Table of Contents
- 1 Does two Object will always be equal when there compareTo () method returns zero?
- 2 What happens when you set two objects equal in Java?
- 3 What is the relationship between equals and compareTo in Java?
- 4 What is equals method in Java?
- 5 What is the difference between compareTo and equals in Java?
- 6 What is the difference between equals and equals ignore case?
- 7 What is string equals() method in Java?
- 8 How to check whether two objects contains the same data or not?
Does two Object will always be equal when there compareTo () method returns zero?
It is strongly recommended, but not strictly required that (x. compareTo(y)==0) == (x. equals(y)). Generally speaking, any class that implements the Comparable interface and violates this condition should clearly indicate this fact.
What happens when you set two objects equal in Java?
Java determines equality with the equals(Object o) method – two objects a and b are equal iff a. equals(b) and b. equals(a) return true . These two objects will be equal using the base Object definition of equality, so you don’t have to worry about that.
What happens if equals method always return true?
lang. Object class and their default implementation is based upon Object information e.g. default equal () method return true if two objects are exactly the same i.e. they are pointing to the same memory address while default implementation of hashcode method return int and is implemented as a native method.
What is the need for overriding equals () method in Java?
Java recommends to override equals and hashCode method if equality is going to be defined by logical way or via some business logic and many classes in Java standard library does override it e.g. String overrides equals, whose implementation of equals() method return true if the content of two String objects is exactly …
What is the relationship between equals and compareTo in Java?
compareTo: Compares two strings lexicographically. equals: Compares this string to the specified object. compareTo compares two strings by their characters (at same index) and returns an integer (positive or negative) accordingly. equals() can be more efficient then compareTo().
What is equals method in Java?
.equals() In Java, string equals() method compares the two given strings based on the data/content of the string. If all the contents of both the strings are same then it returns true. If all characters are not matched then it returns false.
What is an equals method in Java?
Java String equals() Method The equals() method compares two strings, and returns true if the strings are equal, and false if not.
Can you override equals method?
You can override the equals method on a record, if you want a behavior other than the default. But if you do override equals , be sure to override hashCode for consistent logic, as you would for a conventional Java class.
What is the difference between compareTo and equals in Java?
What is the difference between equals and equals ignore case?
The only difference between them is that the equals() methods considers the case while equalsIgnoreCase() methods ignores the case during comparison. For e.g. The equals() method would return false if we compare the strings “TEXT” and “text” however equalsIgnoreCase() would return true.
Why does equals method return false in Java?
Expression B => returning false. Every class implicitly extends Object class. Therefore, the implementation of the equals method is using the one defined in Object class which is the same with the expression A Expression C => returning false. The reason is the same with the Expression A comparing two distinct object
Why does equals() return false when comparing two strings?
Expression C => returning false. The reason is the same with the Expression A comparing two distinct object Expression D => returning true. Because String class has its own implementation of equals function which check the value of the string. The “Emp” class inherits the equals () method from the root “OBJECT” class.
What is string equals() method in Java?
In Java, string equals () method compares the two given strings based on the data/content of the string. If all the contents of both the strings are same then it returns true. If all characters are not matched then it returns false. filter_none. edit.
How to check whether two objects contains the same data or not?
In Java, string equals () method compares the two given strings based on the data/content of the string. If all the contents of both the strings are same then it returns true. If all characters are not matched then it returns false. Explanation: Here we are using .equals method to check whether two objects contains the same data or not.