Big Data Day 10th

1, remove (int index); //Delete the element at the specified position

2, remove (Object o); //Delete the specified object and examine the rules for deleting objects?

3, RemoveAll (Collection col);//delete all elements in the specified collection.

4, contains (Object O); //Whether it contains

5, contains (Collection col);//Whether the collection is included.

Package It18zhang;

Import java.util.ArrayList;

Import java.util.List;

/*

* 1, remove (int index);//delete the element at the specified position

2. Remove (object o);//delete the specified object, what is the rule that examines the object being deleted?

3, RemoveAll (Collection col);//delete all elements in the specified collection.

4, contains (Object o);//Whether it contains

5, contains (Collection col);//Whether the collection is included.

*/

public class Removedemo {

public static void Main (string[] args) {

TODO auto-generated Method Stub

List<student> list=new arraylist<student> ();

Student s1=new Student ("S1", 10);

Student s2=new Student ("S2", 11);

Student s3=new Student ("S3", 11);

Student s4=new Student ("S4", 12);

System.out.println ("Add objects via Add");

List.add (S1);

List.add (S2);

List.add (S3);

List.add (S4);

GetList (list);

System.out.println ("Delete object with remove");

List.remove (S1);

List.remove (S2);

GetList (list);

System.out.println ("Delete all objects by RemoveAll");

List.removeall (list);

GetList (list);

System.out.println ("by obtain to determine whether to include");

System.out.println ("contains S1" +list.contains (S1));

System.out.println ("contains S4" +list.contains (S4));

System.out.println ("If the Obtainall contains a list");

System.out.println ("contains" +list.containsall (list));

}

private static void GetList (List<student> List) {

TODO auto-generated Method Stub

for (int i=0;i<list.size (); i++) {

Student S=list.get (i);

System.out.println ("This is the first" +i+ "Student" +s.getname () +s.getage ());

}

}

}

Class student{

private int age;

private String name;

Public Student (String name, int.) {

TODO auto-generated Constructor stub

This.name=name;

This.age=age;

}

public int getage () {

return age;

}

public void Setage (int.) {

This.age = age;

}

Public String GetName () {

return name;

}

public void SetName (String name) {

THIS.name = name;

}

}

Big Data Day 10th