public class MainFrame extends JFrame {
/**
* 文本框
*/
private TextField[] texts = new TextField[5];
/**
* 标签
*/
private JLabel[] labels = new JLabel[5];
/**
* 标签值
*/
private String[] labelTexts = {"存入本金:","年利率(%):","存入年限:","年复利次数:","复利终值:"};
/**
* 确定按钮
*/
private JButton jbtOk = new JButton("确定");
/**
* 退出按钮
*/
private JButton jbtExit = new JButton("退出");
/**
* 利率获取时间的整数倍
*/
private double N;
/**
* 复利终值
*/
private double F;
/**
* 存入年限
*/
private double Y;
/**
* 本金
*/
private double P;
/**
* 利率
*/
private double R;
/**
* 本金计算方式
*/
private boolean pFlag;
/**
* 复利计算方式
*/
private boolean fFlag;
/**
* 主窗体
*/
public MainFrame() {
this.setTitle("复利计算器");
this.setBoundAtCenter();
this.setResizable(true);
//this.setLayout(new VFlowLayout());
this.add(this.createTextPanel(), BorderLayout.CENTER);
this.add(this.createButtonPanel(), BorderLayout.SOUTH);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
}
/**
* 居中窗体
*/
private void setBoundAtCenter() {
Toolkit toolkit = Toolkit.getDefaultToolkit();
Dimension dim = toolkit.getScreenSize();
this.setSize(245, 350);
int width = dim.width - this.getWidth() >> 1;
int hight = (dim.height - this.getHeight() >> 1) - 32;
this.setLocation(width, hight);
}
/**
* 初始化文本框与标签位置以及标签值
*/
private void initTextField() {
int x = 90;
int y = 50;
int w = 130;
int h = 20;
for (int i = 0; i < texts.length; i++) {
texts[i] = new TextField(x, y, w, h);
labels[i] = new JLabel(labelTexts[i]);
labels[i].setBounds(x-80, y, w, h);
y += 28;
}
}
/**
* 创建面板存放TextField和label
*/
private JPanel createTextPanel() {
JPanel panel = new JPanel();
panel.setLayout(null);
this.initTextField();
for (int i = 0; i < texts.length; i++) {
panel.add(texts[i]);
panel.add(labels[i]);
}
return panel;
}
/**
* 设置按钮以及监听
*/
private JPanel createButtonPanel(){
JPanel btnPanel = new JPanel(new VFlowLayout());
JPanel btnPanel1 = new JPanel(new FlowLayout());
//----------设置jbtOk的监听------------------
this.jbtOk.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(!pFlag) {
texts[0].setText(String.valueOf(calculatePrincipal()));
}else {
texts[4].setText(String.valueOf(calculateCInterest()));
}
}
});
btnPanel1.add(this.jbtOk);
//----------设置jbtExit的监听------------------
this.jbtExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
System.exit(EXIT_ON_CLOSE);
}
});
btnPanel1.add(this.jbtExit);
//先添加ButtonGroup
btnPanel.add(this.createButtonGroup());
btnPanel.add(btnPanel1);
return btnPanel;
}
/**
* 设置jradio按钮以及监听
*/
private JPanel createButtonGroup() {
JPanel grpPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
ButtonGroup btnGrp = new ButtonGroup();
JRadioButton jrb1 = new JRadioButton("本金");
//----------设置jrb1的监听------------------
jrb1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
pFlag = false;
fFlag = true;
changeType();
}
});
btnGrp.add(jrb1);
JRadioButton jrb2 = new JRadioButton("复利");
//----------设置jrb2的监听------------------
jrb2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
pFlag = true;
fFlag = false;
changeType();
}
});
btnGrp.add(jrb2);
grpPanel.add(jrb1);
grpPanel.add(jrb2);
return grpPanel;
}
private void changeType() {
this.texts[0].setEnabled(pFlag);
this.texts[4].setEnabled(fFlag);
if(pFlag) {
this.texts[4].setText("由此得出数值");
this.texts[0].setText(null);
} else {
this.texts[0].setText("由此得出数值");
this.texts[4].setText(null);
}
}
/**
* F=P*(1+i)N(次方)
* F：复利终值
* P：本金
* R：利率
* N：利率获取时间的整数倍
* Y: 存入年限
*
* 计算本金
*/
private double calculatePrincipal(){
this.R = Double.parseDouble(this.texts[1].getText().trim());
this.Y = Double.parseDouble(this.texts[2].getText().trim());
this.N = Double.parseDouble(this.texts[3].getText().trim());
this.F = Double.parseDouble(this.texts[4].getText().trim());
System.out.println(Math.pow((1+R),N));
return F/Math.pow((1+R),N);
}
/**
* 计算复利
*/
private double calculateCInterest(){
this.P = Double.parseDouble(this.texts[0].getText().trim());
this.R = Double.parseDouble(this.texts[1].getText().trim());
this.Y = Double.parseDouble(this.texts[2].getText().trim());
this.N = Double.parseDouble(this.texts[3].getText().trim());
return P*Math.pow((1+R),N);
}
}