java8-tutorial/src/com/winterbe/java8/samples/misc/Files1.java at master · sai43/java8-tutorial · GitHub

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package com.winterbe.java8.samples.misc;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

import java.util.stream.Collectors;

import java.util.stream.Stream;

/**

* @author Benjamin Winterberg

public class Files1 {

public static void main(String[] args) throws IOException {

testWalk();

testFind();

testList();

testLines();

testReader();

testWriter();

testReadWriteLines();

testReaderLines();

}

private static void testReaderLines() throws IOException {

Path path = Paths.get("res/nashorn1.js");

try (BufferedReader reader = Files.newBufferedReader(path)) {

long countPrints = reader

.lines()

.filter(line -> line.contains("print"))

.count();

System.out.println(countPrints);

}

private static void testWriter() throws IOException {

Path path = Paths.get("res/output.js");

try (BufferedWriter writer = Files.newBufferedWriter(path)) {

writer.write("print('Hello World');");

}

private static void testReader() throws IOException {

Path path = Paths.get("res/nashorn1.js");

try (BufferedReader reader = Files.newBufferedReader(path)) {

System.out.println(reader.readLine());

}

private static void testWalk() throws IOException {

Path start = Paths.get("");

int maxDepth = 5;

try (Stream<Path> stream = Files.walk(start, maxDepth)) {

String joined = stream

.map(String::valueOf)

.filter(path -> path.endsWith(".js"))

.collect(Collectors.joining("; "));

System.out.println("walk(): " + joined);

}

private static void testFind() throws IOException {

Path start = Paths.get("");

int maxDepth = 5;

try (Stream<Path> stream = Files.find(start, maxDepth, (path, attr) ->

String.valueOf(path).endsWith(".js"))) {

String joined = stream

.sorted()

.map(String::valueOf)

.collect(Collectors.joining("; "));

System.out.println("find(): " + joined);

}

private static void testList() throws IOException {

try (Stream<Path> stream = Files.list(Paths.get(""))) {

String joined = stream

.map(String::valueOf)

.filter(path -> !path.startsWith("."))

.sorted()

.collect(Collectors.joining("; "));

System.out.println("list(): " + joined);

}

private static void testLines() throws IOException {

try (Stream<String> stream = Files.lines(Paths.get("res/nashorn1.js"))) {

stream

.filter(line -> line.contains("print"))

.map(String::trim)

.forEach(System.out::println);

}

private static void testReadWriteLines() throws IOException {

List<String> lines = Files.readAllLines(Paths.get("res/nashorn1.js"));

lines.add("print('foobar');");

Files.write(Paths.get("res", "nashorn1-modified.js"), lines);

}

java8-tutorial/src/com/winterbe/java8/samples/misc/Files1.java at master · sai43/java8-tutorial · GitHub

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