好吧,第一次问一个问题,通常我可以找到这些类型的答案快速搜索,这只是让我太沮丧。 这是一个简单的小程序,需要几小时的工作和支付率才能获得总额和净工资,其中大部分仅仅是我的试运行(净收入等金额),但在我走之前,我想让它工作。actionperformed点击按钮时按下
按下按钮时没有任何反应,不完全确定原因。 (最近,当我尝试这个 - 并且 - 我开始在IE中得到NullPointerException时,可能与我的问题无关,但也只是抛出了那里。)任何帮助表示赞赏,我尝试了一些东西,但我肯定在java上生锈!
继承人的代码:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ButtonGrossPay extends JApplet implements ActionListener
{
private JTextField txtHourWork;
private JTextField txtHourRate;
private JLabel lblGrossPay;
private JLabel lblNetPay;
public void init() {
Container content_pane = getContentPane();
content_pane.setLayout (new FlowLayout());
JLabel lblHourWork = new JLabel("Hours Worked");
JTextField txtHourWork = new JTextField(10);
JLabel lblHourRate = new JLabel("Pay Rate");
JTextField txtHourRate = new JTextField(10);
JButton btnCalculate = new JButton("Calculate Pay");
btnCalculate.addActionListener(this);
content_pane.add (lblHourWork);
content_pane.add(txtHourWork);
content_pane.add(lblHourRate);
content_pane.add(txtHourRate);
content_pane.add(btnCalculate);
content_pane.add(lblGrossPay);
content_pane.add(lblNetPay);
}
public void actionPerformed (ActionEvent event) {
String firstNumber = txtHourWork.getText();
String secondNumber = txtHourRate.getText();
int number1 = Integer.parseInt(firstNumber);
int number2 = Integer.parseInt(secondNumber);
int gross = number1 * number2;
double netPay = 0;
if (gross >= 0 && gross <= 99.99) {
netPay = gross - gross * .10;
} else if (gross >= 99.99) {
netPay = gross - gross * .20;
}
lblGrossPay.setText(Integer.toString(gross));
lblNetPay.setText(Double.toString(netPay));
}
}
完美!谢谢一堆 – user1801794
@ user1801794:不客气。 –