I want to give my program a better style and I want to link the button with the text box but I can not do it. I want it to look like this.
And I just make it look like this.
Mine is doing it directly with netbeans, the other is done with code directly ...
It depends on the layout you're using. As you have the window, a FlowLayout may be adequate. FlowLayout has a constructor in which you can pass as parameters the space between horizontal components (hgap) and the components with the lower / upper edge (vgap).
Additionally, it has methods setHgap() and setvgap() to fix those spaces.