什么时候可以在Java中使用getClass()方法？
getClass()方法是从对象 类，它返回一个类类的实例。当我们声明一个对象的新实例时，它将引用一个类。每个JVM只能有一个类，但有多个对象引用该类。因此，当我们获得两个对象的类时，它们可能是指同一类。
语法
public final Class<?> getClass()
示例
class User {
private int id;
private String name;
public User(int id, String name) {
this.id = id;
this.name = name;
}
}
class SpecificUser extends User {
private String specificId;
public SpecificUser(String specificId, int id, String name) {
super(id, name);
this.specificId = specificId;
}
}
public class TestUser {
public static void main(String[] args){
User user = new User(115, "Raja");
SpecificUser specificUser = new SpecificUser("AAA", 120, "Adithya");
User anotherSpecificUser = new SpecificUser("BBB", 125, "Jai");
System.out.println(user.getClass());
System.out.println(specificUser.getClass());
System.out.println(anotherSpecificUser.getClass());
}
}输出结果
class User class SpecificUser class SpecificUser