Java 8数组流过滤器

Question

I have one simple array with custom object and want to filter with java 8 stream.

    A[] aArray = new A[3];

    A a1 = new A();
    a1.setaId(1);
    a1.setaName("AName1");

    B b1 = new B();
    b1.setbId(1);
    b1.setbName("BName1");

    a1.setB(b1);
    aArray[0] = a1;

    A a2 = new A();
    a2.setaId(2);
    a2.setaName("AName2");

    B b2 = new B();
    b2.setbId(2);
    b2.setbName("BName2");

    a2.setB(b2);
    aArray[1] = a2;

Can you please suggest how can I go for filter stream on array NOT ON arrayList

Basically I want to filter with only "BName2" value.

Answer 1

If you are storing unique element in the array then you can use following approach

If the object is Unique

A aWithValidString = Arrays.stream(aArray)
    .filter(a -> "BName2".equals(a.getB().getbName()))
    .finAny().orElse(null);

If you have multiple Objects in Array with "Bname2" string you can use Below code

List<A> filteredObject = Arrays.stream(aArray)
    .filter(a -> "BName2".equals(a.getB().getbName()))
    .collect(Collectors.toList());

And Iterate List