Iterating (for-loop) version of the Stream API example. See also: https://gist.github.com/dlhartveld/5198058

IteratingBlocks.java

List<Block> blocks = /* ... */;

int sumOfWeights = 0;
for (Block block : blocks) {
  if (block.getColor() == Color.RED) {
    sumOfWeights += block.getWeight();
  }
}