package com.fulijisuanqi.swing;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
* 本次更新主要更新了在输入过程中输入负数或者零的处理方法，
* 更新以后如果输入的数小于或等于零会弹框提示，并且不会输出结果
*/
public class calcutor extends JFrame{
public static void main(String[] args) {
// TODO Auto-generated method stub
calcutor frame = new calcutor();
frame.setVisible(true);
frame.setBounds(100, 100, 400, 400);
frame.setTitle("计算器3.1");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private JPanel jpanel;
private JLabel label,label00,label01,label02,label03,label04,label05;
private JComboBox<Object> box;
private JTextField field01,field02,field03,field04,field05;
private JButton button;
private static double benjin,lilv,nianxian,zhongzhi,dingtou,huankuan,daikuan;
private int index = 0;
public calcutor(){
jpanel = new JPanel();
jpanel.setBounds(0, 0, 400, 400);
jpanel.setLayout(null);
add(jpanel);
label = new JLabel("计算类型：");
label.setFont(new Font(null, Font.BOLD, 15));
label.setBounds(10, 10, 80, 30);
jpanel.add(label);
label00 = new JLabel("@113wangzekai");
label00.setFont(new Font(null, Font.BOLD, 15));
label00.setBounds(260, 320, 200, 30);
jpanel.add(label00);
label01 = new JLabel("本金：");
label01.setFont(new Font(null, Font.BOLD, 15));
label01.setBounds(30, 80, 80, 30);
jpanel.add(label01);
label02 = new JLabel("年利率%：");
label02.setFont(new Font(null, Font.BOLD, 15));
label02.setBounds(30, 130, 80, 30);
jpanel.add(label02);
label03 = new JLabel("年限：");
label03.setFont(new Font(null, Font.BOLD, 15));
label03.setBounds(30, 180, 80, 30);
jpanel.add(label03);
label04 = new JLabel("定投金额：");
label04.setFont(new Font(null, Font.BOLD, 15));
label04.setBounds(30, 230, 80, 30);
jpanel.add(label04);
label05 = new JLabel("终值：");
label05.setFont(new Font(null, Font.BOLD, 15));
label05.setBounds(30, 280, 80, 30);
jpanel.add(label05);
//文本框
field01 = new JTextField();
field01.setBounds(120, 80, 150, 30);
jpanel.add(field01);
field02 = new JTextField();
field02.setBounds(120, 130, 150, 30);
jpanel.add(field02);
field03 = new JTextField();
field03.setBounds(120, 180, 150, 30);
jpanel.add(field03);
field04 = new JTextField();
field04.setBounds(120, 230, 150, 30);
jpanel.add(field04);
field05 = new JTextField();
field05.setBounds(120, 280, 150, 30);
jpanel.add(field05);
//初始化文本框
field05.setText("计算所得");
field05.setEnabled(false);
//计算按钮
button = new JButton("计算");
button.setBounds(250, 10, 80, 30);
button.setFont(new Font(null, Font.BOLD, 15));
jpanel.add(button);
//按钮监听
button.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e){
if(index == 0){
zhongzhi = fulicalcutor();
if(zhongzhi != -1){
field05.setText(Double.toString(zhongzhi));
field05.setEnabled(true);
}
}else if(index == 1){
zhongzhi = danlicalcutor();
if(zhongzhi != -1){
field04.setText(Double.toString(zhongzhi));
field04.setEnabled(true);
}
}else if(index == 2){
benjin = benjincalcutor();
if(benjin != -1){
field01.setText(Double.toString(benjin));
field01.setEnabled(true);
}
}else if(index == 3){
lilv = lilvcalcutor();
if(lilv != -1){
field02.setText(Double.toString(lilv));
field02.setEnabled(true);
}
}else if(index == 4){
nianxian = nianxiancalcutor();
if(nianxian != -1){
field03.setText(Double.toString(nianxian));
field03.setEnabled(true);
}
}else if(index == 5){
huankuan = yuehuankuanejisuan();
if(huankuan != -1){
field04.setText(Double.toString(huankuan));
field04.setEnabled(true);
}
}
}
});
//下拉菜单
box = new JComboBox<>();
box.setFont(new Font(null, Font.BOLD, 15));
box.setModel(new DefaultComboBoxModel<Object>(new Object[]{"复利计算","单利计算","本金计算","利率计算","年限计算","月还款额计算"}));
box.setBounds(90, 10, 130, 30);
jpanel.add(box);
box.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
if(box.getSelectedIndex()==0){
index = 0;
change01();
clear();
field05.setText("计算所得");
field05.setEnabled(false);
//System.out.println("复利计算");
}else if(box.getSelectedIndex()==1){
index = 1;
change();
clear();
field04.setText("计算所得");
field04.setEnabled(false);
//System.out.println("单利计算");
}else if(box.getSelectedIndex()==2){
index = 2;
change();
clear();
field01.setText("计算所得");
field01.setEnabled(false);
//System.out.println("本金计算");
}else if(box.getSelectedIndex()==3){
index = 3;
change();
clear();
field02.setText("计算所得");
field02.setEnabled(false);
//System.out.println("利率计算");
}else if(box.getSelectedIndex()==4){
index = 4;
change();
clear();
field03.setText("计算所得");
field03.setEnabled(false);
}else if(box.getSelectedIndex()==5){
index = 5;
change02();
clear();
field04.setText("计算所得");
field04.setEnabled(false);
}
}
});
}
//清除数据
private void clear() {
field01.setText(null);
field02.setText(null);
field03.setText(null);
