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Core Java - Interview Questions and Answers for 'Equals method' - 2 question(s) found - Order By Newest

Q1. In Java, if object A contains same the same data of object B, are they equal?

^{2017-04-23 19:11:04}

Ans. it depends on the implementation of equals method of the respective class. If no definition is provided and it uses the default definition of the object class, two references are equal only if they point to the same object.

We can have such an equality defined for a particular class objects if we provide appropriate implementation of equals method comparing all those fields.

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Q2. why is "".equals(str); safer than str.equals("")?

^{2019-01-31 20:34:18}

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In Java, if object A contains same the same data of object B, are they equal?

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Q3. Which of the following is false ?

a. A Class cannot override both hashcode and equals method.

b. A class can override both hashcode and equals method.

c. A Class must override hashCode method if its overridding equal method.

d. A Class can override hashCode even if its not overridding equals method.

Ans.a. A Class cannot override both hashcode and equals method.