Question

We have created an ArrayList of Person class. write a method called push that pushes all the people with the even length last name to the end of the ArrayList

Content of the ArrayList before push

[alex Bus, Mary Phillips, Nik Lambard, Rose Rodd, Esa khan, Jose Martinex, Nik Patte]

content of the ArrayList after the push method
[alex Bus, Nik Lambard, Nik Patte, Mary Phillips, Rose Rodd, Esa khan, Jose Martinex]

import java.util.*;
class Person
{
   private String name;
   private String last;
   public Person(String name, String last)
   {
     this.name = name;
     this.last = last;
   }
   public String getLast()
   {
     return last;
   }
   public String getFirst()
   {
     return name;
   }
   public String toString()
   {
     return name + " " + last;
   }
}

public class ArrayList
{
  public static void main(String[] args)
  {
    ArrayList<Person> list = new ArrayList<Person>();
     list.add(new Person ("alex","Bus"));
     list.add(new Person("Mary", "Phillips"));
     list.add(new Person("Nik", "Lambard") );
     list.add(new Person("Rose","Rodd"));
     list.add(new Person("Esa","khan"));
     list.add(new Person("Jose","Martinex"));
     list.add(new Person("Nik","Patte"));
     System.out.println(list);
     push(list);
     System.out.println(list);

  
  }
//this method pushes all the people with the even length last name to the end of the list
 public static void push(ArrayList<Person> list) {
         
 }
     
   
}

Answer 1

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

class Person {
        private String name;
        private String last;

        public Person(String name, String last) {
                this.name = name;
                this.last = last;
        }

        public String getLast() {
                return last;
        }

        public String getFirst() {
                return name;
        }

        public String toString() {
                return name + " " + last;
        }
}

public class ArrayListDemo {
        public static void main(String[] args) {
                ArrayList<Person> list = new ArrayList<Person>();
                list.add(new Person("alex", "Bus"));
                list.add(new Person("Mary", "Phillips"));
                list.add(new Person("Nik", "Lambard"));
                list.add(new Person("Rose", "Rodd"));
                list.add(new Person("Esa", "khan"));
                list.add(new Person("Jose", "Martinex"));
                list.add(new Person("Nik", "Patte"));
                System.out.println(list);
                push(list);
                System.out.println(list);

        }

//this method pushes all the people with the even length last name to the end of the list
        public static void push(ArrayList<Person> list) {
                int size=list.size();
                for (int i=0;i<size;i++) {
                        if (list.get(i).getLast().length() % 2 == 0) {
                                Person p=list.remove(i);
                                list.add(p);
                        }
                }
        }

}

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