while循环jtextfield仅接受字母

Question

I want to force a textfield to only accept letters and white space. I tried this function that looks fine to me but it only prints:

accepted and i=0 So I can see that it's a problem of local variable or smthg like that;

public void ff()
{Boolean bool=true;
int i=0;


     name=textField.getText();
     while(bool && i<name.length())
     {
         if(Character.isLetter(name.charAt(i)))
             i++;
         else
            bool=false;
     }
    if (bool=true) 
            System.out.println("accepted"+i);
    else 
            System.out.println("wrong"+i);

}

Can you help me to figure it out? and Please I want to use this function not documentfilter or formattedtext.

Answer 1

bool=true is assignment, not comparison.

Change if (bool=true) to if (bool==true) or if (bool) . Otherwise, you'll always print accepted .