Java Swing实现简单的体重指数(BMI)计算器功能示例

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(" - 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。