Java Basics

Java Basics

Language Basics

Variables

We can say that there are two main types of fields or variables used within a ava code:

  1. Instance Variables (Non-Static Fields): Instance variables (non-static variables) within a class are created at run-time, meaning that we declare them inside the class and if their values changed it will be reflected inside the same class only and will affect other classes.

  2. static field: are fields that are shared and used by all the objects and loaded when class is loaded. you declare one at the main class and use it with every copy.

 

Operators

Operators are special symbols that perform specific operations on one, two, or three operands, and then return a result. source

op

 

Expressions, Statements, and Blocks

Expressions are lines of code contain variables and operators, work together to bring out a result, for example:

1 + 2

this is an expressions that uses the operator “+” to generate a new value.

Statements are a complete line of code than when we run it, we can have a final result and we alwa send it with a semicolon “;”

int result = 1 + 2;

Blocks is a group of more than one statements between balanced braces.

class BlockDemo {
public static void main(String[] args) {
boolean condition = true;
if (condition) { // begin block 1
System.out.println(“Condition is true.”);
} // end block one
else { // begin block 2
System.out.println(“Condition is false.”);
} // end block 2
}
}

 

Compiling

Compiling simply means is to stick to the languages rules (syntax) so your machine can correctly read the instruction you wrote without any errors.

 

Reading Java Documentation

If you needed a refrence while coding with java, you can always go to stack overflow…, just kidding, you can always go here, the Oracle documentation for java and search for anything you need. by going to the “Index” option and search for a key word for the method you are searching for and you will easly get the results.

   

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