RemoveSpecificElementFromListTest.java

public class RemoveSpecificElementFromListTest {
    private static final String DEL = "r";
    private static final int EXPECTED_SIZE = 7;
    private List<String> stringList;

    @Before
    public void setup() {
        stringList = new ArrayList<>(Arrays.asList("A", "r", "r", "a", "y", "l", "i", "s", "t"));
    }

    @Test(expected = IndexOutOfBoundsException.class)
    public void listElementRemoveTest0() throws Exception {
        final int size = stringList.size();
        for (int i = 0; i < size; i++) {
            final String s = stringList.get(i);
            if (DEL.equals(s)) {
                stringList.remove(s);
            }
        }

        System.out.println("size = " + stringList.size());
        System.out.println("toString = " + stringList.toString());

        Assert.assertNotSame(EXPECTED_SIZE, stringList.size());
    }

    @Test
    public void listElementRemoveTest1() throws Exception {
        for (int i = 0; i < stringList.size(); i++) {
            final String s = stringList.get(i);
            if (DEL.equals(s)) {
                stringList.remove(s);
            }
        }

        System.out.println("size = " + stringList.size());
        System.out.println("toString = " + stringList.toString());

        Assert.assertNotSame(EXPECTED_SIZE, stringList.size());
    }

    @Test(expected = ConcurrentModificationException.class)
    public void listElementRemoveTest2() throws Exception {
        for (String s : stringList) {
            if (DEL.equals(s)) {
                stringList.remove(s);
            }
        }

        System.out.println("size = " + stringList.size());
        System.out.println("toString = " + stringList.toString());

        Assert.assertEquals(EXPECTED_SIZE, stringList.size());
    }

    @Test
    public void listElementRemoveTest3() throws Exception {
        for (Iterator<String> iterator = stringList.iterator(); iterator.hasNext(); ) {
            final String s = iterator.next();
            if (DEL.equals(s)) {
                iterator.remove();
            }
        }

        System.out.println("size = " + stringList.size());
        System.out.println("toString = " + stringList.toString());

        Assert.assertEquals(EXPECTED_SIZE, stringList.size());
    }
    
    @Test
    public void listElementRemoveTest4() throws Exception {
        stringList.removeIf(DEL::equals);

        System.out.println("size = " + stringList.size());
        System.out.println("toString = " + stringList.toString());

        Assert.assertEquals(EXPECTED_SIZE, stringList.size());
    }
}