Identifiers in Java

title: Identifiers in Java description: Java mein identifiers kya hain aur naming rules

Identifiers woh names hain jo hum variables, methods, classes, packages ko dete hain.

Rules (Mandatory)

Letter (a-z, A-Z), underscore (_), ya dollar sign ($) se start hona chahiye
Number se start nahi ho sakta
Java keywords nahi ho sakta
Spaces allowed nahi hain
Case-sensitive hain

java exampleWoHoTech

// Valid identifiers
int age;
String _name;
double $salary;
int studentAge;

// Invalid identifiers
int 1number;    // Error: number se start
int my name;    // Error: space
int class;      // Error: keyword

Naming Conventions (Best Practices)

Type	Convention	Example
Variable	camelCase	`studentName`, `totalMarks`
Method	camelCase	`getAge()`, `calculateSalary()`
Class	PascalCase	`StudentRecord`, `BankAccount`
Constant	UPPER_CASE	`MAX_SIZE`, `PI`
Package	lowercase	`com.company.project`
Interface	PascalCase	`Runnable`, `Serializable`

Examples

java exampleWoHoTech

class StudentRecord {           // PascalCase
    String studentName;         // camelCase
    final int MAX_AGE = 100;   // UPPER_CASE constant

    void calculatePercentage() { // camelCase method
        // code
    }
}

title: Identifiers in Java description: Java mein identifiers kya hain aur naming rules

Identifiers woh names hain jo hum variables, methods, classes, packages ko dete hain.

Rules (Mandatory)

Letter (a-z, A-Z), underscore (_), ya dollar sign ($) se start hona chahiye
Number se start nahi ho sakta
Java keywords nahi ho sakta
Spaces allowed nahi hain
Case-sensitive hain

java exampleWoHoTech

// Valid identifiers
int age;
String _name;
double $salary;
int studentAge;

// Invalid identifiers
int 1number;    // Error: number se start
int my name;    // Error: space
int class;      // Error: keyword

Naming Conventions (Best Practices)

Type	Convention	Example
Variable	camelCase	`studentName`, `totalMarks`
Method	camelCase	`getAge()`, `calculateSalary()`
Class	PascalCase	`StudentRecord`, `BankAccount`
Constant	UPPER_CASE	`MAX_SIZE`, `PI`
Package	lowercase	`com.company.project`
Interface	PascalCase	`Runnable`, `Serializable`

Examples

java exampleWoHoTech

class StudentRecord {           // PascalCase
    String studentName;         // camelCase
    final int MAX_AGE = 100;   // UPPER_CASE constant

    void calculatePercentage() { // camelCase method
        // code
    }
}

Identifiers in Java

Rules (Mandatory)

Naming Conventions (Best Practices)

Examples

Continue learning this concept

Identifiers in Java

Rules (Mandatory)

Naming Conventions (Best Practices)

Examples

Continue learning this concept