public void set(int n, Constant a) {
      set0(n, a);
    }
Sets the element at the given index.

@param n {@code >= 0, < size();} which index
@param a {@code null-ok;} the element to set at {@code n}
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/cst/CstArray.java