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There are many classes in Java to generate random numbers. Random and ThreadLocalRandom are best to generate numbers between ranges. ThreadLocalRandom class Since Java 7, it provides ThreadLocalRandom class to generate random numbers. A random number generator isolated to the current thread. Like the global Random generator used by the Math class, a ThreadLocalRandom is…

Many time printing arrays in Java are required to logging and debugging purpose. In Java provides Arrays.toString(arr) or Arrays.deepToString(arr) for arrays within arrays (a nested array) to formatting simple arrays into printable strings. Example of printing a simple array: String names[] = new String[] {“ssp”,”anu”,”kirti”,”shaurya”}; System.out.println(names); System.out.println(Arrays.toString(names)); the output of above code is given below: [Ljava.lang.String;@2a139a55 [ssp, anu,…

ArrayIndexOutOfBoundsException is an exception, thrown to indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array. illegal index in java is index value less than zero or -ve values and index value equal to or greater than array…

In Java, strings are the reference type. So we can not compare two strings using the == operator as it compares references (will only return true when both references are of the same object). In Java, all objects are derived from class Object which has one method equals, which is used to compare equality of…

In Java NullPointerExceptions are exceptions that occur when we try to use a reference that points to no location in memory (Know as null) as though it were referencing an object (uninitialized objects or assigned to null object references). Calling a method or accessing a member on a null reference will throw a NullPointerException. Generally,…