Tutorial On Method With Example In Java

First of all I would like to discuss about a simple method simple method in java consist of a following six components some are necessary and some are optional.

• Modifier(Public/private) method declaration must be start with this component.
• Return type its necessary part of an method if method does not have any return type then void should be used.
• MethodName Programmer can use any name for method accept ut can not be reserved keyword or name of method should not be same with class name.
• ParameterList After name of method input parameter list should be defined in () seperated by comma with their data types if their is no input data () must be empty.
• Exception list is to be define that throws by a method this part is optional depending upon situation of program.
• Braces({}) without this part program will not compile this is an necessary part of an method.

EXAMPLE OF SIMPLE METHOD IN JAVA:

class current

{

double current;

double resistance;

public void display()

{

System.out.println("current="+current);

System.out.println("resistance="+resistance);

System.out.println("voltage="+resistance*current);

}

}

class voltage

{

public static void main(String args[])

{

//Creating Object Of current 

current cur=new current();

//assiging value of current and resistance in instance variablecur.current=3;

cur.resistance=100;

cur.current=10;

//calling method to display voltage

cur.display();

}
}

EXPLANATION:

EXAMPLE OF METHOD THAT TAKES PARAMETER:

class current

{

double current;

int resistance;

public void display(double cur,int resis)

{

current=cur;

System.out.println("current="+current);

resistance=resis;

System.out.println("resistance="+resistance);

System.out.println("voltage="+resistance*current);

}

}

class voltage

{

public static void main(String args[])

{

//Creating Object Of current 

current x=new current();

//calling method

x.display(50,5);

}

}

EXPLANATION: