Arrays.stream in java

Arrays.stream in java

  January 22, 2018    

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We are having few methods by which we can directly get result using Arrays.stream


average()
max()
min()
sum()
findFirst()
findAny()
reduce((x,y)->x+y)
getAsInt() : convert value in Int
getAsDouble() : convert value in Double
Arrays.stream(arr_sample1)
            .asLongStream()

            .forEach(e->System.out.print(e + " "));


Arrays.stream(arr_sample1).findAny().getAsInt()

IntPredicate predicate = e->e % 11 == 0;
        System.out.println(Arrays.stream(arr_sample2).anyMatch(predicate));

Arrays.stream(arr_sample4) .allMatch(e->e % 2 == 0)

Arrays.stream(arr_sample4).noneMatch(e->e % 2 == 0)


Example:

public static void main(String[] args)
{
int arr_sample1[] = { 11, 2, 3, 6 };

// average()
// This method returns a average of an array
System.out.println("Example of average() : ");
System.out.println((Arrays.stream(arr_sample1)
.average()));

// findAny()
// It can return any value from the stream
// Most of the time it returns the first value 
// but it is not assured it can return any value
System.out.println("Example of findAny() : ");
System.out.println(Arrays.stream(arr_sample1)
.findAny());

// findFirst()
// It returns the first element of the stream
System.out.println("Example of findFirst() :");
System.out.println(Arrays.stream(arr_sample1)
.findFirst());

// max()
// It returns the max element in an array
System.out.println("Example of max() :");
System.out.println(Arrays.stream(arr_sample1)
.max());

// min()
// It returns the max element in an array
System.out.println("Example of max() :");
System.out.println(Arrays.stream(arr_sample1)
.min());

// reduce()
// It reduces the array by certain operation
// Here it performs addition of array elements
System.out.println("Example of reduce() :");
System.out.println(Arrays.stream(arr_sample1)
.reduce((x, y)->x - y));

// reduce() have another variation which we will
// see in different example
}