diff --git a/docs/java/basis/java-basic-questions-01.md b/docs/java/basis/java-basic-questions-01.md
index 3e510212..de037a3a 100644
--- a/docs/java/basis/java-basic-questions-01.md
+++ b/docs/java/basis/java-basic-questions-01.md
@@ -662,15 +662,18 @@ System.out.println(a == b);// false
 
 ```java
 BigDecimal a = new BigDecimal("1.0");
-BigDecimal b = new BigDecimal("0.9");
+BigDecimal b = new BigDecimal("1.00");
 BigDecimal c = new BigDecimal("0.8");
 
-BigDecimal x = a.subtract(b);
+BigDecimal x = a.subtract(c);
 BigDecimal y = b.subtract(c);
 
-System.out.println(x); /* 0.1 */
-System.out.println(y); /* 0.1 */
-System.out.println(Objects.equals(x, y)); /* true */
+System.out.println(x); /* 0.2 */
+System.out.println(y); /* 0.20 */
+// 比较内容，不是比较值
+System.out.println(Objects.equals(x, y)); /* false */
+// 比较值相等用相等compareTo，相等返回0
+System.out.println(0 == x.compareTo(y)); /* true */
 ```
 
 关于 `BigDecimal` 的详细介绍，可以看看我写的这篇文章：[BigDecimal 详解](https://javaguide.cn/java/basis/bigdecimal.html)。