Syntax

-
About Java programs, it is very important to keep in mind the following points.


  • Case Sensitivity - Java is case sensitive, which means identifier Hello and hello would have different meaning in Java.
  • Class Names- For all class names the first letter should be in Upper Case.

  1. If several words are used to form a name of the class, each inner word's first letter should be in Upper Case.
  2. Example class MyFirstJavaClass
  • Method Names- All method names should start with a Lower Case letter.
  1. If several words are used to form the name of the method, then each inner word's first letter should be in Upper Case.
  2. Example public void myMethodName()
  • Program File Name - Name of the program file should exactly match the class name.
  1. When saving the file, you should save it using the class name (Remember Java is case sensitive) and append '.java' to the end of the name (if the file name and the class name do not match your program will not compile)
  2. Example : Assume 'MyFirstJavaProgram' is the class name. Then the file should be saved as 'MyFirstJavaProgram.java'.

  • public static void main(String args[]) - Java program processing starts from the main() method which is a mandatory part of every Java program.

Popular posts from this blog

Naming Conventions

-
Image
A naming convention is a rule to follow as you decide what to name your identifiers (e.g. class, package, variable, method, etc..). Different Java programmers can have different styles and approaches to the way they program. By using standard Java naming conventions they make their code easier to read for themselves and for other programmers. Cases in Java Naming Convention: Using the right letter case is the key to following a naming convention: Lowercase is where all the letters in a word are written without any capitalization (e.g., while, if, mypackage). Uppercase is where all the letters in a word are written in capitals. When there are more than two words in the name use underscores to separate them (e.g., MAX_HOURS, FIRST_DAY_OF_WEEK). CamelCase (also known as Upper CamelCase) is where each new word begins with a capital letter (e.g., CamelCase, CustomerAccount, PlayingCard). Mixed case (also known as Lower CamelCase) is the same as CamelCase except the fir...
Read more

if..else..if Loader

-
Syntax: if(condition-1) {    //Statements which will be executed if condition-1 is true } else if (condition-2) {    //Statements which will be executed if condition-2 is true } . . . . else if (condition-n) {    //Statements which will be executed if condition-n is true } else {    //Statements which will be executed if none of the conditions in condition-1, condition2,…condition-n are true. }    //Statements which will be executed always As you can see in this if-else-if ladder, conditions are evaluated from top. First condition-1 will be evaluated and if this is true, the code inside the if block will be executed. If condition-1 is false, condition-2 will be evaluated. If condition-2 is true, the code inside that else if block will be executed. If condition-2 is false, condition-3 will be evaluated. This will go on like this. If none of the conditions are true, the code inside the else block wil...
Read more

Nested if..else Statement

-
You can combine multiple if / if-else /if-else-if ladders when a series of decisions are involved. So you can make sure that your program executes certain instructions when a series of conditions are met. Syntax: if(Boolean_expression 1) { //Executes when the Boolean expression 1 is true; } if(Boolean_expression 2) { //Executes when the Boolean expression 2 is true } //Statements which will be executed always      Example: public class Test {    public static void main(String args[])    {        int x = 30;        int y = 10;        if( x == 30 )        {            if( y == 10 )            {            System.out.prin...
Read more