Collection delete element technique removeif

removeIf

removeIf() It's from JDK1.8 Start offering .

see API file ：

Delete all elements of this collection that satisfy the given predicate . Errors or runtime exceptions thrown in iterations or predicates are forwarded to the caller .

We deleted List Elements in , Generally, loop traversal is used to realize . Found today removeIf useful , Make a note of .

Previous practice ：

        List<String> testList = new ArrayList<>();
        Iterator<String> it = testList.iterator();
        while (it.hasNext()) {
            if ("aa".equals(it.next())) {
                it.remove();
            }
        }

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Now you can use ：

        testList.removeIf(s -> "aa".equals(s));
    //  perhaps 
        testList.removeIf("aa"::equals);

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