Java – How to find pdf is portrait or landscape using PDFBOX Library in Java

javapdfpdfbox

I am doing project in Java using PDFBOX-1.8.6 library (its compulsory to use).
My Question is

How can I check input pdf file have portrait or landscape orientation ?
How to check/scan portrait or landscape orientation in PDF by its dimensions of each page if both are same? For example, both are in standard A4 size.
You will be more clear by below picture.
my Landscape – Portrait problem
I just want to check its content is rotated or not. So How can I cope up with above problem ?

Best Answer

Assuming that you have a PDPage object:

PDRectangle mediaBox = page.findMediaBox();
boolean isLandscape = mediaBox.getWidth() > mediaBox.getHeight();

however... the page could be rotated:

int rotation = page.findRotation();
if (rotation == 90 || rotation == 270)
    isLandscape = !isLandscape;

This is for 1.8.* only. In the 2.* versions, use getMediaBox() and getRotation(). Don't use the get* methods in the 1.8.* versions because they don't look up the page tree if the info is missing at the page level.

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Java – How to efficiently iterate over each entry in a Java Map

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
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On Java 10+:

for (var entry : map.entrySet()) {
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Java – How to call one constructor from another in Java

Yes, it is possible:

public class Foo {
    private int x;

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To chain to a particular superclass constructor instead of one in the same class, use super instead of this. Note that you can only chain to one constructor, and it has to be the first statement in your constructor body.

See also this related question, which is about C# but where the same principles apply.

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