methods and constructors in java

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Methods and constructors in java

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Week Target Achieved

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2 27 30

3 35 29

Typing Speed

Jobs Applied# Company Designation Applied Date Current Status

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MethodoA Java method is a collection of

statements that are grouped together to perform an operation

oA class without method has no life,the object created by such class cannot respond to any message

oMethods are declared inside the body of the class but immediately after the declaration of the instance variable

Method declaration

Type methodname(parameter_list){

Method_body;}

Eg:Class rectangle{int length, width;Void getData(int x,int y){Length=x;Width=y;}}

class sum {

void sum(int a,int b){System.out.println( (a+b));}void sum(int a,int b,int c){System.out.println( (a+b+c));}public static void main(String args[]){sum obj=new sum();obj.sum(10,5);obj.sum(10,5,10);}

}

Constructor:oObject we created must be given to instial

valuesoWe have done earlier using two approaches

1 Dot operator:access the instance variable and assign value them indiviidualy

2 getData method:intialise each object individually

it would be simpler to initialise an object when it’s first created _special type of method is called construcor

• Constructor have the same name as the class itself

• They do not specify any return type not even void

• class Constructor Demo{ Constructor Demo(){ System.out.println("Inside no argument constructor"); } ConstructorDemo(String name){ System.out.println("Inside one argument constructor in Java with name: " + name); }

public static void main(String args[]) { Constructor Demo d = new ConstructorDemo(); //calling no argument constructor in java Constructor Demo e = new ConstructorDemo("Testing"); //calling one argument constructor in java }}

• Output:Inside no argument constructorInside one argument constructor in Java with name: Testing

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