CODEWITHSUNDEEP
java
user6739736
user6739736

Reputation:

Where can I find the Java packages and the class?

I am learning Java and I have came across few packages like util package, swing package etc. I want to dig it more so my question is when we import any packages in our source code where can I see those packages and the class codes in my personal computer.

Let's say there is an util package and ArrayList class. So where can I find the util package and ArrayList class?

Can I make any changes to ArrayList class or any other class?

I am trying to have the packages and class code without Eclipse installation. I have installed JDK and JRE and running the Java files through command prompt and using Notepad++ for writing code.

Upvotes: 1

Views: 711

Answers (2)

Bibek Shakya
Bibek Shakya

Reputation: 1271

where can I see those packages and the class codes in my personal computer.

Just click control key and right click of mouse at ArrayList Object if u use eclipse or netbeans

if not then you find it here C:\Program Files\Java\jdk1.6.0_11\jre\lib\rt.jar

Can I make any changes to ArrayList class or any other class?

You can't simply.java.util package contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes and is provided by JRE

Upvotes: 1

Elliott Frisch
Elliott Frisch

Reputation: 201537

java.util.ArrayList is provided by the JRE, it is in rt.jar (and you can see the source).

Can I make any changes to ArrayList class or any other class?

You could sub-class ArrayList (or simply implement List), but you can't really alter built-in classes (and even if you could, your code would then not be portable).

Upvotes: 4

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