Java Tutorial 7 – passing arguments and returning values

Passing arguments between methods is very easy.

lets use class1 and class2 that we created before.

and change class1 to :

public class class1 {
public static void main(String[] args) {

Class2 c2object= new Class2();
c2object.boy(“Yash”);
c2object.girl(“sweety”);
}

}

and Class2 :

public class Class2 {

public void girl(String name){
System.out.println(name + ” is present”);
}

public void boy(String name){
System.out.println(name + ” is present”);
}
}

Here we have changed

public void boy()

to

public void boy(String name)

so now every time we call boy method it takes a string, see we have passed a string in boy(“Yash”) in class 1.

1. boy(“yash”) passes a string to boy function.
2. this string is cached into the String name in class 2.
3. then we used name to print a line.

You can also pass int, double etc. but when you pass an int you must define other int in definition of method to catch that int.

for example:

public static void main(String[] args){

add(12,13);

public static void add(int x, int y){

System.out.println(x+y);

}

}

we have passed two arguments and cached it in int x and y and used it to display sum.

Returning values:

to return value just add one line at bottom of method called “return (variable)”

in above example we can return the sum like this way:

public static void main(String[] args){

int ans;

ans = add( 12, 13 );

System.out.println(ans);

public static int add(int x, int y){

return (x+y);

}

}

what we have done here is , we simply get 2 int in method and returned the addition of them.

now notice that we have changed public static void add(int x, int y) to public static int add(int x, int y)

it is because now our method returns an int.

same way if your method returns double or String method would be public static double add(int x, int y)

and in class 1 we written ans = add( 12, 13 ) here ans is the variable which will store the returned value.

same way if you returns a String you must have String variable to store it instead of int ans.

In next tutorial we will learn how to pass Objects between methods.

Java Tutorial 5 – Creating methods

We have used system defined methods like println() and nextInt(), Now let’s create our own method and use it.

Defining method is very useful when bunch of code is getting repeated,  just put that code in a method and just call that method instead of writing all the code again

create a class and add this code as always we do.

1. Why int and Scanner before main method? 

   if we create int inside the main method, then, only main method can use or change that int. so defining anything in the class and outside any method is called Global declaration.

2. Why Static?
   to use that int into the main or any other method because main itself is static so any variable used within it must be static and thats why we also crated all the methods static.

We created 3 methods and it can be defined anywhere in the class.Observe the out put and you will dig out everything.

u can create different methods of adding subtracting etc. and create  calc.

Doubts invited,

Have a nice day, Peace.