Java/CoreJava/v2ch06/tableModel/InvestmentTable.java at master · mthli/Java · GitHub

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package tableModel;

import java.awt.*;

import javax.swing.*;

import javax.swing.table.*;

/**

* This program shows how to build a table from a table model.

* @version 1.02 2007-08-01

* @author Cay Horstmann

public class InvestmentTable

{

public static void main(String[] args)

{

EventQueue.invokeLater(new Runnable()

{

public void run()

{

JFrame frame = new InvestmentTableFrame();

frame.setTitle("InvestmentTable");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

});

}

/**

* This frame contains the investment table.

class InvestmentTableFrame extends JFrame

{

public InvestmentTableFrame()

{

TableModel model = new InvestmentTableModel(30, 5, 10);

JTable table = new JTable(model);

add(new JScrollPane(table));

pack();

}

/**

* This table model computes the cell entries each time they are requested. The table contents shows

* the growth of an investment for a number of years under different interest rates.

class InvestmentTableModel extends AbstractTableModel

{

private static double INITIAL_BALANCE = 100000.0;

private int years;

private int minRate;

private int maxRate;

/**

* Constructs an investment table model.

* @param y the number of years

* @param r1 the lowest interest rate to tabulate

* @param r2 the highest interest rate to tabulate

public InvestmentTableModel(int y, int r1, int r2)

{

years = y;

minRate = r1;

maxRate = r2;

}

public int getRowCount()

{

return years;

}

public int getColumnCount()

{

return maxRate - minRate + 1;

}

public Object getValueAt(int r, int c)

{

double rate = (c + minRate) / 100.0;

int nperiods = r;

double futureBalance = INITIAL_BALANCE * Math.pow(1 + rate, nperiods);

return String.format("%.2f", futureBalance);

}

public String getColumnName(int c)

{

return (c + minRate) + "%";

}

Java/CoreJava/v2ch06/tableModel/InvestmentTable.java at master · mthli/Java · GitHub

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