Java var keyword in for loop example



In this source code example, we will show you how to use var in for loops in Java.

The var keyword was introduced in Java 10. Type inference is used in var keyword in which it detects automatically the datatype of a variable based on the surrounding context.

Java var in for loop

import java.util.List;

public class Main {

    public static void main(String[] args) {

        // explicit type
        System.out.println("Explicit type:");
        for (int i = 0; i < 5; i++) {
            System.out.print(i + " ");
        }

        // using var
        System.out.println("\n\nLVTI:");
        for (var i = 0; i < 5; i++) { // 'i' is inferred of type int
            System.out.print(i + " ");
        }

        List<Player> players = List.of(new Player(), new Player(), new Player());

        System.out.println("\n\nExplicit type:");
        for (Player player : players) {
            System.out.print(player + " ");
        }

        System.out.println("\n\nLVTI:");
        for (var player : players) { // 'player' is inferred of type Player
            System.out.print(player + " ");
        }               
    }
}

class Player{
	
}

Output:

Explicit type:
0 1 2 3 4 

LVTI:
0 1 2 3 4 

Explicit type:
P89_VarForLoops.src.modern.challenge.Player@2c7b84de P89_VarForLoops.src.modern.challenge.Player@3fee733d P89_VarForLoops.src.modern.challenge.Player@5acf9800 

LVTI:
P89_VarForLoops.src.modern.challenge.Player@2c7b84de P89_VarForLoops.src.modern.challenge.Player@3fee733d P89_VarForLoops.src.modern.challenge.Player@5acf9800 

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