In Java, the equals() the method is used to determine if two objects are equal. It is defined in the Object class, which is the root of the Java class hierarchy, and it is inherited by all Java Write a Java method that will remove duplicates from a given list. Assuming: Method accepts type List. Return type is void. Duplicates are determined using equals () Main: Creates an instant of List and loads it with duplicate String values. Invoke removeDuplicates (), pass in this list. Outputs modified list to the console.
Using the Not Equals Operator With equals () We can use the ! operator with the equals () method to check if the contents of the variables match or not. In the example, we take two String variables. In the if condition, we check the str1.equals (str2) with a ! operator at the beginning. The ! operator makes the result opposite, which means if
Yes, StringBuilder does not override Object 's .equals () function, which means the two object references are not the same and the result is false. For StringBuilder, you could use s1.toString ().equals (s2.toString ()) For your edit, you're calling the == operator on two different String objects.
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.
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how to use equals method in java