ArrayList also provides a random search if you know the index, while LinkedList only allows a sequential search. In short, ArrayList is backed by an array in Java, while LinkedList is just a collection of nodes, similar to a linked list data structure. Just like Runnable, Callable also defines a single call() method but unlike run() it can return values and throw exceptions.Ĥ) Difference between ArrayList and LinkedList in Java? ( detailed answer) Runnable was the only way to implement a task in Java that can be executed in parallel before JDK 1.5 adds Callable. The difference comes from the fact that you can only extend one class in Java, which means if you extend the Thread class you lose your opportunity to extend another class, on the other hand, if you implement Runnable, you can still extend another class.ģ) Difference between Runnable and Callable interface in Java? ( detailed answer) In later two, StringBuffer is synchronized while StringBuilder is not, in fact, it's a ditto replacement of StringBuffer added in Java 1.5.Ģ) Difference between extending Thread vs implementing Runnable in Java? ( detailed answer) converting String to upper case or trimming white space will produce another instance rather than changing the same instance. String is immutable while both StringBuffer and StringBuilder are mutable, which means any change e.g. 1) Difference between String, StringBuffer, and StringBuilder in Java? ( detailed answer)
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