[자바] 대화 상자 프로그램 포팅 : Java JWT 기반(복리 이자 계산기 만들기 2)

 

이전 글에 이어 계산 버튼에 대한 이벤트 처리기를 추가합니다.

 

각 버튼에 대한 이벤트 처리를 위해 아래와 같이 코딩해줍니다.

        // 초기화
        tfPrincipal.setText("0,00");
        tfInerestRate.setText("7.55");
        tfPeriod.setText("0");
        tfInterestEarned.setText("0.00");
        tfAmountEarned.setText("0.00");
        checkPeriod1Month.setState(true);

        // 닫기 버튼
        buttonClose.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        // 계산 버튼
        buttonCalc.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String strPrincipal = tfPrincipal.getText();
                String strInterest = tfInerestRate.getText();
                String strPeriod = tfPeriod.getText();

                double fPrincipal = Double.parseDouble(strPrincipal);
                double fInterest = Double.parseDouble(strInterest);
                fInterest /= 100;
                int iPriod = Integer.parseInt(strPeriod);
                int iCompundType = 12;

                if (checkPeriod1Month.getState() == true)
                    iCompundType = 12;
                else if (checkPeriod3Month.getState() == true)
                    iCompundType = 4;
                else if (checkPeriod6Month.getState() == true)
                    iCompundType = 2;
                else
                    iCompundType = 1;

                double fcompoundInterest =
                        fInterest / iCompundType;
                int n = iCompundType * iPriod;

                double fRatePerPeriod = fInterest / iPriod;
                double fFutureValue =
                        fPrincipal * Math.pow(
                                1 + fcompoundInterest, n);
                double fInterestEarned = fFutureValue - fPrincipal;

                String strInterestEarned = String.format("$%,2f", fInterestEarned);
                String strAmountEarned = String.format("$%,2f", fFutureValue);

                tfInterestEarned.setText(strInterestEarned);
                tfAmountEarned.setText(strAmountEarned);
            }
        });

 

전체 완성 코드

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Main {
    public static void main(String[] args) {
        Frame calcFrame = new Frame();
        calcFrame.setTitle("복리 이자 계산기");
        calcFrame.setBounds(100,100,600,400);
        calcFrame.setResizable(false);

        calcFrame.setLayout(null);

        Button buttonCalc = new Button("계산");
        Button buttonClose = new Button("닫기");

        buttonCalc.setBounds(500,30,90,40);
        buttonClose.setBounds(500,75,90,40);

        calcFrame.add(buttonCalc);
        calcFrame.add(buttonClose);

        calcFrame.setBackground(Color.LIGHT_GRAY);

        Panel panelLeft = new Panel() {
            public void paint(Graphics g) {
                g.setColor(Color.BLACK);
                g.drawRect(5,5,230,230);
                g.setColor(Color.LIGHT_GRAY);
                g.drawLine(7,5,37,5);
                g.setColor(Color.BLACK);
                g.drawString("준비",10,10);
            }
        };

        panelLeft.setBounds(10,35,240,240);
        calcFrame.add(panelLeft);

        Panel panelRight = new Panel() {
            public void paint(Graphics g) {
                g.setColor(Color.BLACK);
                g.drawRect(5,5,230,230);
                g.setColor(Color.LIGHT_GRAY);
                g.drawLine(7,5,92,5);
                g.setColor(Color.BLACK);
                g.drawString("복리 계산 주기",10,10);
            }
        };

        panelRight.setBounds(250,35,240,240);
        calcFrame.add(panelRight);

        Panel panelBottom = new Panel() {
            public void paint(Graphics g) {
                g.setColor(Color.BLACK);
                g.drawRect(5,5,470,105);
                g.setColor(Color.LIGHT_GRAY);
                g.drawLine(7,5,37,5);
                g.setColor(Color.BLACK);
                g.drawString("결과",10,10);
            }
        };

        panelBottom.setBounds(10,275,480,115);
        calcFrame.add(panelBottom);

        panelLeft.setLayout(null);

        Label labelPrincipal = new Label("원금");
        labelPrincipal.setBounds(30,30,40,50);
        panelLeft.add(labelPrincipal);

        Label labelInterestRate = new Label("이율");
        labelInterestRate.setBounds(30,100,40,50);
        panelLeft.add(labelInterestRate);

