【自动化__GUI自动化】__java__案例__java应用程序计算器

 

 

一、代码如下

package www.woniu.gui.one;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MyCalc__Swing extends JFrame {
// 定义界面元素、完成初始化操作
private JPanel jpanel = new JPanel();
private JLabel jlable1 = new JLabel("运算数一");
private JLabel jlable2 = new JLabel("运算数二");
private JLabel jlable3 = new JLabel("运算类型");
private JLabel jlable4 = new JLabel("计算结果");
private JButton btnCalc = new JButton("计算");
private JButton btnClose = new JButton("关闭");

// 定义运算数一、运算数二
private JTextField txtNumberX = new JTextField("1");
private JTextField txtNumbery = new JTextField("2");

// 定义下拉框：加、减、乘、除
private JComboBox<String> calcType = new JComboBox<String>();
private JLabel lblResult = new JLabel("结果在此显示.......S");

public static void main(String[] args) {
// TODO Auto-generated method stub
MyCalc__Swing calc = new MyCalc__Swing();
calc.windowInit();
calc.buttonInvoke();

}

// 窗口初始化操作，设置元素大小、位置、初始值
private void windowInit() {
// TODO Auto-generated method stub
// 窗口基本属性
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setSize(420, 280);
this.setTitle("Java演示程序");

// 控件属性、窗口位置
jlable1.setSize(new Dimension(80, 20));
jlable1.setFont(new Font("Dialog", Font.BOLD, 12));
jlable1.setLocation(new Point(58, 40));

jlable2.setSize(new Dimension(80, 20));
jlable2.setLocation(new Point(58, 74));

jlable3.setSize(new Dimension(80, 20));
jlable3.setLocation(new Point(58, 108));

jlable4.setSize(new Dimension(80, 20));
jlable4.setLocation(new Point(58, 148));

txtNumberX.setLocation(new Point(162, 41));
txtNumberX.setName("txtNumberX");
txtNumberX.setSize(new Dimension(160, 21));

txtNumbery.setLocation(new Point(162, 74));
txtNumbery.setName("txtNumberY");
txtNumbery.setSize(new Dimension(160, 21));

// 为下拉框添4个加运算符
calcType.addItem("加法");
calcType.addItem("减法");
calcType.addItem("乘法");
calcType.addItem("除法");
calcType.setLocation(new Point(162, 108));
calcType.setName("calcType");
calcType.setSize(new Dimension(160, 21));

lblResult.setSize(new Dimension(150, 20));
lblResult.setName("lblResult");
lblResult.setBackground(Color.white);
lblResult.setLocation(new Point(162, 148));

btnCalc.setLocation(new Point(91, 190));
btnCalc.setName("btnCalc");
btnCalc.setSize(new Dimension(90, 21));

btnClose.setLocation(new Point(210, 190));
btnClose.setName("btnClose");
btnClose.setSize(new Dimension(80, 21));

// 将控件放到容器中
jpanel.setLayout(null);
jpanel.add(jlable1);
jpanel.add(jlable2);
jpanel.add(jlable3);
jpanel.add(jlable4);
jpanel.add(txtNumberX);
jpanel.add(txtNumbery);
jpanel.add(lblResult);
jpanel.add(btnCalc);
jpanel.add(btnClose);
jpanel.add(calcType);
this.add(jpanel);

}

// 执行运算和关闭应用程序
private void buttonInvoke() {
// TODO Auto-generated method stub
btnClose.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
doClose();
}
});

btnCalc.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
double numberX = Double.parseDouble(txtNumberX.getText());
double numberY = Double.parseDouble(txtNumbery.getText());
double result = doCalc(numberX, numberY);
lblResult.setText(String.valueOf(result));
}
});

}

// 关闭应用程序
private void doClose() {
// TODO Auto-generated method stub
System.exit(1);
}

// 计算操作
public double doCalc(double x, double y) {
// TODO Auto-generated method stub
double result = 0;
if(calcType.getSelectedItem().equals("加法")) {
result= x + y;
}else if(calcType.getSelectedItem().equals("减法")) {
result= x - y;
}else if(calcType.getSelectedItem().equals("乘法")) {
result= x * y;
}else if(calcType.getSelectedItem().equals("除法")) {
result= x / y;
}

return result;
}

}