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;
}
}
}