Calling Method by using String instead of ObjectName - Processing in Eclipse - eclipse

Question

I am trying to combine multiple sketches I had, by having them as classes in a single sketch and go through them by pressing keys.
I'm not sure I'm following the right method but I'm basically turning them on and off by using a boolean for each. I have something like:
package combiner;
public class Combiner extends PApplet {
//...
ClassNameOne s1;
ClassNameTwo s2;
//...
ClassNameNine s9;
// AllSketches //
boolean[] sketches;
int totalSketches = 9;
String str_ts = String.valueOf(totalSketches);
char char_ts = str_ts.charAt(0);
public void setup() {
size(1920, 1080);
sketches = new boolean[totalSketches];
for (int i = 0; i < sketches.length; i++) {
sketches[i] = false;
}
s1 = new ClassNameOne(this);
s2 = new ClassNameTwo(this);
//...
s9 = new ClassNameNine(this);
}
public void draw() {
//drawingEachSketchIfItsBoolean==True
if (sketches[0] == true) {
s1.run();
} else if (sketches[1] == true) {
s2.run();
//....
}
}
public void keyPressed() {
if (key >= '1' && key <= char_ts) {
String str_key = Character.toString(key);
int KEY = Integer.parseInt(str_key);
for (int i = 0; i < sketches.length; i++) {
sketches[i] = false;
}
sketches[KEY - 1] = true;
//initializingEachClassIfKeyPressed
if (KEY == 0) {
s1.init();
} else if (KEY == 1) {
s2.init();
}
//....
}
}
As you can see each Class has an .init and a .run method (used to be my setup + draw).
I was wandering if somehow I can loop to .init or .run them without having to write it once for each, something like:
for(int i=0;i<sketches.length;i++){
if(sketches[i]==true){
String str = String.valueOf(i+1);
str="s"+str; //str becomes the Object's name
??? str.run(); ???
}
}

Answer 1

The cleanest solution would be to create an interface Sketch, which must be implemented in your sketch classes then:
Sketch[] sketches;
int activeSketch = 0;
void setup(){
sketches = new Sketch[2];
sketches[0] = new SketchRed();
sketches[1] = new SketchGreen();
sketches[activeSketch].init();
}
void draw(){
sketches[activeSketch].draw();
}
interface Sketch{
void init();
void draw();
}
class SketchRed implements Sketch{
void init(){}
void draw(){
fill(255, 0, 0);
ellipse(width/2, height/2, 30, 30);
}
}
class SketchGreen implements Sketch{
void init(){}
void draw(){
fill(0, 255, 0);
ellipse(width/2, height/2, 30, 30);
}
}
void keyPressed(){
activeSketch++;
if(activeSketch >= sketches.length){
activeSketch = 0;
}
sketches[activeSketch].init();
}

Answer 2

I am not sure if the whole idea of representing different sketches as classes in a new sketch is really that good, but in any case there seems to be a possibilty in Java for obtaining a class from a String! Look for Class.forName() as described here: http://docs.oracle.com/javase/tutorial/reflect/class/classNew.htm
Keep in mind that you will obtain a class from this and not an instance yet!