        Label labelPeriod = new Label("기간");
        labelPeriod.setBounds(30,170,40,50);
        panelLeft.add(labelPeriod);

        final TextField tfPrincipal = new TextField(16);
        tfPrincipal.setBounds(70,38,100,30);
        panelLeft.add(tfPrincipal);

        final TextField tfInerestRate = new TextField(16);
        tfInerestRate.setBounds(70,108,100,30);
        panelLeft.add(tfInerestRate);

        final TextField tfPeriod = new TextField(16);
        tfPeriod.setBounds(70,178,100,30);
        panelLeft.add(tfPeriod);

        Label labelPer = new Label("%");
        labelPer.setBounds(180,100,40,50);
        panelLeft.add(labelPer);

        Label labelYears = new Label("years");
        labelYears.setBounds(180,170,40,50);
        panelLeft.add(labelYears);

        CheckboxGroup group = new CheckboxGroup();
        final Checkbox checkPeriod1Month =
                new Checkbox("    1개월",group,false);
        final Checkbox checkPeriod3Month =
                new Checkbox("    3개월",group,false);
        final Checkbox checkPeriod6Month =
                new Checkbox("    6개월",group,false);
        final Checkbox checkPeriod1Year =
                new Checkbox("    12개월",group,true);

        panelRight.setLayout(null);

        checkPeriod1Month.setBounds(50,30,80,50);
        checkPeriod3Month.setBounds(50,80,80,50);
        checkPeriod6Month.setBounds(50,130,80,50);
        checkPeriod1Year.setBounds(50,180,80,50);

        panelRight.add(checkPeriod1Month);
        panelRight.add(checkPeriod3Month);
        panelRight.add(checkPeriod6Month);
        panelRight.add(checkPeriod1Year);

        panelBottom.setLayout(null);

        Label labelInterestEarnd = new Label("이자");
        labelInterestEarnd.setBounds(30,30,40,50);
        panelBottom.add(labelInterestEarnd);

        Label labelAmountEarnd = new Label("총액");
        labelAmountEarnd.setBounds(230,30,40,50);
        panelBottom.add(labelAmountEarnd);

        final TextField tfInterestEarned = new TextField(16);
        tfInterestEarned.setBounds(70,38,100,30);
        panelBottom.add(tfInterestEarned);

        final TextField tfAmountEarned = new TextField(16);
        tfAmountEarned.setBounds(270,38,100,30);
        panelBottom.add(tfAmountEarned);

        // 초기화
        tfPrincipal.setText("0,00");
        tfInerestRate.setText("7.55");
        tfPeriod.setText("0");
        tfInterestEarned.setText("0.00");
        tfAmountEarned.setText("0.00");
        checkPeriod1Month.setState(true);

        // 닫기 버튼
        buttonClose.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        // 계산 버튼
        buttonCalc.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String strPrincipal = tfPrincipal.getText();
                String strInterest = tfInerestRate.getText();
                String strPeriod = tfPeriod.getText();

                double fPrincipal = Double.parseDouble(strPrincipal);
                double fInterest = Double.parseDouble(strInterest);
                fInterest /= 100;
                int iPriod = Integer.parseInt(strPeriod);
                int iCompundType = 12;

                if (checkPeriod1Month.getState() == true)
                    iCompundType = 12;
                else if (checkPeriod3Month.getState() == true)
                    iCompundType = 4;
                else if (checkPeriod6Month.getState() == true)
                    iCompundType = 2;
                else
                    iCompundType = 1;

                double fcompoundInterest =
                        fInterest / iCompundType;
                int n = iCompundType * iPriod;

                double fRatePerPeriod = fInterest / iPriod;
                double fFutureValue =
                        fPrincipal * Math.pow(
                                1 + fcompoundInterest, n);
                double fInterestEarned = fFutureValue - fPrincipal;

                String strInterestEarned = String.format("$%,2f", fInterestEarned);
                String strAmountEarned = String.format("$%,2f", fFutureValue);

                tfInterestEarned.setText(strInterestEarned);
                tfAmountEarned.setText(strAmountEarned);
            }
        });

         calcFrame.setVisible(true);

         calcFrame.addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosing(WindowEvent e) {
                 super.windowClosing(e);
                 System.exit(0);
             }
         });
    }
}

 

각 텍스트 필드에 숫자를 넣으면 계산이 됩니다