how to accept only numbers and whitespace in java

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Élie
02 Feb 2020
1char text_in_patient_contact = evt.getKeyChar();
2        if (Character.isDigit(text_in_patient_contact)||Character.isISOControl(text_in_patient_contact)) {
3            medicine_name_input.requestFocus();
4            patient_input_error.setText("");
5        }
6        else{
7             patient_input_error.setText("Worong Phone");
8        }
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