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setter method of bean

Last Modified: 2015-03-16

When we can initialize/assign the field values of a class within constructor right like below

sample constructor of Persons object
public Persons(String last, String first, int i)
lastNm = last;
firstNm = first;
age = i;

If this is the case why we need setter methods. I can understand we need to getter to retrieve back those values. please advise
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