Java Eclipse Tutorial – Part 4.2: Searching and Navigating Source Code

Java Eclipse Tutorial – Part 4.2: Searching and Navigating Source Code

Hi, this is Chad (shod) for
Welcome back to another tutorial on Eclipse. In this video you will learn how to use Eclipse
to navigate and search through your source code. We’ll cover the following topics. You’ll
learn how to search and find code, you’ll also learn how to find references for a class
or method, we’ll also discuss how to open a method declaration, and finally, you’ll
learn how to view the call stack. Let’s get started. A common thing you need
to do whenever you’re using job or development is searching for strings or searching for
text. Eclipse allows you to search by simply using the CTRL + F feature, and this brings
up the find and replace window. You can type in whatever text that you want to search for
and Eclipse will go through and find it. You can set various options, case sensitive, whole
word, and this works like a normal text editor. I’m searching for demo and I’m going to
just walk through and it’ll show me all instances for demo in this actual file. If you want
to make use of replace you can say, “Replace the word demo with foobar and then go through
and do replace find or replace all, and again, it works like a normal text editor. Also, when you have a large code base you
may need to search for text in other files. Other than just a local file you need to search
all of the files in your project. Eclipse offers a very robust search mechanism. You
can search for plain text or Java specific constructs. To open the search item, select
Search, Search. If you can see this brings up the search dialog. This search dialog has
a lot of information. Let’s go through it one piece at a time. There is a file search where you can search
for plain text across multiple files, you can give the actual text you’re searching
and the file name pattern. You can also search for task that are available in Mylyn. Mylyn
is a to-do list or task list item. There is also a Git search. Git is a repository or
version control system and it can search against a repo. There is also the Java search, where
you can search for a specific Java constructs like types, packages or fields, that is our
constructors. All right. Let’s try out the Java search.
In this example, I want to search for a class that makes use of the J button class. I’ll
set the type here, and I’ll say the string I’m searching for is JButton, and that’s
the actual type. I’m searching for the JButton that’s used in all of the files within this
project. I hit search and at the bottom it gives me the search results. It’ll show you
all of the files that are making use of JButton and you can easily expand and explore and
drill down and get the actual details for it. All right. Another thing I want to do here
is I actually want to search by method name. I want to find methods that begin with a certain
string. We, here I’ll just pull this down a bit. I’ll go back to my search and I’ll
choose the search again. This will bring up the search window. I have the Java search.
I’m going to search for an actual method name and I’m going to find a method name that starts
with create. I’ll say, create star. I’m going to use
the wild card to match on any string and then I’ll hit search. At the bottom it will give
me a list again, of all the methods, I’m sorry, all of the classes or files that have a method
called create inside of it. So I can go through and I’ll see the match there. I’m going
down some more, and I’ll see more matches. You may see other methods here referenced.
It means that these methods actually use the create method inside of it. If I double click
on one of these I’m going to go in and see that this method is using a create call accordingly.
It’s just a very nice way of going through and finding all methods that have the name
create or calls to methods with a name create. The next feature will cover is how to navigate
the Java source code as far as drilling down into an actual method. Let’s say for example,
you have a line of code and here we have this J panel, p1 equals create vertical panel.
There is some method that’s going to execute and create this panel for us. What exactly
does this method do? We can actually open the declaration for the method and find out
the actual internal details, so I can highlight this file, I’m sorry, highlight this method.
Right click, say, Open Declaration. It’ll take me to the actual coding for this method.
It’s just a very nice feature to navigate the code by looking at the actual declaration
for a given method. Another nice feature is that, as you’re moving
through your code you may find a given method, and you want to find out who is calling that
actual method. We can actually find the references for a method. What I’ll do is I’ll move up
here, I’ll find this method called create horizontal panel. This is a method to finding
the class but who is calling this method? I can find the references by right clicking,
going to Reference, Work Space, and this will show us all of the references, basically who
is calling this method in this given work space. At the bottom we’ll have search results.
We have seven references. It’ll show us the actual methods and we can double click those
items and go directly to the code and see how this actual method is being called. One last feature that is very useful in navigating
a code base is the call hierarchy. This basically gives you the sequence of method calls that
are made for a given method. You can find the call hierarchy simply right clicking a
method and saying, Open, Call Hierarchy. This will give you the actual results here and
if you expand all of the nodes then you’ll eventually see the main method. Basically,
the step through it you have the main method that makes a call to this constructor which
in turn makes a call to add checkboxes. This wraps up our discussion. In this video
you learned how to use Eclipse to navigate and search through your source code. Please
subscribe through our channel to view more videos on Eclipse and Java. Also, visit our
website to download Java source code.

7 thoughts on “Java Eclipse Tutorial – Part 4.2: Searching and Navigating Source Code

  1. i searched on yt this : how to open find/replace windows eclipse
    and i found this vid here , i thought , mhhhhh not rly helpfuñ , until i seed the entire vid, and i was like '-' AWESOME
    thx dude it helpd a lottt

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