區別                                     super                                                                                                                             this

范圍                       是由子類訪問父類的內容                                                                                            是直接訪問本類中的內容

訪問屬性             super.父類屬性，如果屬性沒有被覆寫，則也可以                                    this本類屬性
                                 不寫super
          
訪問方法            super.父類方法(),如果方法沒有被覆寫，則可以                                       this.本類方法(),可以不寫this,也表示調用本類的
                                不用 加super也表示調用父類中的方法
                               
訪問構造           super是訪問父類中的構造方法，必須放在首行                                            this 是訪問本類中的其他構造，必須放在首行


比如：
class People{
    String name;
    int age;
    public People(String name,int age){
        this.name=name;
        this.age=age;
    } 
    public String fun(){
       return ""+name+age;
    }
 }
class Student extends People{
    String school;
    public Student(String name,int age,String school){
        super(name,age);
        this.school=school;
    }
   public void print(){
        System.out.println(fun()+this.school);
    }

}
public class Demo(){
public ststic void main(String[] args){
    Student s = new Student("Lucy",21,"理工");
    s.print();
    }
}