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isBlank() vs isEmpty() in String class Java

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isBlank() is a new method introduced in String class in Java. By naming isBlank() and isEmpty() methods look similar to each other, but there is a slight difference between them – isBlank() returns true for the string having only white space characters whereas isEmpty() will return false for such strings. Let us understand the difference … Read more

Comparator in Java

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Comparator Interface is a very useful interface which is used to sort the objects on some predefined conditions. Usually when we want to sort Integer type ArrayList then we use Collections.sort(arrayListName). This will sort the list of integers in ascending order. But what if we want to sort Student objects based on the marks students … Read more

Local vs Instance vs Class vs Reference variable in Java

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In Java we have 4 type of variables :- Local Variable Instance Variable Class variable Reference variable Java developers often get confused while using these terms, let us understand the difference between them in detail : Local Variable Local variables are those which are defined inside a block, method or constructor. These variables get destroyed … Read more