How does get method of hashmap works | implementation of hashmap get method 

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Java interview questions
How hashmap works ?
what is hashcode method ?
what is the equals method ?
what is need to override equals method ?
what is need to override hashcode method ?
how is hashmap implemented ?
what will happen if you do not overide equals method ?
what will happen if you do not overide hashcode method ?
what will happen if equals method always return true ?
what will happend if hashcode method only return specific value ?
what is the contract between hashcode and equals method ?
what is new implementation of hashmap in java 8 ?