Java Class Methods

Methods called on a class rather than a specific object instance are known as class methods. The static modifier guarantees uniform implementation across all instances of the class.

Syntax

public class NameOfClass {
    access_modifier static return dataType methodName ( inputParameters ) { 
//static method
         //block of code to be executed
    }
}
//calling the method
NameOfClass . methodName ( passedParams ) ;

When MethodName() is called, the action is printed. Write the name of the method, two parenthesis (), and a semicolon (;) to call the method;

Class Methods

Data used by the method and kept in variables are contained in parameters. The definition of a parameter is (dataType parameterName), which specifies the input parameter's data type and its name as it appears in the method. A comma can be used to separate numerous arguments.

The programmer defines the method name, the data type of the output that results from invoking the method, and the access modifier. The procedure is further modified to become static via the term "static".

No instantiation is required to call static methods. Because other members of the class are object members, static methods can only access other static members of the class. They can, however, be called on an item, but this is not advised.

Program

ClassMethod.java

public class ClassMethod {
    // static method declaration 
  static void method ( ) {
    System . out . println ( " Hi ,Everyone " ) ;
    // prints " Hi ,Everyone "
  }
  // Main method of the program where execution starts
  public static void main ( String [ ] s ) {
    method ( ) ;
  }
}

Output

Hi ,Everyone

In contrast to public methods, which can only be accessible by objects, we built static methods, which can be used without first constructing an object of the class.

Static Vs Public

public class Main {
  // Declaration of static method 
  // static methods can be accessed without the help of objects
  static void StaticMethod ( ) {
    System . out . println(" static methods can be accessed without the help of objects " ) ;
  }


  // Declaration of public method
  // public methids can only be accessed by objects
  public void PublicMethod ( ) {
    System . out . println ( " public methids can only be accessed by objects " ) ;
  }


  // Main method of the program where execution starts
  
  public static void main ( String [ ] s )
  {
    StaticMethod ( ) ; // Calling static method
    // myPublicMethod(); //If public method is called directly it causes error
     // Main.java:19: error: not a statement
    // myPublicMethod(); If public method is called directly it causes error


    Main o1 = new Main ( ) ; // creating the object for class 
    o1 . PublicMethod ( ) ; // Calling  the public method by  object
  }
}

Output

static methods can be accessed without the help of objects 
 public methids can only be accessed by objects

Method Access Using an Object

public class Main {
  public void Throttle ( ) {
    System . out . println ( " The vehicle is moving as quickly as it can " ) ;
  }


  // Add a parameter and create the speed() method.
  public void Speed ( int maxSpeed ) {
    System . out . println ( " Max speed is: " + maxSpeed ) ;
  }
    // Main method of the program where execution starts
  public static void main ( String [ ] args ) {
    Main c1 = new Main ( ) ;   // Create a c1 object
    c1 . Throttle ( ) ;      // Call the Throttle() method
    c1 . Speed ( 200 ) ;          // Call the speed() method
  }
}

Output

The vehicle is moving as quickly as it can 
 Max speed is: 150

Standard Library Methods

The built-in, easily accessible methods in Java's standard library are called standard library methods. The Java Class Library (JCL) and these standard libraries are included in a Java archive (*.jar) file along with JVM and JRE.

Example

1. print() method is in java.io.*;

2.A Math class method is sqrt(). It gives back a number's square root.