Java 8 Collection Example with forEach(), removeIf(), replaceAll() and sort()

It's known that Java 8 brought a lot of new features that is improved Java language writing scalability.  Today we look through one of them, that is, java List collection new methods. Let's take a look through some examples below.

forEach()

Syntax of forEach() method.

forEach(Consumer<? super T> action)

ForEachDemo.java

    
  public class ForEachDemo {
     public static void main(String[] args) {
      List<Person> list = new ArrayList<>();     
      list.add(new Person(1, "Bob"));
      list.add(new Person(2, "Tom"));
      list.add(new Person(3, "Kate"));  
      Consumer<Person> style = 
         (Person p) -> System.out.println("id:"+p.getPid() +", Name:"+p.getName());
      list.forEach(style);
    }
}

removeIf()

removeIf(Predicate<? super E> filter) 
It removes all the elements from the List which satisfies the given Predicate. 
RemoveIfDemo.java

import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Predicate;
public class RemoveIfDemo {
    public static void main(String[] args) {
             List<Person> list = new ArrayList<>();     
  list.add(new Person(1, "Mahesh"));
  list.add(new Person(2, "Ram"));
  list.add(new Person(3, "Krishna"));  
  Consumer<Person> style = (Person p) -> System.out.println("id:"+p.getPid() +", Name:"+p.getName());  
  System.out.println("---Before delete---");
  list.forEach(style);
  int pid = 2;
             Predicate<Person> personPredicate = p-> p.getPid() == pid;
         list.removeIf(personPredicate);
  System.out.println("---After delete---");     
         list.forEach(style);
 }
}