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复利计算器4.1
阅读量：7118 次
发布时间：2019-06-28

本文共 13869 字，大约阅读时间需要 46 分钟。

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 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(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;    }}

转载于:https://www.cnblogs.com/wangzekai/p/5335851.html

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