兩個double類型的值比大小

package wxText;

import java.math.BigDecimal;

public class DoubleDemo {
    
      public String compare(BigDecimal val1, BigDecimal val2) {  
            String result = "";  
            if (val1.compareTo(val2) < 0) {  
                result = "第二位數大！";  
            }  
            if (val1.compareTo(val2) == 0) {  
                result = "兩位數一樣大！";  
            }  
            if (val1.compareTo(val2) > 0) {  
                result = "第一位數大！";  
            }  
            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));  
    }

}