Java 8 is a giant step forward for the Java language. Writing this book has forced me to learn a lot more about it. In Project Lambda, Java gets a new closure syntax, method-references, and default methods on interfaces. It manages to add many of the features of functional languages wit...
Avoiding NullPointerException in Java What are the differences between a HashMap and a Hashtable in Java? How do I generate random integers within a specific range in Java? How can I create a memory leak in Java? What is the difference between public, protected, package-private and ...
Is Java "pass-by-reference" or "pass-by-value"? How do I read / convert an InputStream into a String in Java? Avoiding NullPointerException in Java What are the differences between a HashMap and a Hashtable in Java? What is the difference between public, protected, package-private...
To handle this exception, Java provides a classNullPointerExceptionlocated in thejava.langpackage. We can use this class in thecatchblock to specify the exception type and then catch it to avoid code break. The most basic example to understand theNullPointerExceptionclass is to create astringobj...
The OS sees and uses the hardware runtime: CPUs, application data registers, code registers (i.e. the program counter), memory registers (e.g. the stack pointer), virtual memory and CPU modes. In particular, CPUs can switch between a limited user mode and a more powerful kernel mode whe...
A common issue when working with objects in Java is the Null Pointer Exception. This occurs when you try to access a method or attribute of an object that hasn’t been initialized. classMyClass{StringmyAttribute;}MyClassmyObject=null;System.out.println(myObject.myAttribute);#Output:#Exception...
null is a very critical factor that means we need to focus when we work with null. null is a keyword in Java and it is related to NullPointerException and NullPointerException is a package in java.lang package like this java.lang.NullPointerException. We will see NullPointerException throw...
For example, a developer might forget to free up memory after the program no longer needs it, leading to a memory leak that quickly consumes all the availableRAM. Or the developer might free up an object's memory space without modifying a corresponding pointer, resulting in adangling pointerth...
element is pushed onto the top of a stack, the stack pointer is updated to the next physicalmemoryaddress on the stack. When a data element is popped from the top of a stack, the stack pointer is again updated to the next address, but this time the address changes in the opposite ...
These exceptions result from programming errors, such as logical errors or incorrect calculations in the code. Common exceptions include: ArithmeticException: When performing invalid arithmetic operations (like division by zero). NullPointerException: This occurs when trying to attempt to use a null ...