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How to transform stream elements using map in Java 8 by Example
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package com.learnbyexamples.streams;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class E007_TransformStreamUsingMap {
    public static void main(String[] args) {
        //List of names
        List<String> names = new ArrayList<>();
        names.add("JOHN");
        names.add("PETER");
        names.add("SHIVA");
        
        //Transform all strings into lowercase
        List<String> lowerNames = names.stream().map(String::toLowerCase).collect(Collectors.toList());
        
        //Prints the list
        System.out.println(lowerNames);
    }
}
Output
[john, peter, shiva]
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