优化版计算器 博客分类： Java基础 小程序

在做完xp画板后对计算器进行了一次优化改进
图片：
首先是优化了界面的样式和代码，界面采用了默认的边框布局
private void showUI() {
// TODO Auto-generated method stub
JFrame jf = new JFrame();
jf.setTitle("计算器");
jf.setSize(new Dimension(220, 350));
jf.setDefaultCloseOperation(3);
jf.setLocationRelativeTo(null);
jf.setResizable(false);
createBackground(jf);
createMenuPane(jf);
createShowPane(jf);
createFuctionPane(jf);
jf.setVisible(true);
}
在设计界面上加入了菜单栏，以及增加了一些功能按钮
private void createMenuPane(JFrame jf) {
// TODO Auto-generated method stub
JMenuBar jm = new JMenuBar();
String [] array = {"查看","编辑","帮助"};
String [][] arrayItem = {{"标准型","科学型","程序员"},{"复制","粘贴"},
{"查看帮助","开发者"}};
MenuListener ml = new MenuListener();
//利用数组进行循环，创建JMenu对象
for(int i=0;i<array.length;i++){
JMenu menu = new JMenu(array[i]);

for(int j=0;j<arrayItem[i].length;j++){
JMenuItem jbm = new JMenuItem(arrayItem[i][j]);
menu.add(jbm);

jbm.addActionListener(ml);
}
jm.add(menu);
}
jf.add(jm,BorderLayout.NORTH);
}
这是菜单栏的代码，虽然对于查看和编辑栏的功能还没有实现
private void createShowPane(JFrame jf) {
// TODO Auto-generated method stub
JPanel panel = new JPanel();

panel.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));

text1.setPreferredSize(new Dimension(200, 50));

text1.setEditable(false);

text1.setText("0");

text1.setHorizontalAlignment(JTextField.RIGHT);
Font font1 = new Font("宋体", Font.BOLD, 20);
text1.setFont(font1);


panel.add(text1);

panel.setOpaque(false);
jf.add(panel, BorderLayout.CENTER);
}
文本显示框的代码

private void createFuctionPane(JFrame jf) {
// TODO Auto-generated method stub
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(220,220));
panel.setLayout(new BorderLayout());
JPanel NumP = new JPanel();
NumP.setLayout(new FlowLayout(FlowLayout.LEFT,7,7));

// 定义一个字符串数组
String[] s1 = { "mc", "mr", "ms", "m+","back", "ce", "c",
"*", "7", "8", "9", "chu", "4", "5",
"6", "cheng", "1", "2", "3", "jian", "0", "dian", "jia" };

//循环数组
for(int i=0;i<s1.length;i++){
//实例化ImageIcon的对象
ImageIcon image = new ImageIcon(this.getClass().getResource(s1[i]+".png"));
//System.out.println(image);
JButton jbu = new JButton(image);

jbu.setActionCommand(s1[i]);

if(s1[i].equals("0")){
jbu.setPreferredSize(new Dimension(73,27));
}else{
jbu.setPreferredSize(new Dimension(34,27));
}
//给事件源jbu添加一个动作监听器方法，绑定事件处理类的对象cl
jbu.addActionListener(cl);
NumP.add(jbu);
}
panel.add(NumP,BorderLayout.CENTER);
JPanel FucP = new JPanel();
FucP.setLayout(new FlowLayout(FlowLayout.LEFT, 7, 7));
FucP.setPreferredSize(new Dimension(50,0));
String[] s2 = { "m-", "gh", "bfh", "fs", "dh" };
//循环数组
for(int i=0;i<s2.length;i++){
//实例化ImageIcon的对象
ImageIcon image = new ImageIcon(this.getClass().getResource(s2[i]+".png"));
JButton jbu = new JButton(image);
//设置按钮的动作命令
jbu.setActionCommand(s2[i]);
if(s2[i].equals("dh")){
jbu.setPreferredSize(new Dimension(34,61));
}else{
jbu.setPreferredSize(new Dimension(34,27));
}
//给事件源jbu添加一个动作监听器方法，绑定事件处理类的对象cl
jbu.addActionListener(cl);
FucP.add(jbu);
}
panel.add(FucP, BorderLayout.EAST);
jf.add(panel, BorderLayout.SOUTH);
}
功能按钮的代码，可以实现基础四则运算和√，M+，M-等复杂运算，
其中由于由于文本框和运算监听器反复使用所以设置为了属性

private JTextField text1 = new JTextField();

private calListener cl = new calListener(text1);