Varargs

[srinivas.b]

Hi,

Can any one explain why varargs is considers as array ?

Ex: O/P- varargs

public class MyVarargs {

public static void main(String... args) {

System.out.println("varargs");
}

}

[srinivas.b]

Addition to the above mail
what is the main purpose of varargs?

[Jesper de Jong]

Can any one explain why varargs is considers as array ?

There's no special logical reason, that's just how the designers of the Java language decided to implement it.

what is the main purpose of varargs?

Sometimes you want a method with a variable number of arguments in a program. One example of this is the method String.format() (look it up in the API documentation). Before varargs, if you wanted to pass a variable number of arguments to a method, you could do that with an array:

public void myMethod(Object[] args) {
    // ...do something with the arguments
}
 
public void otherMethod() {
    myMethod(new Object[]{ "Jesper", 97 });
    myMethod(new Object[]{ "JavaRanch", 12, 354, "Hello" });
}

But that syntax is quite cumbersome - you'll have to create a new Object[] each time. With varargs, you can write code that is shorter and more clear.

public void myMethod(Object... args) {
    // ...do something with the arguments
}
 
public void otherMethod() {
    myMethod("Jesper", 97);
    myMethod("JavaRanch", 12, 354, "Hello");
}