How to read and write excel file

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I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?

I want to do the following:

for(i=0; i <rows; i++)
     //read [i,col1] ,[i,col2], [i,col3]

for(i=0; i<rows; i++)
    //write [i,col1], [i,col2], [i,col3]

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