jtextfield t=new jtextfield();
jtextfield t1=new jtextfield();
jtextfield t2=new jtextfield();
i want to get the values of textfield t and t1 and display in t2
like i want to add values of t and t1 and store in t2
Have another look at setText... your syntax is wrong in
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t1.getText() will give you the current contents of the field as a String.
Next you have to convert that to a numeric value (eg int or float).
Then you can add/subtract etc the values
Then convert the result back to a String
Finally set the result field's text to that String.
To convert between Strings and numbers there are useful methods in the appropriate numeric classes, eg
Integer.parseInt(aString); // converts String to Integer
Integer.toString(anInt): // converts int to String
You should look these up yourself to learn about them properly.