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| class Fruit { | |
| private String name; | |
| public Fruit(String name) { | |
| this.name = name; | |
| } | |
| public String getName() { | |
| return name; | |
| } | |
| // not override equals method. | |
| public boolean equals(Fruit o) { | |
| if (this == o) return true; | |
| if (!(o instanceof Fruit)) return false; | |
| Fruit fruit = (Fruit) o | |
| return Objects.equals(getName(), fruit.getName()); | |
| } | |
| @Override | |
| public int hashCode() { | |
| return Objects.hash(getName()); | |
| } | |
| } | |
| @Test(expected = AssertionError.class) | |
| public void testEquals() { | |
| Fruit apple1 = new Fruit("apple"); | |
| Fruit apple2 = new Fruit("apple"); | |
| Set<Fruit> fruits = new HashSet<>(); | |
| fruits.add(apple1); | |
| fruits.add(apple2); | |
| assertEquals(1, fruits.size()); | |
| } |
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