Tuesday, December 10, 2013

Method with return type in JAVA : Day 4



a) How Method return a value? Write necessary Syntax.

b) Write any JAVA program that takes parameters in a Method.

28 comments:

  1. *********Write any JAVA program that takes parameters in a Method.

    Source code:

    package Box;

    public class Box
    {
    public double width;
    public double depth;
    public double height;
    public Box(double width,double depth,double height)
    {
    this.width=width;
    this.depth=depth;
    this.height=height;
    }
    public double calculate()
    {
    double volume = width*depth*height;
    return volume;
    }
    public static void main(String[] args)
    {
    Box box = new Box(5,4,3);
    double volumeOfBox = box.calculate();
    System.out.println("The volume is " + volumeOfBox);
    }
    }

    ReplyDelete
  2. a))) ***How Method return a value? Write necessary Syntax.

    A method returns to the code that invoked it when it:

    1.completes all the statements in the method,
    2.reaches a return statement, or
    3.throws an exception (covered later) whichever occurs first.

    Need to declare a method's return type in its method declaration. Within the body of the method use the return statement

    to return the value.
    Any method declared void doesn't return a value. It does not need to contain a return statement, but it may do so. In such

    a case, a return statement can be used to branch out of a control flow block and exit the method and is simply used like

    this:

    return;

    If try to return a value from a method that is declared void, ir will be a compiler error.
    Any method that is not declared void must contain a return statement with a corresponding return value, like this:

    return returnValue;

    ReplyDelete
  3. b) Write any JAVA program that takes parameters in a Method.


    public class Box

    {
    public double calvol(double width,double heigth ,double depth)

    {

    return width*heigth*depth;

    }
    }


    public class Ob {

    public static void main(String[] args) {

    Box b1 = new Box();

    double vol;

    vol = b1.calvol(11,12,14);

    System.out.println("The volum is : " + vol);


    }

    }

    ReplyDelete
  4. *******a) How Method return a value? Write necessary Syntax.**********

    Solution:
    Returning value from the method: We can specify return type of the method as "primitive data type" or

    "class name". Return type can be be "void" means it does not return any value. Method can return a

    value by using "return" keyword.

    e.g. int len = R1.getLength( );

    Example of returning value from the method:

    Source code:

    package square;
    public class Square
    {
    double length;
    double width;

    void setLength(int len)
    {
    length = len;
    }

    double getLength()
    {
    return length;
    }
    }

    class SquareDemo
    {
    public static void main(String args[])
    {
    Square s1 = new Square();
    s1.setLength(20.5);
    double len = s1.getLength();

    System.out.println("Length of a Square : " + len);
    }
    }

    ReplyDelete
    Replies
    1. here is a typing mistake *void setLength(int len).....it will be *void setLength(double len)

      Delete
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