Example 1: Check if Int Array contains a given value
class Main { public static void main(String[] args) { int[] num = {1, 2, 3, 4, 5}; int toFind = 3; boolean found = false; for (int n : num) { if (n == toFind) { found = true; break; } } if(found) System.out.println(toFind + " is found."); else System.out.println(toFind + " is not found."); } } Output
3 is found.
In the above program, we have an array of integers stored in variable num. Likewise, the number to be found is stored in toFind.
Now, we use a for-each loop to iterate through all elements of num and check individually if toFind is equal to n or not.
If yes, we set found to true and break from the loop. If not, we move to the next iteration.
Example 2: Check if an array contains the given value using Stream
import java.util.stream.IntStream; class Main { public static void main(String[] args) { int[] num = {1, 2, 3, 4, 5}; int toFind = 7; boolean found = IntStream.of(num).anyMatch(n -> n == toFind); if(found) System.out.println(toFind + " is found."); else System.out.println(toFind + " is not found."); } } Output
7 is not found.
In the above program, instead of using a for-each loop, we convert the array to an IntStream and use its anyMatch() method.
anyMatch() method takes a predicate, an expression, or a function that returns a boolean value. In our case, the predicate compares each element n in the stream to toFind and returns true or false.
If any of the element n returns true, found is set to true as well.
Example 3: Check if an array contains a given value for non-primitive types
import java.util.Arrays; class Main { public static void main(String[] args){ String[] strings = {"One","Two","Three","Four","Five"}; String toFind= "Four"; boolean found = Arrays.stream(strings).anyMatch(t -> t.equals(toFind)); if(found) System.out.println(toFind + " is found."); else System.out.println(toFind + " is not found."); } } Output
Four is found.
In the above program, we've used a non-primitive data type String and used Arrays's stream() method to first convert it to a stream and anyMatch() to check if the array contains the given value toFind.