static methods in Java

A static method is any method that has been declared using static keyword  . For example static void sumTotal(int x,int y) { i...

A static method is any method that has been declared using static keyword .For example

static   void sumTotal(int x,int y)
    {
    int total=x+y;
    System.out.println("Total is " +total);
    }

Characteristics of static methods.

• static method can be invoked without creating class instance.
• static method has access to static variables and can change their values.
• static method belongs to the class rather than object .

Questions on static methods

1.Can a non-static method be called inside a static method?

non-static methods cannot be called or invoked inside a static method.

Try compiling below code.

/**
 *
 * @author Eric
 * www.techoverload.net
 */
public class Sum {
  void sumTotal(int a,int b,int c)
    {
    int total=a+b+c;
    System.out.println("Total is " +total);
    }
    
  
    public static void main(String args [])
    {
   
    sumTotal(123,23,67);//referencing non-static method inside a static method.
    
    }
    
}

Output

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - non-static method sumTotal(int,int,int) cannot be referenced from a static context

Then try this 

/**
 *
 * @author Eric
 * www.techoverload.net
 */
public class Sum {
  static void sumTotal(int a,int b,int c)//static method
    {
    int total=a+b+c;
    System.out.println("Total is " +total);
    }
    
  
    public static void main(String args [])
    {
   
    sumTotal(123,23,67);//referencing static method inside a static method.
    
    }
    
}

Output

run:

Total is 213

BUILD SUCCESSFUL (total time: 0 seconds)