fix class == comparasion

michaelliao · Nov 4, 2024 · b75f3e7 · b75f3e7
1 parent f1c79dd
commit b75f3e7
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/source/books/java/50-reflection/10-class/README.md b/source/books/java/50-reflection/10-class/README.md
@@ -118,7 +118,9 @@ boolean b1 = n instanceof Integer; // true，因为n是Integer类型
 boolean b2 = n instanceof Number; // true，因为n是Number类型的子类
 
 boolean b3 = n.getClass() == Integer.class; // true，因为n.getClass()返回Integer.class
-boolean b4 = n.getClass() == Number.class; // false，因为Integer.class!=Number.class
+Class c1 = n.getClass();
+Class c2 = Number.class;
+boolean b4 = c1 == c2; // false，因为Integer.class != Number.class
 ```
 
 用`instanceof`不但匹配指定类型，还匹配指定类型的子类。而用`==`判断`class`实例可以精确地判断数据类型，但不能作子类型比较。