LambdaExpression, Java

LambdaExpression

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    
    static String StringOp(StringFunc sf,String s){
       return sf.func(s);
    }
    
    public static void main(String args[])
    {
        
        String inStr = "Lambdas add power to Java programming";
        String outStr;
        
        System.out.println("Here is input string: "+inStr);
        outStr = StringOp((str) -> str.toUpperCase(), inStr);
        
        //This passes a block lambda that removes spaces.
        outStr = StringOp((str) -> {
            String result = "";
            int i; 
            for(i=0; i<str.length(); i++){
                if(str.charAt(i) != ' ')
                    result += str.charAt(i);
            }
            
            return result;}, inStr);
        
        
        StringFunc sf = (str) -> {
            String result = "";
            
            for(int i=str.length()-1; i>=0; i--){
                result +=str.charAt(i);
            }
            return result;
        };
                
        System.out.println(StringOp(sf,inStr)); 
        
    }
}

interface StringFunc{
    String func(String n);
}


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