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Java Basic Syntax
The document provides guidelines for naming conventions in Java including capitalization rules for class and method names, requirements for the main method, how to compile and run a Java program, that Java is case sensitive, naming the program file to match the class, identifiers in Java, Java keywords, single and multi-line comments, and blank lines. Key points covered include uppercase first letters for class names, lowercase first letters for method names, the main method must be public and static, and examples are provided for class and file names.
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Classes should have upper camel case names like MyFirstJavaExample. Method names must start with a lowercase letter, exemplified by myMethodName.
A Java application contains a main method, which must be public and static for execution without an object.
To execute HelloWorld.java, compile it using 'javac HelloWorld.java' and run with 'java HelloWorld'.
Java is case-sensitive; 'HelloWorld' and 'helloworld' are different. Ensure correct casing in commands and file names.
The program file name must match the class name and end with '.java', e.g., 'HelloWorld.java'.
Identifiers are names for classes, variables, and methods. Java keywords like 'abstract' and 'class' are reserved and cannot be used.
Java supports single-line and multi-line comments, with all characters in comments ignored. Blank lines are also ignored.
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Java Basic Syntax
- 1. Class Name first lettershould be in Upper Case If several words are used to form a name of the class each inner words first letter should be in Upper Case. Ex: MyFirstJavaExample
- 2. Method Name All methodnames should start with a Lower Case letter. Ex: public void myMethodName( )
- 3. Java Application is aJava class having main method
- 4. main method should bepublic – Class loader need to access this method should be static – method would be executed without an object
- 5.
- 6. ● Compile thecode – javac HelloWorld.java ● Run the code – java HelloWorld
- 7. Java is CaseSensitive ● Both the compiler (javac) and launcher (java) are case- sensitive. ● Type all code, commands, and file names exactly as shown. – HelloWorld is not the same as helloworld
- 8. Program File Name Nameof the program file should exactly match the class name. When saving the file you should save it using the class name and append ‘.java’ to the end of the name. Example : class ‘HelloWorld’ should be saved in file ‘HelloWorld.java’
- 9. Java Identifiers All javacomponents require names. Names used for classes, variables and methods are called identifiers.
- 10. Java Keywords These arereserved words and may not be used as constant or variable or any other identifier names. Examples: abstract, boolean, break, byte, class, package etc.
- 11. Comments in Java Javasupports single line and multi-line comments very similar to c and c++. All characters available inside any comment are ignored by Java compiler.
- 12. Using Blank Lines Aline containing only whitespace is known as a blank line, and Java ignores it.