用java8替换foreach

Question

如何按照java8转换此代码，使其在父列表中具有内部列表并进行过滤？

for(A aobj: branchList) {
    for(C cobj : aobj.getCList()) {
        if(!enteredBranchId.equals(cobj.getId())
            myList.add(aobj.getId());
    }
}

Answer 1

myList = branchList.stream()
           .map(b -> b.getSubBranches())  
           .flatMap(Collection::stream)
           .filter(sb -> !enteredBranchId.equals(sb.getBranchId()))
           .collect(Collectors.toList());