Java: How to recognize a specific string

Question

I'm making a simple chat through Swing, and having some issues.

I'm trying to make my client send a private message to another user when it get's input "/w anotheruserid". It's not about the EventHandler, but how to recognize the string. The event handler is to be like the one below.

public void keyTyped(KeyEvent e) {
if(textField.getText().equals("/w ")){

     }
}

How should I make it to get additional string input such as another user's id?

Answer 1

use startsWith

if(textField.getText().startsWith("/w ")){
}

That way you can simply substring the text and exclude the /w part to use it as /w something .

String message = textField.getText().substring(2);

Answer 2

您可以为此使用正则表达式，或者可以使用String子字符串函数来获取前两个字符，然后可以将它与“/ w”匹配。

Answer 3

if(textField.getText().equals("/w ")){

This condition is true only if the text in textField is " /w ";

You can use if(textField.getText().startsWith("/w ")) instead.

And then you can remove the first 3 characters, including '/', 'w' and Space ' ', to populate another user id.

Using StringValue.substring(3) ;

An example is as follows:

String text = "/w anotheruserid";

    System.out.printf("Before populating anotheruserid==>%s\n", text);
    if (text.startsWith("/w ")) {
        text = text.substring(3);

        /*
         * Remove the first 3 characters, including '/' ,'w' and ' ')
         */

        System.out.printf("After  Populating anotheruserid==>%s\n", text);
    }

Output in Console:

Before populating anotheruserid==>/w anotheruserid
After  Populating anotheruserid==>anotheruserid