Returning Multiple values in Java
Java doesn’t support multi-value returns. We can use following solutions to return multiple values.
If all returned elements are of same type
We can return an array in Java. Below is a Java program to demonstrate the same.
// A Java program to demonstrate that a method // can return multiple values of same type by // returning an array class Test { // Returns an array such that first element // of array is a+b, and second element is a-b static int [] getSumAndSub( int a, int b) { int [] ans = new int [ 2 ]; ans[ 0 ] = a + b; ans[ 1 ] = a - b; // returning array of elements return ans; } // Driver method public static void main(String[] args) { int [] ans = getSumAndSub( 100 , 50 ); System.out.println( "Sum = " + ans[ 0 ]); System.out.println( "Sub = " + ans[ 1 ]); } } |
Output:
Sum = 150 Sub = 50
If returned elements are of different types
Using Pair (If there are only two returned values)
We can use Pair in Java to return two values.
// Returning a pair of values from a function import javafx.util.Pair; class GfG { public static Pair<Integer, String> getTwo() { return new Pair<Integer, String>( 10 , "w3wiki" ); } // Return multiple values from a method in Java 8 public static void main(String[] args) { Pair<Integer, String> p = getTwo(); System.out.println(p.getKey() + " " + p.getValue()); } } |
If there are more than two returned values
We can encapsulate all returned types into a class and then return an object of that class.
Let us have a look at the following code.
// A Java program to demonstrate that we can return // multiple values of different types by making a class // and returning an object of class. // A class that is used to store and return // three members of different types class MultiDivAdd { int mul; // To store multiplication double div; // To store division int add; // To store addition MultiDivAdd( int m, double d, int a) { mul = m; div = d; add = a; } } class Test { static MultiDivAdd getMultDivAdd( int a, int b) { // Returning multiple values of different // types by returning an object return new MultiDivAdd(a * b, ( double )a / b, (a + b)); } // Driver code public static void main(String[] args) { MultiDivAdd ans = getMultDivAdd( 10 , 20 ); System.out.println( "Multiplication = " + ans.mul); System.out.println( "Division = " + ans.div); System.out.println( "Addition = " + ans.add); } } |
Output:
Multiplication = 200 Division = 0.5 Addition = 30
Returning list of Object Class
// Java program to demonstrate return of // multiple values from a function using // list Object class. import java.util.*; class GfG { public static List<Object> getDetails() { String name = "Geek" ; int age = 35 ; char gender = 'M' ; return Arrays.asList(name, age, gender); } // Driver code public static void main(String[] args) { List<Object> person = getDetails(); System.out.println(person); } } |
Output:
[Geek, 35, M]
This article is contributed by Twinkle Tyagi.
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