本文实例为大家分享了java实现简单年龄计算器的具体代码，供大家参考，具体内容如下

制作一个如下图年龄计算器

根据题目，我做了一个由Calendar类以及年月日各相减得到的年龄，当然正确的方法不止一个，以下为我的源代码和结果截图：

package com.Date;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Calendar;import java.util.StringTokenizer;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;public class AgeCounts extends JFrame implements ActionListener {JTextField text1, text2;public static String str = "";public static void main(String[] args) {new AgeCounts();}public AgeCounts() {JFrame mywindow = new JFrame();mywindow.setTitle("年龄计算1.0版");mywindow.setSize(400, 70);mywindow.setLocation(350, 300);mywindow.setResizable(false);mywindow.setLayout(new FlowLayout());JLabel lab = new JLabel("生日 ：");mywindow.add(lab);text1 = new JTextField("", 10);text2 = new JTextField("", 10);mywindow.add(text1);JButton btn = new JButton("计算");mywindow.add(btn);btn.addActionListener(this);mywindow.add(text2);text2.setEditable(false);mywindow.setVisible(true);}public void actionPerformed(ActionEvent e) {boolean f = true;str = text1.getText();StringTokenizer st = new StringTokenizer(str, " ");int myYear, myMonth, myDay;try {myYear = Integer.parseInt(st.nextToken());myMonth = Integer.parseInt(st.nextToken());myDay = Integer.parseInt(st.nextToken());if (myMonth > 12 || myMonth < 1) {f = false;text2.setText("日期错误");}if (myDay > 31 || myDay < 1) {f = false;text2.setText("日期错误");}if (myYear < 0) {f = false;text2.setText("日期错误");}if (f) {getAge(myYear, myMonth, myDay);}} catch (Exception e1) {text2.setText("日期格式错误");}}// 年龄计算函数public void getAge(int year, int month, int day) {boolean b = true;Calendar cal = Calendar.getInstance();int yearNow = cal.get(Calendar.YEAR);int monthNow = cal.get(Calendar.MONTH) + 1;int dayNow = cal.get(Calendar.DAY_OF_MONTH);int years, months = 0, days = 0;if (dayNow < day) {dayNow = dayNow + 30;monthNow = monthNow - 1;}if (monthNow < month) {monthNow = monthNow + 12;yearNow = yearNow - 1;}if (yearNow < year) {b = false;text2.setText("你还没有出生哟");}if (b) {years = yearNow - year;months = monthNow - month;days = dayNow - day;String result = years + "岁零" + months + "个月" + days + "天";text2.setText(result);}}}

结果截图：

更多计算器功能实现，请点击专题： 计算器功能汇总 进行学习

关于Android计算器功能的实现，查看专题：Android计算器 进行学习。

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