Is Java “caching” anonymous classes?

Question

Consider the following code:

for(int i = 0;i < 200;i++)
{
  ArrayList currentList = new ArrayList() {{
    add(i);
  }};
  /         


        

Answer 1

The compiler is going to transform any anonymous class to a named inner class. So your code, will be transformed to something along the lines of:

class OuterClass$1 extends ArrayList {
    OuterClass$1(int i) {
      super();
      add(i);
    }
}

for (int i = 0; i < 200; i++) {
    ArrayList currentList = new OuterClass$1(i);
}