温度转换器Java程序

package ex1; import java.applet.AudioClip; import java.awt.BorderLayout; import java.awt.Button; import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Image; import java.awt.Panel; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ImageIcon; import javax.swing.JApplet; import javax.swing.JComboBox; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.JLabel; @SuppressWarnings("serial") public class J_WenDu extends JApplet implements ActionListener { public JTextField first,three; public JComboBox chose; public Button ecquilButton,starButton,stopButton; public Panel Imagepanel; public JPanel lastpanel; AudioClip music; //小应用程序启动时先调用此函数，完成界面设计 public void init() { resize(800,600); Container c=getContentPane(); c.setLayout(new BorderLayout());//小应用程序内容窗格设为边界布局 lastpanel=new JPanel(); lastpanel.setLayout(new GridLayout(1,4));//南部的面板设为网格布局 first=new JTextField(10); three=new JTextField(10); String[]tybe={"转换为摄氏温度","转换为华氏温度"}; chose=new JComboBox(tybe); ecquilButton=new Button("="); ecquilButton.addActionListener(this); lastpanel.add(first); lastpanel.add(chose); lastpanel.add(ecquilButton); lastpanel.add(three); c.add(lastpanel,BorderLayout.SOUTH); stopButton=new Button("停止音乐"); starButton=new Button("开始音乐"); stopButton.addActionListener(this);//给按钮注册事件监听器 starButton.addActionListener(this); Imagepanel=new Panel();//放图片的面板 Panel buttonPanel=new Panel();//放音乐播放和停止按钮的面板 ImageIcon at=new ImageIcon("温度.jpg"); Image image=at.getImage(); JLabel label=new JLabel(new ImageIcon(image.getScaledInstance(800,700,Image.SCALE_REPLICATE))); label.setPreferredSize(new Dimension(800,700)); Imagepanel.add(label); buttonPanel.add(stopButton); buttonPanel.add(starButton); c.add(Imagepanel,BorderLayout.CENTER); c.add(buttonPanel,BorderLayout.NORTH); music=getAudioClip(getCodeBase(),"好听的音乐.wav"); music.loop(); } //有事件发生时调用此函数 public void actionPerformed(ActionEvent e) { Button source=(Button) e.getSource();//获取最初的事件源 String whice=source.getLabel(); if(whice.contentEquals("=")) { String heat=first.getText(); Double a=Double.parseDouble(heat); String select=(String)chose.getSelectedItem(); chose.setEnabled(true); if(select.contentEquals("转换为摄氏温度")) { a=(a-32)/1.8; paint(a); three.setText(a.toString()+"C"); } else { paint(a); a=a*1.8+32; three.setText(a.toString()+"F"); } } if(whice.contentEquals("停止音乐")) { music.stop(); } if(whice.contentEquals("开始音乐")) { music.loop(); } } public void paint(Double a) { Graphics g=Imagepanel.getGraphics();//创建供绘制图像的图形上下文 if(a<15) { ImageIcon at=new ImageIcon("冬.jpg"); Image image=at.getImage(); g.drawImage(image,0,0,800,700,this); } if(15<=a&&a<22) { ImageIcon at=new ImageIcon("春.jpg"); Image image=at.getImage(); g.drawImage(image,0,0,800,700,this); } if(22<=a&&a<27) { ImageIcon at=new ImageIcon("秋.jpg"); Image image=at.getImage(); g.drawImage(image,0,0,800,700,this); } if(27<=a) { ImageIcon at=new ImageIcon("夏.jpg"); Image image=at.getImage(); g.drawImage(image,0,0,800,700,this); } } }