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Top 3 Examples of variable arguments| varargs feature in java


java variable arguments java variable arguments in methods: Learn with syntax and examples.

What are Variable Arguments in java

Variable arguments feature is one of the java language feature introduced in Java5.

Java5 introduced a lot of new features like the Enum feature[] etc.

Before Java5, methods can have multiple arguments, but the number of arguments is fixed.

With Java5, the method can have multiple parameters (zero to many) to be supplied without having to define many arguments by specifying variable argument syntax.

An ellipse (…) is used to specify variable arguments in method definitions.

Java has a feature of method overloading in which the same method can have different versions with changing arguments.

Varargs Advantages in java

  • variable declaration not required at compile time or runtime.
  • Clients have complete flexibility over sending variable arguments to Service API methods, and older Java versions are supported.

Variable argument syntax

We have to declare DataType and … arguments in the method declaration.

public void method(DataType … arguments)

The ellipsis(…) follows just after arguments. As a result, this method accepts a minimum of zero arguments and a maximum of multiple arguments.

Variable arguments Rules

1. Varargs can be combined with other normal arguments.
2. Only one varargs in any method declaration
3. If there are both varargs and standard arguments, the varargs declaration should come last.

How JVM Execution for varargs

when the variable argument is declared in the method, the java compiler of JVM loads that method and create an array of arguments of Data type

Varargs Simple example

package com.cloudhadoop.varargs;

public class VarargsExample {

    static void print(String... words) {
        String sentence = null;
        for (String word : words) {
            sentence = sentence + word;
        }
        System.out.println(" " + sentence);
    }

    public static void main(String[] args) {
        print("Hi", "How ", "are", "You");
    }

}  

output:

Hi How are you  

How to iterate Variable arguments in java example

Variable arguments variable name is a reference to an array of argument of the specified type. therefore, we can use use for loop to iterate variable arguments.

public class VarargsExample {
    static void print(String... words) {
        String sentence = null;
        for (String word : words) {
            sentence = sentence + word;
        }

    public static void main(String[] args) {
        print("Hi", "How ", "are", "You");
    }

}

Conclusion

In this tutorial, learned variable arguments with examples for How to iterate Variable arguments in java example How JVM Execution for varargs rules advantages.

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