How to do the opposite of StringBuilder append in Java?

Question

What would be the opposite of:

savedPlanets.append(planet.getDisplayName()+\",\");

I have a list and I am adding the name of the planet every t

Answer 1

Assume... StringBuffer savedPlanets...

APPEND : savedPlanets.append(planet.getDisplayName()+",");

OPPOSITE OF APPEND : savedPlanets.replaceAll(planet.getDisplayName()+",","");

EX:

savedPlanets.append("Earth,");
savedPlanets.append("Mercury,");
savedPlanets.append("Venus,");

now savedPlanetes= "Earth,Mercury,Venus,";

then

savedPlanets.replaceAll("Venus,",""); <-----

now value will be savedPlanetes= "Earth,Mercury,";