A example how to use java 8 lambda stream with inputstream and map.

LambdaInputStreamMapExample.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class LambdaInputStreamMapExample {

	public static void main(String[] args) {
		new LambdaInputStreamMapExample().start();
	}

	// Example Input: I'm the real Donald Trump
	// Output: Line: "I'm the real Donald Drumpf"
	private void start() {
		try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
			
			//Get Stream with lines from BufferedReader
			reader.lines()
			//Gives each line as string to the changeTrumpToDrumpf method of this.
			.map(this::changeTrumptoDrumpf)
			//Calls for each line the print method of this.
			.forEach(this::print);
			
		} catch (IOException ioException) {
			ioException.printStackTrace();
		}
	}

	private String changeTrumptoDrumpf(String aLine) {
		// https://en.wikipedia.org/wiki/Donald_Trump_(Last_Week_Tonight)#.22Make_Donald_Drumpf_Again.22
		return aLine.replaceAll("Trump", "Drumpf");
	}

	private void print(String aLine) {
		System.out.println(String.format("Line: \"%s\"", aLine));
	}
}