top interview questions on core java in java

Automatic variable have to be initialized explicitly. In Core Java, automatic variables, also known as local variables, are not automatically initialized. Automatic variables are variables declared within a method, constructor, or block of code. They don’t receive default values like class variables (instance or static variables) do. If you declare an automatic variable without explicitly … Read more

The static variables are initialized when the class is loaded Non static variables are initialized just before the constructor is called. In Java, static and non-static variables of a class are initialized at different times: Static Variables: Static variables, also known as class variables, are initialized when the class is loaded into the memory by … Read more

class variable is a static variable and does not belong to instance of class but rather shared across all the instances – member variable belongs to a particular instance of class and can be called from any method of the class – automatic or local variable is created on entry to a method and has … Read more

Ans: So that it can be invoked without creating an instance of that class. In Java, the main method is required for the execution of a Java program. The main method serves as the entry point for the Java Virtual Machine (JVM) to start the execution of the program. To understand why the main method … Read more

Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints imposed by each windowing system. When Java programmers don’t use layout managers, they often encounter several problems related to the positioning and sizing … Read more