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
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("呐喊教程 - 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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