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output the values in an array

Posted on 2014-01-10
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Last Modified: 2014-01-30
Hi,

I am going through below example
http://www.avajava.com/tutorials/lessons/whats-a-quick-way-to-output-the-values-in-an-array.html?page=2

ArrayUtils.toString() is a great way to display the values of simple data types. For more complex data types, like JavaBeansW, you can use ArrayUtils.toString() in conjunction with ToStringBuilder.reflectionToString() in the toString() method of your complex data type to display the values of your objects in your array.


I have not understood what author meant by above line.

please advise
Any links resources ideas highly appreciated. Thanks in advance
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Question by:gudii9
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by:Sharon Seth
Sharon Seth earned 100 total points
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It mans it is a great way to use ToStringBuilder.reflectionToString() in toString() to print your array of complex types .
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zzynx earned 400 total points
ID: 39775896
For arrays of simple data types you can use ArrayUtils.toString() and that gives you the expected result "by default".

For complex data types (classes), you have to override the toString() method of those classes.
i.e. exactly specify how you want the string representation of an instance of your complex class to look like.

The sentence you don't understand states, that in the latter case, you can use ToStringBuilder.reflectionToString() in that toString() method code you write.
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by:gudii9
ID: 39783961
in this link where they used

ToStringBuilder.reflectionToString() in that toString() method code you write.

Any other links to understand this concept better
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Expert Comment

by:zzynx
ID: 39784663
>> where they used
In the class TestClass.
Method:

public String toString() {
    return "\n" + ToStringBuilder.reflectionToString(this);
}

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by:gudii9
ID: 39797891
the ArrayTest class contains an inner class called TestClass.

I wonder why author used inner class in this case. please advise
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Expert Comment

by:zzynx
ID: 39803213
In this (simple) case TestClass could have been perfectly a "global" class too.

When should inner classes be used in Java?
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by:gudii9
ID: 39816223
I wonder what  is a need for inner class even after reading the link you posted.
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Expert Comment

by:zzynx
ID: 39817054
That article gives a nice example. I can't do any better. Sorry.
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Expert Comment

by:zzynx
ID: 39820466
Thanx 4 axxepting
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