Returning Multiple values in Java

13 Sep, 2018
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 arrayclass 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]);    }}
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 functionimport javafx.util.Pair;  class GfG {    public static Pair<Integer, String> getTwo()    {        return new Pair<Integer, String>(10, "GeeksforGeeks");    }      // 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 valuesWe 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 typesclass 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);    }}
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);    }}
[Geek, 35, M]

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