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859天前import java.awt.BorderLayout; |
import java.awt.GridLayout; |
import java.awt.event.ActionEvent; |
import java.awt.event.ActionListener; |
import javax.swing.JButton; |
import javax.swing.JFrame; |
import javax.swing.JPanel; |
import javax.swing.JTextField; |
/** |
* 精简java计算器 |
* |
*/ |
public class Calculator implements ActionListener { |
private JFrame frame; |
private JButton[] bus; |
private JTextField jtx; |
private JButton bu; |
private char[] strs; |
private String d_one = ""; |
private String operator; |
public static void main(String[] args) { |
new Calculator(); |
} |
/* 利用构造进行实例化 */ |
public Calculator() { |
frame = new JFrame("计算器"); |
jtx = new JTextField(14); |
bus = new JButton[16]; |
strs = "789/456*123-0.+=".toCharArray(); |
for (int i = 0; i < 16; i++) { |
bus[i] = new JButton(strs[i] + ""); |
bus[i].addActionListener(this); |
} |
bu = new JButton("C"); |
bu.addActionListener(this); |
init(); |
} |
/* GUI 初始化 */ |
public void init() { |
JPanel jp1 = new JPanel(); |
jp1.add(jtx); |
jp1.add(bu); |
frame.add(jp1, BorderLayout.NORTH); |
JPanel jp2 = new JPanel(); |
jp2.setLayout(new GridLayout(4, 4)); |
for (int i = 0; i < 16; i++) { |
jp2.add(bus[i]); |
} |
frame.add(jp2, BorderLayout.CENTER); |
frame.pack(); |
frame.setLocation(500, 300); |
frame.setVisible(true); |
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); |
} |
/* 事件的处理 */ |
public void actionPerformed(ActionEvent arg0) { |
/* 获取输入字符 */ |
String conn = arg0.getActionCommand(); |
/* 清除计算器内容 */ |
if ("C".equals(conn)) { |
d_one = ""; |
operator = ""; |
jtx.setText(""); |
return; |
} |
/* 暂未实现该功能 */ |
if (".".equals(conn)) { |
return; |
} |
/* 记录运算符，保存运算数字 */ |
if (("+-*/".indexOf(conn)) != -1) { |
if ("".equals(d_one) && "".equals(jtx.getText())) |
return; |
d_one = jtx.getText(); |
operator = conn; |
jtx.setText(""); |
return; |
} |
/* 计算结果 */ |
if ("=".equals(conn)) { |
if ("".equals(d_one) && "".equals(jtx.getText())) |
return; |
double db = 0; |
if ("+".equals(operator)) { |
db = Double.parseDouble(d_one) |
+ Double.parseDouble(jtx.getText()); |
jtx.setText(db + ""); |
} |
if ("-".equals(operator)) { |
db = Double.parseDouble(d_one) |
- Double.parseDouble(jtx.getText()); |
jtx.setText(db + ""); |
} |
if ("*".equals(operator)) { |
db = Double.parseDouble(d_one) |
* Double.parseDouble(jtx.getText()); |
jtx.setText(db + ""); |
} |
if ("/".equals(operator)) { |
db = Double.parseDouble(d_one) |
/ Double.parseDouble(jtx.getText()); |
jtx.setText(db + ""); |
} |
d_one = db + ""; |
return; |
} |
// 界面显示 |
jtx.setText(jtx.getText() + conn); |
} |
} |
