How does contains work java

String contains Example 1: Example program to check the given string in present in the input string or not. If it contains, returns ture. Otherwise, returns false. First two contains statements print true. Last contains statement prints false because it is not in input string.

String contains Example 2: When to use contains method? Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering.

Web Technology. If you are just getting started with this stuff, I strongly recommend the Effective Java book by Joshua Bloch. It's a great read, and covers this sort of thing plus how to correctly implement equals when you are trying to do more than identity based comparisons.

Shortcut from JavaDoc :. Returns true if this list contains the specified element. As other Answers explain, you must override the Object equals method for List contains to work. A record is a brief way to write a class whose main purpose is to communicate data transparently and immutably. By default, you simply declare the member fields. The logic of equals by default is to compare each and every member field of one object to the counterpart in another object of the same class.

Likewise, the default implementations of hashCode and toString methods also consider each and every member field. Back to your List contains question. Bonus feature: A record can be declared locally, within a method. Or like a conventional class you can declare a record as a nested class, or as a separate class. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. How does a ArrayList's contains method evaluate objects? Ask Question. Asked 11 years, 7 months ago. Active 6 months ago. Viewed k times. Improve this question. Bakuriu Mantas Vidutis Mantas Vidutis Add a comment. Active Oldest Votes. ArrayList implements the List Interface. Improve this answer. PurkkaKoodari 6, 5 5 gold badges 33 33 silver badges 54 54 bronze badges.