不同利率投资的增长

package test;

import java.text.*;

public class CompoundInterest {

	public static void main(String[] args) {
		final int STARTRATES = 10;
		final int NRATES = 6;
		final int NYEARS = 10;
		
		//set interest rates to 10 ... 15%
		double[] interestRate = new double[NRATES];
		for (int i = 0; i < interestRate.length; i++)
		{
			interestRate[i] = (STARTRATES + i) / 100.0;
		}
		
		double[][] balance = new double[NYEARS][NRATES];
		
		//set initial balance(结余)to 1000 
		for (int j = 0; j < balance[0].length; j++)
		{
			balance[0][j] = 10000;
		}
		
		//compute interest for future years
		for (int i = 1; i < balance.length; i++)
		{
			for (int j = 0; j < balance[i].length; j++)
			{
				//get last year's balance from previous row
				double oldBalance = balance[i-1][j];
				
				//compute interest
				double interest = oldBalance * interestRate[j];
				
				//compute this year's balance
				balance[i][j] = oldBalance + interest;
			}
		}
		
	
		// print one row of interest rates
		
		NumberFormat formatter = NumberFormat.getPercentInstance();
		
		for (int j=0; j < interestRate.length; j++)
		{
			System.out.print("	");
			System.out.print(formatter.format(interestRate[j]) + "	");
		}
		System.out.println();
		
		//print balance table
		
		formatter = NumberFormat.getCurrencyInstance();
	    for (int i=0; i< balance.length; i++)
	    {
	    	//print table row
	    	for (int j=0; j < balance[i].length; j++)
	    	{
	    		System.out.print("	");
	    		System.out.print(formatter.format(balance[i][j]));
	    	}
	    	System.out.println();
	    }
	}
}

   输出结果：

	10%		11%		12%		13%		14%		15%	
	￥10,000.00	￥10,000.00	￥10,000.00	￥10,000.00	￥10,000.00	￥10,000.00
	￥11,000.00	￥11,100.00	￥11,200.00	￥11,300.00	￥11,400.00	￥11,500.00
	￥12,100.00	￥12,321.00	￥12,544.00	￥12,769.00	￥12,996.00	￥13,225.00
	￥13,310.00	￥13,676.31	￥14,049.28	￥14,428.97	￥14,815.44	￥15,208.75
	￥14,641.00	￥15,180.70	￥15,735.19	￥16,304.74	￥16,889.60	￥17,490.06
	￥16,105.10	￥16,850.58	￥17,623.42	￥18,424.35	￥19,254.15	￥20,113.57
	￥17,715.61	￥18,704.15	￥19,738.23	￥20,819.52	￥21,949.73	￥23,130.61
	￥19,487.17	￥20,761.60	￥22,106.81	￥23,526.05	￥25,022.69	￥26,600.20
	￥21,435.89	￥23,045.38	￥24,759.63	￥26,584.44	￥28,525.86	￥30,590.23
	￥23,579.48	￥25,580.37	￥27,730.79	￥30,040.42	￥32,519.49	￥35,178.76