Java - Compare the Objects using equals() & hashCode()
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By default equals method only compare the reference object
To compare based on Object value, override the equals & hashcode method
First compare by hashcode(), if hashCode of both Objects are different, then objects are not equal
but if hashcode of both Objects are same, then we check the equals method
hashcode is used to quickly checl the equality
Now whenever you're adding Object in Set or Map, then also you need to overide the equals & hashcode
Because, Set & Map check the equality & if Object are equal it won't add again so you need to add equality
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