LongStream max() in Java with examples

java.util.stream.LongStream in Java 8, deals with primitive longs. It helps to solve the problems like finding maximum value in array, finding minimum value in array, sum of all elements in array, and average of all values in array in a new way. LongStream max() returns an OptionalLong describing the maximum element of this stream, or an empty optional if this stream is empty.

Syntax :

OptionalLong() max()

Where, OptionalLong is a container object which 
may or may not contain a long value.

Example 1 :

// Java code for LongStream max()
import java.util.*;
import java.util.stream.LongStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // creating a stream
        LongStream stream = LongStream.of(-9L, -18L, 54L,
                                          8L, 7L, 14L, 3L);

        // OptionalLong is a container object
        // which may or may not contain a
        // long value.
        OptionalLong obj = stream.max();

        // If a value is present, isPresent() will
        // return true and getAsLong() will
        // return the value
        if (obj.isPresent()) {
            System.out.println(obj.getAsLong());
        }
        else {
            System.out.println("-1");
        }
    }
}

Output :

54

Example 2 :

// Java code for LongStream max()
// to get the maximum value in range
// excluding the last element
import java.util.*;
import java.util.stream.LongStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // To find maximum in given range
        LongStream stream = LongStream.range(50L, 75L);

        // storing the maximum value in variable
        // if it is present, else show -1.
        long maximum = stream.max().orElse(-1);

        // displaying the maximum value
        System.out.println(maximum);
    }
}

Output :

74

Example 3 :

// Java code for LongStream max()
// to get the maximum value in range
// excluding the last element
import java.util.*;
import java.util.stream.LongStream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // To find maximum in given range
        LongStream stream = LongStream.range(50L, 50L);

        // storing the maximum value in variable
        // if it is present, else show -1.
        long maximum = stream.max().orElse(-1);

        // displaying the maximum value
        System.out.println(maximum);
    }
}

Output :

-1