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// files/AddAndSubtractPaths.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.nio.file.*;

import java.io.IOException;

public class AddAndSubtractPaths {

static Path base = Paths.get("..", "..", "..")

.toAbsolutePath()

.normalize();

static void show(int id, Path result) {

if(result.isAbsolute())

System.out.println("(" + id + ")r " +

base.relativize(result));

else

System.out.println("(" + id + ") " + result);

try {

System.out.println("RealPath: "

+ result.toRealPath());

} catch(IOException e) {

System.out.println(e);

}

}

public static void main(String[] args) {

System.out.println(System.getProperty("os.name"));

System.out.println(base);

Path p = Paths.get("AddAndSubtractPaths.java")

.toAbsolutePath();

show(1, p);

Path convoluted = p.getParent().getParent()

.resolve("strings")

.resolve("..")

.resolve(p.getParent().getFileName());

show(2, convoluted);

show(3, convoluted.normalize());

Path p2 = Paths.get("..", "..");

show(4, p2);

show(5, p2.normalize());

show(6, p2.toAbsolutePath().normalize());

Path p3 = Paths.get(".").toAbsolutePath();

Path p4 = p3.resolve(p2);

show(7, p4);

show(8, p4.normalize());

Path p5 = Paths.get("").toAbsolutePath();

show(9, p5);

show(10, p5.resolveSibling("strings"));

show(11, Paths.get("nonexistent"));

}

}

/* Output:

Windows 8.1

C:\Git

(1)r OnJava8\ExtractedExamples\files\AddAndSubtractPath

s.java

RealPath: C:\Git\OnJava8\ExtractedExamples\files\AddAnd

SubtractPaths.java

(2)r OnJava8\ExtractedExamples\strings\..\files

RealPath: C:\Git\OnJava8\ExtractedExamples\files

(3)r OnJava8\ExtractedExamples\files

RealPath: C:\Git\OnJava8\ExtractedExamples\files

(4) ..\..

RealPath: C:\Git\OnJava8

(5) ..\..

RealPath: C:\Git\OnJava8

(6)r OnJava8

RealPath: C:\Git\OnJava8

(7)r OnJava8\ExtractedExamples\files\.\..\..

RealPath: C:\Git\OnJava8

(8)r OnJava8

RealPath: C:\Git\OnJava8

(9)r OnJava8\ExtractedExamples\files

RealPath: C:\Git\OnJava8\ExtractedExamples\files

(10)r OnJava8\ExtractedExamples\strings

RealPath: C:\Git\OnJava8\ExtractedExamples\strings

(11) nonexistent

java.nio.file.NoSuchFileException:

C:\Git\OnJava8\ExtractedExamples\files\nonexistent

*/