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Is it possible to allow only letters or numbers in a string in java ? for example :
String Text;
Text = jTextField1.getText();
now
if (Text is a number) {System.out.println("Invalid Input");}
you have two choices to use
JFormattedTextField with proper
FormatterorInputVerifieruse DocumentFilter
String Text;(possible reserved word for API name or its method) useString text;more in the Naming convention