本文实例讲述了Java Swing实现简单的体重指数(BMI)计算器功能。分享给大家供大家参考，具体如下：
BMI，Body Mass Index，身体质量指数，是用体重公斤数 除以 身高米数平方得出的，是目前国际上常用的衡量人体胖瘦程度以及是否健康的一个标准。
而本文通过运用Java Swing实现了一个简单的BMI计算器。虽然现在网页上也有相应的网页应用，但是能够做出这个计算器来，还是有点成就感的，希望自己以后做出更多比这个好的应用。
最终运行效果：
功能：可以选择三个标准：中国、亚洲、WHO，计算结果稍有不同
计算公式：BMI = weight / (height*height) 即 体重公斤数 除以 身高米数平方
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package WeightIndex;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.util.regex.*;
public class WeightIndex extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JLabel titleLabel;
private JPanel contentPanel;
private JButton submitButton;
private ButtonGroup bg;
private JPanel sexPanel;
private JRadioButton ChinaRadio;
private JRadioButton AsiaRadio;
private JRadioButton WHORadio;
private JPanel whPanel;
private JLabel heightLabel;
private JLabel weightLabel;
private JTextField heightText;
private JTextField weightText;
private JPanel consolePanel;
private JLabel consoleLabel;
private JTextField consoleText;
private double weight;
private double height;
private double BMI;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
WeightIndex frame = new WeightIndex();
frame.pack();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public WeightIndex() {
setTitle("服务器之家 - 身高体重指数计算器v1.0");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
//主容器
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
//标题，主容器北
titleLabel = new JLabel("身高体重指数计算器");
titleLabel.setHorizontalAlignment(SwingConstants.CENTER);
contentPane.add(titleLabel, BorderLayout.NORTH);
//存放选项的panel，主容器中
contentPanel = new JPanel();
contentPanel.setLayout(new BorderLayout());
contentPane.add(contentPanel,BorderLayout.CENTER);
//提交按钮，主容器南
submitButton = new JButton("计算");
contentPane.add(submitButton, BorderLayout.SOUTH);
//存放性别选择的panel，选项北
bg = new ButtonGroup();
sexPanel = new JPanel();
sexPanel.setLayout(new FlowLayout());
contentPanel.add(sexPanel,BorderLayout.NORTH);
ChinaRadio = new JRadioButton("中国标准");
ChinaRadio.setSelected(true);
AsiaRadio = new JRadioButton("亚洲标准");
WHORadio = new JRadioButton("WHO（世界卫生组织）标准");
bg.add(ChinaRadio);
bg.add(AsiaRadio);
bg.add(WHORadio);
sexPanel.add(ChinaRadio);
sexPanel.add(AsiaRadio);
sexPanel.add(WHORadio);
//存放身高体重的panel，选项中
whPanel = new JPanel();
whPanel.setLayout(new FlowLayout());
contentPanel.add(whPanel,BorderLayout.CENTER);
heightLabel = new JLabel("身高（米/m）：");
weightLabel = new JLabel("体重（千克/kg）：");
heightText = new JTextField(10);
heightText.setToolTipText("请输入身高");
weightText = new JTextField(10);
weightText.setToolTipText("请输入体重");
whPanel.add(heightLabel);
whPanel.add(heightText);
whPanel.add(weightLabel);
whPanel.add(weightText);
//结果
consolePanel = new JPanel();
consolePanel.setLayout(new FlowLayout());
consoleLabel = new JLabel("你的身体质量指数为：");
consoleText = new JTextField(28);
consoleText.setEditable(false);
consolePanel.add(consoleLabel);
consolePanel.add(consoleText);
contentPanel.add(consolePanel,BorderLayout.SOUTH);
submitButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
String hstr = heightText.getText();
String wstr = weightText.getText();
Pattern pattern = Pattern.compile("^[0-9]+(.[0-9]+)?$");
Matcher hisNum = pattern.matcher(hstr);
Matcher wisNum = pattern.matcher(wstr);
boolean acc = true;
if( !hisNum.matches()|| !wisNum.matches()){
acc = false;
}
if(acc)
{
height = Double.parseDouble(hstr);
weight = Double.parseDouble(wstr);
BMI = weight / (height*height);
DecimalFormat df = new DecimalFormat("#.0");
String out = "";
if(ChinaRadio.isSelected())
{
if(BMI<18.5)
out = "偏瘦，瘦骨嶙峋的，多吃点吧！";
else if(BMI<23.9)
out = "正常，棒棒哒！";
else if(BMI<28)
out = "偏胖，你胖你就运动减肥！";
else if(BMI>=28)
out = "肥胖，现在减肥来的及！";
else
out ="外星人派来的你哦，请重新输入！";
}
else if(AsiaRadio.isSelected())
{
if(BMI<18.5)
out = "偏瘦，瘦骨嶙峋的，多吃点吧！";
else if(BMI<22.9)
out = "正常，棒棒哒！";
else if(BMI<24.9)
out = "偏胖，你胖你就运动减肥！";
else if(BMI<30)
out = "肥胖，现在减肥来的及！";
else if(BMI>=30)
out = "重度肥胖，不是一般人，赶紧减肥吧！";
else
out ="外星人派来的你哦，请重新输入！";
}
else
{
if(BMI<18.5)
out = "偏瘦，瘦骨嶙峋的，多吃点吧！";
else if(BMI<24.9)
out = "正常，棒棒哒！";
else if(BMI<29.9)
out = "偏胖，你胖你就运动减肥！";
else if(BMI<34.9)
out = "肥胖，现在减肥来的及！";
else if(BMI<39.9)
out = "重度肥胖，不是一般人，赶紧减肥吧！";
else if(BMI>=40)
out = "极重度肥胖,那可能得去医院看看咯！";
else
out ="外星人派来的你哦，请重新输入！";
}
consoleText.setText("你的指数为："+df.format(BMI)+"，你的健康状况为："+out);
}
}
});
}
}
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希望本文所述对大家java程序设计有所帮助。
原文链接：http://blog.csdn.net/u010992313/article/details/72083337