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 ]);
}
} |
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 , "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 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);
}
} |
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]
This article is contributed by Twinkle Tyagi.