写一个人类，有成员用java写属性:姓名、年龄、性别，有两个成员方法

public class Person {
private String name;
private int age;
private String gender;

public Person(String name, int age, String gender) {
this.name = name;
this.age = age;
this.gender = gender;
}

public void introduce() {
System.out.println("My name is " + name + ", I am " + age + " years old, and I am " + gender + ".");
}

public void haveBirthday() {
age++;
System.out.println("Happy birthday to me! I am now " + age + " years old.");
}
}