History & Features of Java

Question 1

Created in

Answer 1

1991

Question 2

Created by

Answer 2

James Gosling

Question 3

originally called

Answer 3

Oak

Question 4

Originally owned by

Answer 4

Sun Microsystems

Question 5

Later called java in

Answer 5

1995

Question 6

abstracted (doesn’t show internal), everything is in form of classes and objects

Answer 6

Object Oriented

Question 7

large bit to small bit casting

Answer 7

explicit casting

Question 8

small bit to large bit casting

Answer 8

implicit casting

Question 9

automatically deallocate/free memory unused objects

Answer 9

garbage collection

Question 10

automatically deallocated when

Answer 10

-object is referenced to another object
-out of scope determined by open close brace
-when object’s equal to null

Question 11

imaginary machine emulating software

Answer 11

JVM Java Virtual Machine

Question 12

key component of the Java platform. It’s responsible for executing Java byte code and translating it into native machine code.

Answer 12

JVM Java Virtual Machine

Question 13

Result of compilation of javac, machine language that computer understands, independent of computer hardware and OS

Answer 13

Byte code

Question 14

mechanisms and practices in place to protect Java applications from various security threats

Answer 14

Code Security

Question 15

Runs a compiled code perform class loading, code verification, and code execution. It contains a set of libraries + other files that JVM uses at runtime.

Answer 15

JRE Java Runtime Environment

Question 16

Test format of code and checks illegal code

Answer 16

Byte code Verifier

Question 17

These structures allow you to make decisions in your code based on certain conditions.

Answer 17

Decision Control Structures

Question 18

also known as loops, are used to execute a block of code repeatedly.

Answer 18

Repetition Control Structures

Question 19

a block of code that
performs a specific task

Answer 19

Method

Question 20

refers to the rules and conventions that must be followed when writing Java code

Answer 20

Basic Syntax

Question 21

are data structures used to store multiple elements of the same data type under a single name.

Answer 21

Arrays

Question 22

refers to the process of converting a value from one data type to another

Answer 22

Casting

Question 23

includes byte , short , int , long , float , double , boolean and char.

Answer 23

Primitive data types

Question 24

such as String , Arrays and Classes

Answer 24

Non-primitive data types