How to compare BigDecimal values ​​in java

1. Using the equals() method not only requires the values ​​of the two BigDecimals to be equal, but also requires their scale() to be equal.

   BigDecimal d1 = new BigDecimal("123.45");
   BigDecimal d2 = new BigDecimal("123.45000");
   System.out.println(d1.equals(d2)); // false,因为scale不同
   System.out.println(d1.equals(d2.stripTrailingZeros())); // true,因为d2去除尾部0后scale变为2,与d1相同

2. Use the compareTo() method to compare the size of two numbers. It returns -1, 1 and 0 respectively according to the size of the two values, indicating less than, greater than and equal to respectively.

    import java.math.BigDecimal;
    public class Demo {
     public static void main(String[] args) {
      BigDecimal d1 = new BigDecimal("123.45");
      BigDecimal d2 = new BigDecimal("123.45000");
      BigDecimal d3 = new BigDecimal("123.40");
      System.out.println(d1.compareTo(d2)); // 0
      System.out.println(d1.compareTo(d3));//  1
      System.out.println(d3.compareTo(d2));// -1
     }
    }

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