JAVASwing实现简单的体重指数（BMI）计算器
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。
最终运⾏界⾯：
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（⾝⾼⽶数的平⽅）
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
DecimalFormat;
import *;
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;
/
**
* 体重
*/
private double weight;
/**
* ⾝⾼
*/
private double height;
/**
* BMI指数
*/
*/
private double BMI;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
try {
WeightIndex frame = new WeightIndex();
frame.pack();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
});
}
/**
* Create the frame.
*/
public WeightIndex() {
setTitle("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 = 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(e -> {
String hstr = Text();
String wstr = Text();
Pattern pattern = Patternpile("^[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) {
} 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！";
}javaswing实现购买
}
consoleText.setText("你的指数为：" + df.format(BMI) + "，你的健康状况为：" + out);            }
});
}
}
20190419，对代码进⾏了部分重构。

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