public class Button {

  int x,y;
  int w, h;
  boolean clicked;

  public Button(int x, int y){
    this.x = x;
    this.y = y;
    this.w = 100;
    this.h = 30;
    clicked = false;
  }

  public void draw(){
    if (clicked) {
      fill(255);
    } else {
      fill(127);
    }
    stroke(0);
    rect(x,y, w,h);
  }

  public void clicked(){
    if (mouseX >= x && mouseX <= x+w && mouseY >= y && mouseY <= y+h) {
      clicked = !clicked;
    }
  }
}