停车场收费

 三小时内：3

超过每小时：0.5

最高：10

 

mport java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Charges extends JApplet implements ActionListener{
 int hour;
 float charges,sum=0;
 
 JLabel inLabel;
 JLabel resultLabel;
 JTextField inTextField;
 JTextField resultField;
 JButton rollButton;
 
 public void init()
 {
  Container container=getContentPane();
  container.setLayout(new FlowLayout());
  
  inLabel=new JLabel("Input the hour of(-1=end) :");
  container.add(inLabel);
  
  inTextField=new JTextField(10);
  container.add(inTextField);
  
  resultLabel=new JLabel("The total cost is: ");
  container.add(resultLabel);
  
  resultField=new JTextField(10);
  resultField.setEditable(false);
  container.add(resultField);
  
  rollButton=new JButton("Calculater");
  rollButton.addActionListener(this);
  container.add(rollButton);
 }
 
 public void actionPerformed(ActionEvent event)
 {
  calculater();
  resultField.setText(Float.toString(sum));
 }
 
 public void calculater()
 {  
  hour=Integer.parseInt(inTextField.getText());
  if(hour==-1)
   showStatus("The last data!");
  else{
  if(hour<=3)
   charges=2;
  else
   charges=2+(hour-3)*(float)0.5;
  if(charges>10)
   charges=10;
  
  showStatus("Current costs is: "+charges);
  
  sum+=charges;
  }
 }
}