代码功能：

给出本金，计算在不同的年复合利率下不同经过年数(期数)对应的本息和。

代码：

package v1ch03.CompoundInterest;

/**

* This program shows how to store tabular data in a 2D array.

* @version 1.40 2004-02-10

* @author Cay Horstmann

*/

public class CompoundInterest

{

public static void main(String[] args)

{

final double STARTRATE = 10;

final int NRATES = 6;

final int NYEARS = 10;

// set interest rates to 10 . . . 15%

double[] interestRate = new double[NRATES];

for (int j = 0; j < interestRate.length; j++)

interestRate[j] = (STARTRATE + j) / 100.0;

double[][] balances = new double[NYEARS][NRATES];

// set initial balances to 10000

for (int j = 0; j < balances[0].length; j++)

balances[0][j] = 10000;

// compute interest for future years

for (int i = 1; i < balances.length; i++)

{

for (int j = 0; j < balances[i].length; j++)

{

// get last year's balances from previous row

double oldBalance = balances[i - 1][j];

// compute interest

double interest = oldBalance * interestRate[j];

// compute this year's balances

balances[i][j] = oldBalance + interest;

}

}

// print one row of interest rates

for (int j = 0; j < interestRate.length; j++)

System.out.printf("%9.0f%%", 100 * interestRate[j]);

System.out.println();

// print balance table

for (double[] row : balances)

{

// print table row

for (double b : row)

System.out.printf("%10.2f", b);

System.out.println();

}

}

}

运行结果：

10%       11%       12%       13%       14%       15%

10000.00  10000.00  10000.00  10000.00  10000.00  10000.00

11000.00  11100.00  11200.00  11300.00  11400.00  11500.00

12100.00  12321.00  12544.00  12769.00  12996.00  13225.00

13310.00  13676.31  14049.28  14428.97  14815.44  15208.75

14641.00  15180.70  15735.19  16304.74  16889.60  17490.06

16105.10  16850.58  17623.42  18424.35  19254.15  20113.57

17715.61  18704.15  19738.23  20819.52  21949.73  23130.61

19487.17  20761.60  22106.81  23526.05  25022.69  26600.20

21435.89  23045.38  24759.63  26584.44  28525.86  30590.23

23579.48  25580.37  27730.79  30040.42  32519.49  35178.76

在Excel中绘制图表如下：