I have one query that is I am using eclipse and I have imported the project and as usual in a project there are 30 to 40 packages and each package contains set of classes , Now say in package named A I have a class Named abc and in later subpackages ,let say in package named W i have extended and override some of the methods of that class(abc) and construct a new class named def which extend the parent class abc, now please let me let me know I have opened the parent class abc in eclipse is there any shortcut through which I can find out which subclasses in later package overrides it's method and which subclasses are extending it..!
Yes: When your cursor is on the class name (as in: public class A|bc), you can press Ctrl+T to see the inheritance hierarchy of Abc.
If you press CTRL-T twice, it will show you the supertype hierarchy, which also includes any Interfaces that your class implements. Occasionally very useful.
Also,
Right click on the file in the project explorer -> Open type hierarchy.
Same works for right click on the class name in editor window.
Shortcut is F4.
Also, apart from worthy shortcut that Aaron posted, you can also do this: -
Go to Windows -> Show Views -> Open Outline view (If not found - go to Others)
It will open an Outline View which shows your class hierarchy of your current class
Related
In Xcode, there is a function where if I want to see the part of my class that is accessible to the public, I would simply press a button named "generate interface" and it will show a screen that only contain variable names and method names that are declared public without actually create a new file containing those variables and methods.
I was just wondering if there is a similar function in NetBeans for Java class?
There is a Navigator window that displays all the class variables. You can use filters to display only what you want.
Check the following link: Navigator
Clicking "F3" on the Change class in eclipse,
Change change = refactoring.createChange(monitor);
I could open the Class.java.
public abstract class Change implements IAdaptable {
...
However, I need the concrete Java classes that implements the Change class. How can I find them in eclipse?
You can use the shortcut Ctrl + T to see all implementations of the class.
Go to Windows -> Open the Outline View -> Right click on the
required class -> Select Open Type Hierarchy.
This will open the window with the hierarchy involving that class.
I am using Eclipse IDE 3.6 version .
Inside my code i have a method as
public APIRes execute(APIReq request) throws Exception {
// Some code
}
Could you please tell me , when i did open Call Hierarchy , nothing is shown .
Why is it so ??
The obvious solution is that there may be nothing calling that method - at least within the code that Eclipse knows about. Beyond that, we really can't say...
Maybe the problem is that Open Call Hierarchy was not searching the entire Workspace.
Click on the small down arrow (in the Call Hierarchy view window on the right; it is the "View Menu" arrow -- a triangle pointing down) in Call Hierarchy view, set the Search Scope > Workspace.
Do you mean Call Hierarchy or Class Referencing.
If your create a method and nobody calls it, what do you expect to see in the call hierarchy.
Your method is referencing the class in which the method is placed. This would be shown in the reference view.
first clear the project and refresh it and select the method press right click open call hierarchy you will get the class where method declaration is defined.
Can one search by the implementation or its methods in eclipse? It would be really useful.
An example is given below.
public interface Foo {
public void method();
}
public class FooImpl implements Foo {
// I should be able to select this and search and it should
// show the whoever called Foo.method
public void method() {
}
}
If you see a method, called from interface, then just position mouse cursor over it, press ctrl and you see menu with options "Open Declaration | Open Implementation". In your case press "Open Implementation".
In case this method is implemented by many classes you will get a popup with "Types implementing or defining...". Quite nice feature :)
UPDATE: according to your example... If I understood it right, then when you select method, press ctrl+shift+G and you see all places where this method is called.
Select "Foo" in the editor -> right-click -> Open Type Hierarchy (or F4). The "Type Hierarchy" View will open -> On this View, click the icon for the function "Show the Sub-Type Hierarchy" (or "Show All Inherited Members").
Eclipse will show all the Child classes.
Another method is mentioned in this post. Instead of using CTRL+H or CTRL+SHIFT+G you can use CTRL+T to open a pop-up in place instead of a new Eclipse tab as the other methods do.
You can use default search option. Access it by pressing CTRL+H. Go to Java search tab. Here you can write method name and search for it.
Is there any way by which I can find out all classes which implement a particular interface?
For example, if I have a interface as follows:
public interface myIntFac{}
I want to find all classes inside current project that implement this interface. How can I find it out in Eclipse?
At the interface level, you can use (assuming the cursor in on the interface)
CTRL+T to show the Quick Type Hierarchy
F4 to Open Type Hierarchy
At the method level, if you hover a method while holding down the control key, a pop-up box gives you the following choices:
Open Declaration
Open Implementation
(source: eclipse.org)
And from anywhere, you can use:
CTRL+SHIFT+H to open the Open Type Hierarchy pop-up and search for any type/interface.
Place your cursor on the interface, and try Ctrl-T.
Put your cursor in myIntFac and press F4 to show the type hierarchy as a separate window, or Ctrl-T to show it as a pop-up. Personally I like the "separate window" approach as it makes it easier to browse, refocus on a different type etc - but if you only want to show the hierarchy very briefly, the pop-up is good too.