两个double类型的值比大小

package wxText;  import java.math.BigDecimal;  public class DoubleDemo {            public String compare(BigDecimal val1, BigDecimal val2) {               String result = "";               if (val1.compareTo(val2) < 0) {                   result = "第二位数大！";               }               if (val1.compareTo(val2) == 0) {                   result = "两位数一样大！";               }               if (val1.compareTo(val2) > 0) {                   result = "第一位数大！";               }               return result;           }        public static void main(String[] args) {             double a = 0.01;               double b = 0.01;               BigDecimal data1 = new BigDecimal(a);               BigDecimal data2 = new BigDecimal(b);               System.out.print(new DoubleDemo().compare(data1, data2));       }  }