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PROBLEM SOLVING AND PYTHON PROGRAMMING QUIZ

1) What is the first step in problem-solving? A) Writing code B) Debugging C) Understanding the problem D) Optimizing the solution Answer: C 2) Which of these is not a step in the problem-solving process? A) Algorithm development B) Problem analysis C) Random guessing D) Testing and debugging Answer: C 3) What is an algorithm? A) A high-level programming language B) A step-by-step procedure to solve a problem C) A flowchart D) A data structure Answer: B 4) Which of these is the simplest data structure for representing a sequence of elements? A) Dictionary B) List C) Set D) Tuple Answer: B 5) What does a flowchart represent? A) Errors in a program B) A graphical representation of an algorithm C) The final solution to a problem D) A set of Python modules Answer: B 6) What is pseudocode? A) Code written in Python B) Fake code written for fun C) An informal high-level description of an algorithm D) A tool for testing code Answer: C 7) Which of the following tools is NOT commonly used in pr...

Java important question - 13

What are the ways to initialize a final variable ?
          We must initialize a final variable, otherwise compiler will throw compile time error. A final variable can only be initialize once, either via an initializer or an assignment statement. There are three ways to initialize a final variable,
1) You can initialize a final variable when it is declared. This approach is most common. A final variable is called blank final variable, if it is not initialized while declaration. Below are the two ways to initialize a blank final variable.
2) A blank final variable can be initialized inside constructor. If you have more than one constructor in your class then it must be initialized in all of them, otherwise compile time error will be thrown.
3) A blank final static variable can be initialized inside static block.

What is the difference between transient and volatile variable in Java ?
Transient:
          In Java, it is used to specify the variable is not being serialized. Serialization is the process of saving an object's state in Java. When we want to persist the object's state by default, all instance variables in the object are stored. In some cases, if we want to avoid persisting few variables, declare those variables as transient. If the variable is confirmed as transient, then it will not be persisted. Transient keyword is used with that instance variable which will not participate in the serialization process.
Volatile :
          Volatile modifier tells the compiler that the variable modified by volatile can be changed expectedly by other parts of the program, so writes to the field should always be synchronously flushed to memory, and that reads of the field should always read from memory. Any threads using that variable are not allowed to cache that value at all. This means that fields marked as volatile can be safely acrossed and updated in a multithread application without using native or standard library-based synchronization.

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