jtable-adding a row dynamically

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jtable-adding a row dynamically

hi..i am doing a project for pharmacy .. *pblm:* when i want to enter the details in jtable while running the application there are 3 rows and 4 columns which is default bt when we we have to add one more row dynamically as a new row 4th if the details are large.but every time if we run a project it must show the default 3 rows and 4 columns and if the user want enter the data to a 4th row he must press enter at the end of the 3rd row a new row 4th row shuld be formed any one can help me for this...............

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