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更新Update java-basic-questions-01.md文件对BigDecimal描述，比较值内容应该用compareTo

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@ -662,15 +662,18 @@ System.out.println(a == b);// false
```java ```java
BigDecimal a = new BigDecimal("1.0"); 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 c = new BigDecimal("0.8");
BigDecimal x = a.subtract(b); BigDecimal x = a.subtract(c);
BigDecimal y = b.subtract(c); BigDecimal y = b.subtract(c);
System.out.println(x); /* 0.1 */ System.out.println(x); /* 0.2 */
System.out.println(y); /* 0.1 */ System.out.println(y); /* 0.20 */
System.out.println(Objects.equals(x, y)); /* true */ // 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)。 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)。