Raja has Published 582 Answers

What are the differences between length and length () in Java?

raja
raja
Published on 26-Jun-2019 13:31:40
The length is an instance variable of an array in Java whereas length() is a method of String class.lengthAn array is an object that holds a fixed number of values of the same type.The length variable in an array returns the length of an array i.e. a number of elements ... Read More

Can we declare a try catch block within another try catch block in Java?

raja
raja
Published on 26-Jun-2019 11:58:49
Yes, we can declare a try-catch block within another try-catch block, this is called nested try-catch block.Nested Try-Catch BlockIf an inner try statement does not have a matching catch statement for a particular exception, the control is transferred to the next try statement catch handlers that are expected for a matching ... Read More

Can we declare a top level class as protected or private in Java?

raja
raja
Published on 26-Jun-2019 10:38:12
No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier). If it does not have a modifier, it is supposed to have a default access.Syntax// A top level class    public class TopLevelClassTest {       // Class body }If ... Read More

Can a method local inner class access the local final variables in Java?

raja
raja
Published on 25-Jun-2019 18:59:03
Yes, we can access the local final variables using the method local inner class because the final variables are stored on the heap and live as long as the method local inner class object may live.Method Local Inner ClassA local inner class instance can be delivered as an argument and retrieved ... Read More

How to handle the ArrayStoreException (unchecked) in Java?

raja
raja
Published on 25-Jun-2019 15:39:55
The java.lang.ArrayStoreException is an unchecked exception and it can occur when we try to store an object of a type in an array of objects of a different type. Usually, one would come across java.lang.ArrayStoreException: java.lang.Integer which occurs when an attempt is made to store an integer in an array of different type like ... Read More

How to handle the NumberFormatException (unchecked) in Java?

raja
raja
Published on 25-Jun-2019 13:17:18
The NumberFormatException is an unchecked exception thrown by parseXXX() methods when they are unable to format (convert) a string into a number.The NumberFormatException can be thrown by many methods/constructors in the classes of java.lang package. Following are some of them.public static int parseInt(String s) throws NumberFormatExceptionpublic static Byte valueOf(String s) throws NumberFormatExceptionpublic static byte parseByte(String s) throws NumberFormatExceptionpublic ... Read More

How to handle the ArithmeticException (unchecked) in Java?

raja
raja
Published on 25-Jun-2019 11:45:13
The java.lang.ArithmeticException is an unchecked exception in Java. Usually, one would come across java.lang.ArithmeticException: / by zero which occurs when an attempt is made to divide two numbers and the number in the denominator is zero. ArithmeticException objects may be constructed by the JVM.Example1Live Demopublic class ArithmeticExceptionTest {    public static ... Read More

What are the differences between protected and default access specifiers in Java?

raja
raja
Published on 25-Jun-2019 10:24:01
The Protected access specifier is visible within the same package and also visible in the subclass whereas the Default is a package level access specifier and it can be visible in the same package.Protected Access SpecifierProtected will acts as public within the same package and acts as private outside the package.Protected will also act as ... Read More

What is an OutOfMemoryError and steps to find the root cause of OOM in Java?

raja
raja
Published on 24-Jun-2019 15:40:27
The OutOfMemoryError is thrown by JVM, when JVM does not have enough available memory, to allocate. OutOfMemoryError falls into the Error category in Exception class hierarchy.To generate OutOfMemoryErrorWe will allocate a large chunk of memory, which will exhaust heap memory storage.We will keep on allocating the memory and point will reach, when JVM ... Read More

Can we write any code after throw statement in Java?

raja
raja
Published on 24-Jun-2019 15:27:49
No, we can not place any code after throw statement, it leads to compile time error Unreachable Statement.Throw keyword in JavaThe throw keyword is used to throw an exception manually.Whenever it is required to suspend the execution of the functionality based on the user-defined logical error condition, we will use this ... Read More
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