Which version of controlP5 are you using?

Version 0.7.5 has a ControlP5 Textfield example that shows exactly what you need through two ways.

1. Via .getText()
2. Via a String connected to a controller

If you -for some reason- don't understand the example, elaborate on exactly what you don't understand. Because in my opinion it doesn't get much clearer than that.

And don't make the common mistake of comparing Strings with == instead of .equals (see the forum).

Sidenote: no need to scream at us! By that I mean you can leave out all the exlamation marks! Thank you!

i dont understand how u use the .getText() 

All right, here is another example.

You can type something in the textfield. Line 20 gets the text from the textfield. Line 21 puts this text on the screen. Line 22-26 compares it to another String and depending on the result, displays a different text. Try typing some random text or type the exact word test like in the String mySentence.

Code Example

1. import controlP5.*;
2. ControlP5 cp5;
3.  
4. Textfield myTextfield;
5.  
6. String mySentence = "test";
7.  
8. void setup() {
9.   size(400, 400);
10.   PFont font = createFont("arial", 30);
11.   textFont(font);
12.   cp5 = new ControlP5(this);
13.   myTextfield = cp5.addTextfield("myTextfield")
14.   .setPosition(50,50).setSize(300,50)
15.   .setFocus(true).setFont(font);
16. }
17.  
18. void draw() {
19.   background(0);
20.   String myText = myTextfield.getText();
21.   text(myText, 50, 200);
22.   if (myText.equals(mySentence)) {
23.     text("MATCH!", 50, 300);
24.   } else {
25.     text("Type \"test\" to match", 50, 300);
26.   }
27. }