The Arrays.equals (a, b) will eventually call a0.equals (b0) which will return false. For this reason, Arrays.equals (a, b) will return false as well. So your code will print Different. and we conclude that Java equality can be tricky sometimes. Use Arrays.deepEquals () for multidimensional arrays. JUnit testing of java Equal method. I wrote this code but I am still new in JUnit and have no idea of testing equal and equal2 method. Below is the code I wrote. My object in this code is to see if the fname is equal to lname using equal method and by using equal2 to check if fname is same as fname (it self) maybe my code have errors too. Since Java 7 you can use the static method java.util.Objects.equals(Object, Object) to perform equals checks on two objects without caring about them being null. If both objects are null it will return true , if one is null and another isn't it will return false .
You have assertEquals(a,b) which relies on the equals() method of the Object class. Here it will be evaluated as a.equals( b ). Here the class under test is used to determine a suitable equality relation. If a class does not override the equals() method of Object class, it will get the default behaviour of equals() method, i.e. object identity.
Applying the method java.lang.CharactertoLowerCase (char) to each character produces the same result. So using equalsIgnoreCase we iterate through the Strings (only if their size values are the same) comparing each char. In the worst case, we will performance will be O ( 3cn ) where n = the size of your strings.
Also, you will need to override the hashCode method in your class Fraction in order to use HashMap. Since this equals implementation only depend on one value (the result of the fraction) you could use the following : public int hashCode () { return 0;//all Fraction return the same hashCode, which make HashMap call equals each time //EDIT: the
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    • how to test equals method in java