field04.setText(null);
field05.setText(null);
field01.setEnabled(true);
field02.setEnabled(true);
field03.setEnabled(true);
field04.setEnabled(true);
field05.setEnabled(true);
}
//改变内容
private void change02() {
label01.setText("贷款金额：");
label02.setText("年利率%：");
label03.setText("还款期限：");
label04.setText("月还款额：");
label05.setText("");
field05.setVisible(false);
}
private void change01() {
label01.setText("本金：");
label02.setText("年利率%：");
label03.setText("年限：");
label04.setText("定投金额：");
label05.setText("终值：");
field05.setVisible(true);
}
private void change() {
label01.setText("本金：");
label02.setText("年利率%：");
label03.setText("年限：");
label04.setText("终值：");
label05.setText("");
field05.setVisible(false);
}
//月还款额计算
private double yuehuankuanejisuan() {
try {
daikuan = Double.parseDouble(field01.getText());
lilv = Double.parseDouble(field02.getText());
nianxian = Double.parseDouble(field03.getText());
//小于或等于0的处理
if(daikuan <= 0 || lilv <= 0 || nianxian <= 0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return yuehuankuan(daikuan,lilv,nianxian);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//月还款额的计算公式
public final double yuehuankuan(double daikuan, double lilv, double nianxian) {
huankuan = daikuan * (lilv/12) * Math.pow( 1 + lilv/12 ,12 * nianxian)/(Math.pow(1 + lilv/12, 12 * nianxian)-1);
huankuan = Math.round(huankuan*100)/100;
return huankuan;
}
//年限计算
private double nianxiancalcutor() {
try {
zhongzhi = Double.parseDouble(field04.getText());
lilv = Double.parseDouble(field02.getText());
benjin = Double.parseDouble(field01.getText());
//小于或等于0的处理
if(zhongzhi<=0 || lilv<=0 || benjin<=0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return nianxian(zhongzhi,lilv,benjin);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//年限的计算公式
public final double nianxian(double zhongzhi, double lilv, double benjin) {
nianxian = (Math.log(zhongzhi / benjin) / Math.log(1 + lilv));
nianxian = Math.round(nianxian);
return nianxian;
}
//利率计算
private double lilvcalcutor() {
try {
zhongzhi = Double.parseDouble(field04.getText());
nianxian = Double.parseDouble(field03.getText());
benjin = Double.parseDouble(field01.getText());
//小于或等于0的处理
if(zhongzhi <= 0 || benjin <= 0 || nianxian <= 0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return lilv(zhongzhi,nianxian,benjin);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//利率的计算公式
public final double lilv(double zhongzhi, double nianxian, double benjin) {
lilv = Math.pow((zhongzhi / benjin), (1.0 / nianxian)) - 1;
lilv = Math.round(lilv*100)/100.0;
return lilv;
}
//本金计算
private double benjincalcutor() {
try {
zhongzhi = Double.parseDouble(field04.getText());
lilv = Double.parseDouble(field02.getText());
nianxian = Double.parseDouble(field03.getText());
//小于或等于0的处理
if(zhongzhi <= 0 || lilv <= 0 || nianxian <= 0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return benjin(zhongzhi,lilv,nianxian);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//本金的计算公式
public final double benjin(double zhongzhi, double lilv, double nianxian) {
benjin = zhongzhi / (Math.pow(1 + lilv, nianxian));
benjin = Math.round(benjin*100)/100;
return benjin;
}
//单利计算
private double danlicalcutor() {
try {
benjin = Double.parseDouble(field01.getText());
lilv = Double.parseDouble(field02.getText());
nianxian = Double.parseDouble(field03.getText());
//小于或等于0的处理
if(benjin<=0 || lilv<=0 || nianxian<=0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return zhongzhi(benjin, lilv, nianxian);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//单利的计算公式
public final double zhongzhi(double benjin, double lilv, double nianxian) {
zhongzhi = benjin * (1 + lilv * nianxian);
zhongzhi = Math.round(zhongzhi*100)/100;
return zhongzhi;
}
//复利计算
private double fulicalcutor() {
try {
benjin = Double.parseDouble(field01.getText());
lilv = Double.parseDouble(field02.getText());
nianxian = Double.parseDouble(field03.getText());
try {
dingtou = Double.parseDouble(field04.getText());
} catch (NumberFormatException e2) {
dingtou = 0;
}
//小于或等于0的处理
if(benjin<=0 || lilv<=0 || nianxian<=0){
JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零\n"
+ " 请重新输入");
}else{
return zhongzhi(benjin, lilv, nianxian, dingtou);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
//System.out.println("请输入数据");
}
return -1;
}
//复利的计算公式
public final double zhongzhi(double benjin, double lilv, double nianxian,
double dingtou) {
for(int i = 0;i < nianxian;i++){
benjin = benjin * (1 + lilv);
benjin = benjin + dingtou;
}
zhongzhi = benjin - dingtou;
zhongzhi = Math.round(zhongzhi*100)/100;
return zhongzhi;
}
}
