浮点运算不能产生精确的结果

I need to do some floating point arithmetic in Java as shown in the code below:

public class TestMain {
    private static Map<Integer, Double> ccc = new HashMap<Integer, Double>() {
      { put(1, 0.01); put(2, 0.02); put(3, 0.05); put(4, 0.1); put(6, 0.2);
        put(10, 0.5); put(20, 1.0); put(30, 2.0); put(50, 5.0); put(100, 10.0);
      }
    };

    Double increment(Double i, boolean up) {
        Double inc = null;

        while (inc == null) {
            inc = ccc.get(i.intValue());

            if (up)
                --i;
            else
                ++i;
        }
        return inc;
    }

    public static void main(String[] args) {
        TestMain tt = new TestMain();

        for (double i = 1; i < 1000; i += tt.increment(i, true)) {
            System.out.print(i + ",");
        }
    }
}

这是为了模拟 Betfair 输出的值范围微调器小部件.

Java 中的浮点运算似乎引入了一些意想不到的错误.例如，我得到 2.180000000000001 而不是 2.18.浮点数有什么用，你不能相信对它们执行的算术结果?我该如何解决这个问题?