java访问变量有就近原则(优先查找所在方法的参数,在查找类),this关键字解决“就近原则问题”,this.代表类,类似于Python的self,可以使用各种方法,不限制在构造函数
public class Students {,
int age;String name;
public Students(String name,int age){this.name=name;this.age=age;}
public static void main(String[] args) {
Students s1 =new Students("zhang",211); System.out.print(s1.age + s1.name);
}