCodeBase(),"1.jpg");
b1=new JButton("下一张");b1.setSize(5,5);
b2=new JButton("上一张");b2.setSize(5,5);
setLayout(new FlowLayout(FlowLayout.CENTER));
add(b1);add(b2);
b1.setVerticalTextPosition(JButton.BOTTOM);
b2.setVerticalTextPosition(JButton.TOP);
}
public void paint(Graphics g){
g.drawImage(soldier,0,0,640,480,this);
b1.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
//getContentPane().add(soldier);
}
public void panitt(Graphics g){
g.drawImage(soldier2,0,0,640,480,null);
}
});
}
}
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
public class Shiyan14A extends JApplet {
Image soldier,soldier2;
JLabel l;
JButton b1;//,b2;
public void init(){
soldier =getImage(getCodeBase(),".\\1.jpg");
soldier2 =getImage(getCodeBase(),".\\wa2.jpg");
Icon i=new ImageIcon(".\\1.jpg");
l=new JLabel(i);add(l);
b1=new JButton("下一张");b1.setSize(5,5);
// b2=new JButton("上一张");b2.setSize(5,5);
setLayout(new FlowLayout());
add(b1);//add(b2);
// b1.setVerticalAlignment(JButton.BOTTOM);
//b2.setVerticalAlignment(JButton.TOP);
b1.setVisible(true);//b2.setVisible(true);
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
boolean flag=true;
b1.setVerticalAlignment(JButton.BOTTOM);
//b2.setVerticalAlignment(JButton.TOP);
if(flag){
Icon a=new ImageIcon(".\\1.jpg");
b1.setIcon(a);
flag=false;
//b2.setEnabled(true);
}
else{
Icon c=new ImageIcon(".\\wa2.jpg");
b1.setIcon(c);
flag=true;
}
}
});
/*b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//b1.setVerticalAlignment(JButton.BOTTOM);
//b2.setVerticalAlignment(JButton.TOP);
if(!flag){
Icon a=(Icon)soldier2;
b2.setIcon(a);
flag=true;
repaint();
}
}
});*/
}
}