[Java 8] – Lambdas expressions

Why should you care about this?

It’s better to programming, it resolves the problems in a easy way, it easy to understand ,it is more clear and more flexible .

Before lambida expressions :

Comparator byMyObjectAttribute = new Comparator(MyObject)(){
     public int compare(MyObject o1, MyObject o2){
        return o1.getMyAttribute().compareTo(o2.getMyAttribute());
    }
}

 After :

Comparator byMyObjectAttribute = (MyObject o1, MyObject o2) -> 
        o1.getMyAttribute().compareTo(o2.getMyAttribute());

Reminder :

• A boolean expressions :

(List list) -> list.isEmpty();

• Creating Objects :

() -> new MyObject()

• Take values for objects

(String s) -> s.length()

• Combine to values

(int a, int b) -> a*b

• Combine to objects

(MyObject o1, MyObject o2) -> 
o1.getMyAttribute().compareTo(o2.getMyAttribute());