JAVA

java indexof array

java.util.Arrays.asList(theArray).indexOf(o)

indexof an array in java

import java.util.ArrayList;

class Main {
    public static void main(String[] args) {
        // create an ArrayList
        ArrayList<Integer> numbers = new ArrayList<>();

        // insert element to the arraylist
        numbers.add(22);
        numbers.add(13);
        numbers.add(35);
        System.out.println("Number ArrayList: " + numbers);

        // find the position of 13
        int position1 = numbers.indexOf(13);
        System.out.println("Index of 13: " + position1);

        // find the position of 50
        int position2 = numbers.indexOf(50);
        System.out.println("Index of 50: " + position2);
    }
}

index of function in java for array

// Java program to find index of
// an element in N elements
import java.util.stream.IntStream;
public class index {
  
    // Function to find the index of an element
    public static int findIndex(int arr[], int t)
    {
        int len = arr.length;
        return IntStream.range(0, len)
            .filter(i -> t == arr[i])
            .findFirst() // first occurrence
            .orElse(-1); // No element found
    }
    public static void main(String[] args)
    {
        int[] my_array = { 5, 4, 6, 1, 3, 2, 7, 8, 9 };
        System.out.println("Index position of 5 is: "
                           + findIndex(my_array, 5));
        System.out.println("Index position of 7 is: "
                           + findIndex(my_array, 7));
    }
}

java array get index

 public int getArrayIndex(int[] arr,int value) {

        int k=0;
        for(int i=0;i<arr.length;i++){

            if(arr[i]==value){
                k=i;
                break;
            }
        }
    return k;
}