dd.zip_K._温度转换

import java.awt.*; import javax.swing.*; import java.awt.event.*; class myexpr extends Exception { /** * */ private static final long serialVersionUID = 1L; myexpr() { super(); } } public class dd extends JFrame implements ActionListener {/** * */ private static final long serialVersionUID = 1L; double t; JTextField txt1; JLabel lb1,lb2,lb3; JButton btn; JPanel p1; ImageIcon icon1,icon2,icon3; public dd() { icon1=new ImageIcon("6.gif"); icon2=new ImageIcon("7.gif"); icon3=new ImageIcon("8.gif"); txt1=new JTextField(50); lb1=new JLabel("摄氏温度"); lb2=new JLabel("华氏温度"); lb3=new JLabel("K氏温度"); btn=new JButton("转换",icon1); p1=new JPanel(); p1.setLayout(new GridLayout(5,2)); p1.add(txt1); p1.add(lb1); p1.add(btn); p1.add(lb2); p1.add(lb3); getContentPane().add(p1); btn.addActionListener(this); } public void actionPerformed(ActionEvent e) {try{double c;double k; String str; btn.setIcon(icon2); btn.setIcon(icon3); t=Double.parseDouble(txt1.getText()); k=Double.parseDouble(txt1.getText()); c=(t*9/5+32); k=c+273; str=String.valueOf(c); String str1 = String.valueOf(k); //System.out.println(c); check(); // lb2.setText("超界了"); lb2.setText(str); lb3.setText(str1); } catch(myexpr x) { lb2.setText("您输入的温度值超界了"); } catch(Exception m) { lb2.setText("请规范您的输入"); } } public void check()throws myexpr { if(t<-273.15) throw new myexpr(); } public static void main(String args[]) { dd b=new dd(); b.setSize(300,300); b.show(); } }