【发布时间】：2014-07-06 15:27:43
【问题描述】：
我想开始我的说法，我已经尝试了大约 2 个小时来找到如何使用 JApplet 为我的小程序命名。我大约两周前才开始使用 GUI。这是我的代码。我在 init(); 中遇到了麻烦。任何帮助都会很棒，谢谢！-Tanner
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class blooddrive_average extends JApplet implements ActionListener
{
JLabel Dep1=new JLabel("Department 1");
JTextField atext1=new JTextField(5);
JLabel Dep2=new JLabel("Department 2");
JTextField atext2=new JTextField(5);
JLabel Dep3=new JLabel("Department 3");
JTextField atext3=new JTextField(5);
JLabel Dep4=new JLabel("Department 4");
JTextField atext4=new JTextField(5);
JLabel Dep5=new JLabel("Department 5");
JTextField atext5=new JTextField(5);
JButton but1=new JButton("Average"); //button 1
JButton but2=new JButton("Clear Fields"); //button 2
Font resfont=new Font("Ravie", Font.BOLD,20);
JLabel average=new JLabel(); //for the action listener
Container c;
FlowLayout flow= new FlowLayout();
public void init()
{
JFrame window=new JFrame();
window.setTitle("A"); //************ this is where i'm having trouble declaring the applets title
c=getContentPane();
c.setLayout(flow);
c.setBackground(Color.white);
Dep1.setForeground(Color.red);
c.add(Dep1);
atext1.setForeground(Color.blue);
c.add(atext1);
Dep2.setForeground(Color.red);
c.add(Dep2);
atext2.setForeground(Color.blue);
c.add(atext2);
Dep3.setForeground(Color.red);
c.add(Dep3);
atext3.setForeground(Color.blue);
c.add(atext3);
Dep4.setForeground(Color.red);
c.add(Dep4);
atext4.setForeground(Color.blue);
c.add(atext4);
Dep5.setForeground(Color.red);
c.add(Dep5);
atext5.setForeground(Color.blue);
c.add(atext5);
but1.setForeground(Color.red);
c.add(but1);
but2.setForeground(Color.red);
c.add(but2);
average.setFont(resfont);
average.setForeground(Color.blue);
c.add(average);
but1.addActionListener(this);
but2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == but1)
{
String text1=atext1.getText();
double number1=Double.parseDouble(text1);
String text2=atext2.getText();
double number2=Double.parseDouble(text2);
String text3=atext3.getText();
double number3=Double.parseDouble(text3);
String text4=atext4.getText();
double number4=Double.parseDouble(text4);
String text5=atext5.getText();
double number5=Double.parseDouble(text5);
double average1=((number1+number2+number3+number4+number5)/5);
average.setText("The average pints of blood donated\n" + " by the five departments is: "+average1);
atext1.setEnabled(false);
atext2.setEnabled(false);
atext3.setEnabled(false);
atext4.setEnabled(false);
atext5.setEnabled(false);
}
else if(e.getSource() == but2)
{
average.setVisible(false);
JLabel Dep1=new JLabel("Department 1");
atext1.setText("");
JLabel Dep2=new JLabel("Department 2");
atext2.setText("");
JLabel Dep3=new JLabel("Department 3");
atext3.setText("");
JLabel Dep4=new JLabel("Department 4");
atext4.setText("");
JLabel Dep5=new JLabel("Department 5");
atext5.setText("");
atext1.setEnabled(true);
atext2.setEnabled(true);
atext3.setEnabled(true);
atext4.setEnabled(true);
atext5.setEnabled(true);
atext1.requestFocus();
}
}
}
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