how to change a column data in a every row in a text file in java

how to change a column data in a every row in a text file in java

i have text file like this 11,6,13/9/14,1287605778,89$ 11,6,12/8/14,8987605798,80$ 11,6,19/9/14,34876057688,890$ 11,6,17/9/14,67876057678,79$ 11,6,25/9/14,12876057658,23$ ........ so many lines are there like this i need to change 4th column in every row ie. account number to some text in a text file in java could any one help please

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