How to Randomly choose Void methods in android? [duplicate]

This question already has an answer here:

• Call random methods in Android 3 answers

I'm developing an app, and for some reason, I want to pick one public void method randomly at a time on button click, please help me to write the code. Thank you!

Button b;
Random r;

b.setOnClickListener() {
// pick one public void at a time randomly
// choose either A, B, C, D, E
}

public void A () {
// codes for a
}

public void B () {
// codes for b
}

public void C () {
// codes for c
}

public void D () {
// codes for d
}

public void E () {
// codes for e
}