🪔 How To Use Equals Method In Java

12 Answers. The best way is to use str.equalsIgnoreCase ("foo"). It's optimized specifically for this purpose. You can also convert both strings to upper- or lowercase before comparing them with equals. This is a trick that's useful to remember for other languages which might not have an equivalent of equalsIgnoreCase. Since java.lang.String class override equals method, It return true if two String object contains same content but == will only return true if two references are pointing to same object. Here is an example of comparing two Strings in Java for equality using == and equals() method which will clear some doubts: The isEqual () method of LocalDate class in Java checks if this date is equal to the specified date or not. Syntax: public boolean isEqual (ChronoLocalDate date2) Parameter: This method accept a single mandatory parameter date2 the other date to compare to and not null. Return Value: The function returns true if this date is equal to the A workable approach to handle that situation may be to have the base type implement an equals2 method, which return 1 if its special knowledge of the other object meant it could tell it was equal, -1 if it could tell it was not equal, or 0 if it couldn't tell. If either type's equals2 method knows they're unequal, they're unequal. Otherwise, if But I think it's highly unpredictable when the subclass will override some of the methods. For instance when I compare 2 DiscountedItem objects using equals, the super method is called and item.getPrice() is dynamically dispatched to the correct method in the subclass DiscountedItem, whereas the other price value is accessed directly using The Object class equals method compares the object using reference. i.e. a.equals(a); always returns true. If we are going to provide our own implementation then we will use certain steps for object equality. Reflexive: a.equals(a) always returns true; Symmetric: if a.equals(b) is true then b.equals(a) should also be true. Is it possible to do something like this in Java for Android (this is a pseudo code) IF (some_string.equals("john" OR "mary" OR "peter" OR "etc."){ THEN do something } ? At the moment this is done via multiple String.equals() condition with || among them. The Java string equals () method is used to compare objects and check whether the content of two strings are equal. equals () accepts one parameter: the string you want to compare to another string. Here’s the syntax for the string equals () method: stringName. equals (string2Name); Let’s break this down: stringName is the name of the The equals method in Java serves a specific purpose: it determines if the objects are logically equal, i.e. their content is the same, whatever that may mean in the context of each specific class. This is in contrast to the objects being the same: two different objects could be logically equivalent. Going back to your example, a and b are first off using == to check for equality of objects should never be done; replace it with. for compareTo you can simply return the compareTo of the strings. public int compareTo (Company b) { return this.cName.compareTo (b.cName); } It's a bit too strong to say that using == "should never be done". Use Objects.equals() to compare strings, or any other objects if you're using JDK 7 or later. It will handle nulls without throwing exceptions. See more here: how-do-i-compare-strings-in-java. And if you're not running JDK 7 or later you can copy the equals method from Objects like this: 4 days ago · Integer a = new Integer(1); Integer b = new Integer(1); assertThat(a.equals(b)).isTrue(); The method still returns true when both objects are the same. We should note that we can pass a null object as the argument of the method, but not as the object we call the method upon. We can also use the equals() method with an .

how to use equals method in java