Example of Comparator and IO

Author: jsimas

src/part4io/Comparator.java

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+package part4io;
+
+class Person {
+	String lastName;
+
+	public String getLastName() {
+		return lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+}
+
+public class Comparator {
+
+	public static void main(String[] args) {
+		java.util.Comparator<Person> c = java.util.Comparator.comparing(Person::getLastName);
+		//.thenComparing(Person::getFirstName)
+		
+		//c.reversed(); Reversed
+		
+	}
+}

src/part4io/ExploringDirectories.java

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+package part4io;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+public class ExploringDirectories {
+
+	public static void main(String[] args) throws IOException {
+		Path p = Paths.get("c:", "Vodafone");
+		
+		
+		try(Stream<Path> s = Files.list(p)) {
+			s.filter(path -> path.toFile().isDirectory()).forEach(System.out::println);
+		}
+		
+		try(Stream<Path> s = Files.walk(p, 2)) {
+			s.filter(path -> path.toFile().isDirectory()).forEach(System.out::println);
+		}
+	}
+}

src/part4io/ReadingTextFiles.java

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+package part4io;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+public class ReadingTextFiles {
+
+	public static void main(String[] args) throws IOException {
+		Path path = Paths.get("d:", "tmp", "file.txt");
+		
+		try(Stream<String> s = Files.lines(path)) {
+			s.filter(line -> line.contains("ERROR")).findFirst().ifPresent(System.out::println);
+		}
+	}
+}