Java tests for identity – whether two things are the same – and equality – whether two things hold the same value – differently.
We do this every day; think of two US quarters. Both are equal – they represent the same value ($0.25 US) – but they're not identical – they're two quarters, not one.
2 == 2; true true == true; true true == false; false 12 == 12.0; true
int equals() tests for equality:
Integer i = new Integer(4); Integer j = new Integer(4); i == j; false i.equals(j); true
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