```java
public class TestPerson{
public static void main(String[]args){
//想使用一个类,必须(1)先创建类的对象
Person per=new Person();//类是对象的类型,per的类型是Person
//(2)对象名.属性
per.name="Zhang San";
per.age=20;
per.sex="Male";
//(3)对象名.方法名()
per.introduce();
public class Person{
String name;
int age;
String sex;
public void introduce(){
System.out.println("name:"+name+"\t age:"+"\sex:"+sex);
}
}
}
}
//*TestPerson.java:11: error: illegal start of expression
public class Person{
^
TestPerson.java:20: error: class, interface, enum, or record expected
}
^
2 errors */
```