Application of Lamda Expressions in Java

Lamda expressions are primarily intended to address the tedious process of anonymous internal classes

Example: simple LAMDA expression

Anonymous inner class is used here

 PackageCom.java.demo;Interfaceimessage{ Public voidPrint ();//Abstract Methods} Public classtestdemo{ Public Static voidMain (String args[]) {//using the print () method for an anonymous inner classFunNewIMessage () { Public voidprint () {System.out.println ("Hello word");    }        }); }     Public Static voidFun (IMessage msg) {msg.print (); }}

Replace anonymous inner classes with LAMDA expressions

 PackageCom.java.demo;Interfaceimessage{ Public voidPrint ();//Abstract Methods} Public classtestdemo{ Public Static voidMain (String args[]) {//using the print () method for an anonymous inner classFun (()->system.out.print ("Hello word")); }     Public Static voidFun (IMessage msg) {msg.print (); }}

Three forms of the LAMDA expression.

Single-line statement ([parameters])

([parameter])->{multiline line statement}

([parameter])--expression

 PackageCom.java.demo;Interfaceimessage{ Public intPrintintXinty);//Abstract Methods} Public classtestdemo{ Public Static voidMain (String args[]) {IMessage P= (x, y) × + y;//returns the IMessage objectSystem.out.print (P.print (10, 20)); }}

Application of Lamda Expressions in Java