Deleting Last Character From a String in Java

Question

Deleting Last Character From a String in Java

528 Views Asked by MadShehan At 06 April 2025 at 19:48

I'm writing a java code which gives an error when typing more than 10 characters in a PasswordField and cannot type from there on. I tried deleting the last character from the PasswordField on a KeyPressed event but instead of deleting the last character, it deletes the character before it and replace it with the last character.Here goes my code.

private void passFieldKeyTyped(java.awt.event.KeyEvent evt) {

String pw1 = new String(passField.getPassword());
    
    if(passField.getPassword().length==10){

        try{

          StringBuffer bf = new StringBuffer(pw1);
           bf.deleteCharAt(10);
          String pw2 = new String(bf);    
           passField.setText(pw2);
                             
          JOptionPane.showMessageDialog(this, "<html><h4>Password Must Not Contain More Than 10 Characters !</h4></html>", "Error !", JOptionPane.ERROR_MESSAGE);

           }

        catch(Exception e){
            
           JOptionPane.showMessageDialog(this, e.getMessage());
        }

    }

I'm still a newbie for programming. I hope someone can help me with this. Thanks !

Original Q&A

There are 3 best solutions below

Linga Lgm Cse On 12 September 2020 at 07:35

public class RemoveChar {  
    public static void main(String[] args) {  
              String str = "India is my country";  
              System.out.println(charRemoveAt(str,));  
           }  
           public static String charRemoveAt(String str) {  
              return str.substring(0, str.length()-1);  
           }  
}

MadShehan On 12 September 2020 at 07:59

Guys I'm so sorry I found out it was a mistake of mine..I actually had to check the length of the passwordfield again and length must be 11 to delete the 10th character. Here goes the code.It worked..Thanks for helping guys !!!!!!!!

private void passFieldKeyTyped(java.awt.event.KeyEvent evt) {

String pw1 = new String(passField.getPassword());
    
    if(passField.getPassword().length==11){

        try{

          StringBuffer bf = new StringBuffer(pw1);
           bf.deleteCharAt(10);
          String pw2 = new String(bf);    
           passField.setText(pw2);
                             
          JOptionPane.showMessageDialog(this, "<html><h4>Password Must Not Contain More Than 10 Characters !</h4></html>", "Error !", JOptionPane.ERROR_MESSAGE);

           }

        catch(Exception e){
            
           JOptionPane.showMessageDialog(this, e.getMessage());
        }

    }

**Mushfiqur Rahman Abir** · Accepted Answer

I guess you are trying to delete a char from the String.

You can use the StringBuilder class here to delete a character at your specified position. First convert your String to StringBuilder -

StringBuilder sb = new StringBuilder(inputString);

Then you can use the built in method deleteCharAt() to delete the char at your desired position like this -

sb.deleteCharAt(10);

Hope this may help you.

Deleting Last Character From a String in Java

There are 3 best solutions below

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