集合框架LIST

package list;


public class course {
int ID;
String name;
public course(int Id,String Name)
{
this.ID=Id;
this.name=Name;
}

}

/////////////

package list;


import java.util.ArrayList;
import java.util.List;


public class student {
     public List <course>li;
     public student()
     {
    this.li=new ArrayList<course>();
     }
     public void add()//不可以在主函数使用
     {
    course C1=new course(1,"语文");
    course C2=new course(2,"数学");
    course C3=new course(3,"英语");
    li.add(C1);
    li.add(C2);
    li.add(C3);
    //shan
    li.remove(1);
           //change
    li.set(0,new course(1,"高等英语"));
    //cha
    for(course cc:li)
    {
        System.out.println(cc.ID+""+cc.name);
    } 
     }
     public void context()
     {
    //是否含有对象
    course C1=li.get(1);
    System.out.println(li.contains(C1));
    if(li.contains(C1))
    {
    System.out.println("位置"+li.indexOf(C1)
    );
    }
      course C7=new course(1,"英语");
    //判断
    for(course cc:li)
    {
    if(cc.name.equals(C7.name))
    {
    System.out.println("含有英语-");
    }
    } 
     }
     public static void main(String []Args)
     {
         
        student s1=new student();
        s1.add();
        s1.context();
        
     }
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((li == null) ? 0 : li.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
student other = (student) obj;
if (li == null) {
if (other.li != null)
return false;
} else if (!li.equals(other.li))
return false;
return true;
}
     
}