Eclipse IDE – How to generate constructor using fields ?

August 27, 2017 SJ Eclipse IDE 0

In this article, we will discuss how to generate constructor with fields for a Java class

1. Earlier era:

Often for any POJO, writing constructor is very important
Which is used during Object instantiation, thus supplying initial values for object construction
Depending on the business requirement, mentioning different parameterized constructor is also important
Everyone has to write/code different parameterized constructor on plain text file (file name ending with extension .java)

2. IDE era (Eclipse or IntelliJ or NetBeans):

With the release of IDE by various vendors helped developer in a long way to write/code only important business logics
With IDE, generating getter/setter, constructor, renaming, refactoring, etc. becomes very easy
With Eclipse IDE, writing/coding different parameterized constructor is very easy within few shortcut keys and it has Menu to navigate through (rather it is called generating)
There are similar shortcut keys available in all other leading IDE like NetBeans, IntelliJ, etc.

3. Generate constructor with fields in Eclipse IDE:

Step 1: Create a POJO with 4 member variables

Step 2: Generate Constructor with fields

Right-click on the Java file –> Select Source –> Generate Constructor with Fields…

Step 3: Choose fields for which you want to include in Constructor parameter

Note:

it can be limited by un-checking fields whichever isn’t required
allows to indicate insertion point like after which field/method, generated constructor needs to be placed
also, we can specify Access Modifier; but generally it is selected as public unless we are going to generate constructor for Singleton
and there are few other things which comes handy while generating constructor for any Java class

Step 4: View Java file with all attributes inside 4-arg parameterized constructor

Here, it is!!

4. Useful Eclipse IDE shortcuts :

Related Articles:

References:

Happy Coding !!
Happy Learning !!

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