this关键字的应用

package java;public class Student {    String name;    String sex;    int age;    public Student(String name,String sex,int age)    {        this.name=name;        this.sex=sex;        this.age=age;    }    void showInfo()    {        System.out.println("姓名:"+name);        System.out.println("性别:"+sex);        System.out.println("年龄:"+age);    }    public static void main(String[] args) {        // TODO Auto-generated method stub        Student stu=new Student("李四","女",20);        System.out.println("学生的信息");        stu.showInfo();    }}