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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