Java Core Interview Questions and Answers. Tech interviewer’s notes
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About this ebook
This book contains 80 Java Technical interview questions that you can expect in a Java interview. Each question is accompanied with an answer so that you can prepare for job interview in short time. You do not have to spend time searching the Internet for Java interview questions. Basic to expert level Java interview questions that an interviewer asks are here. I know it, I am an interviewer. At the end of the ebook I added solution to Robot Simulator coding task.
John Edward Cooper Berg
John is a software engineer, designer, architect, tech lead and technical recruiter with over 14 years of professional experience. Since 2012 he lives in Melbourne in Australia. He is passionate about software development and ways to make it better. When John is not on regular projects, he is spending time learning and investigating new technologies. John is a Udemy instructor.
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Java Core Interview Questions and Answers. Tech interviewer’s notes - John Edward Cooper Berg
Static keyword can be used with class, variable, method and block. Static members belong to the class instead of a specific instance, this means if you make a member static, you can access it without object.
Static block is used for initializing static variables. This block gets executed when the class is loaded in the memory. A class can have multiple static blocks, which will execute in the same sequence they have been written in the class.
class JavaExample{
static int number;
static String myString;
static {
number = 123;
myString = Java
;
}
public static void main(String args[]){
System.out.println(Value of number:
+ number);
System.out.println(Value of myString:
+ myString);
}
}
A static variable is common to all the instances of the class because it is a class level variable. Only a single copy of static variable is created and shared among all the instances of the class. Memory allocation for such variables only happens once when the class is loaded in the