Question

In java

given the following code how would I validate that that upper case & lower case letters are are ignored and accepted as the same?

// TODO add your handling code here:
String name = nameTextField.getText().trim();
if(name.isEmpty()){
JOptionPane.showMessageDialog(this, "Username field is empty. Please correct.");
return;
}
if(name.indexOf(" ")!=-1){
JOptionPane.showMessageDialog(this, "Username field cannot contains space in it. Please correct.");
}

Answer 1

Answer:

String name = nameTextField.getText().trim();

name = name.toLowerCase();
if(name.isEmpty()){
JOptionPane.showMessageDialog(this, "Username field is empty. Please correct.");
return;
}
if(name.indexOf(" ")!=-1){
JOptionPane.showMessageDialog(this, "Username field cannot contains space in it. Please correct.");
}

Explanation: java provides toLowerCase() method which converts all characters of the string into lowercase letter. So when you read a name convert it into lower case and then validate.