get index of element in array java

1java.util.Arrays.asList(theArray).indexOf(o)

1System.out.println(new String(list).indexOf("e")); 
2

1 public int getArrayIndex(int[] arr,int value) {
2
3        int k=0;
4        for(int i=0;i<arr.length;i++){
5
6            if(arr[i]==value){
7                k=i;
8                break;
9            }
10        }
11    return k;
12}
13

1public class Exercise6 {
2       public static int  findIndex (int[] my_array, int t) {
3        if (my_array == null) return -1;
4        int len = my_array.length;
5        int i = 0;
6        while (i < len) {
7            if (my_array[i] == t) return i;
8            else i=i+1;
9        }
10        return -1;
11    }
12    public static void main(String[] args) {
13      int[] my_array = {25, 14, 56, 15, 36, 56, 77, 18, 29, 49};
14      System.out.println("Index position of 25 is: " + findIndex(my_array, 25));
15      System.out.println("Index position of 77 is: " + findIndex(my_array, 77));
16       }
17}
18
19

1public class compareArray{
2  public static void main(String[] args){
3    
4    int[a] = {1,4,5,7};
5    int[b] = {6,4,3,7};
6    
7    
8    int[] ab = new int[4];
9    
10    
11    for(int i = 0; i<a.length; i++; )
12    {   
13      if(a[i] == b[i])
14       { 
15        int[] ab = new int[4];
16        
17        Arraylist<Integer> al = new Arraylist<Integer>();
18        
19        for(int i = 0; i < a.length; i++; )
20          
21          if(a[i] == b[i])
22            
23          {  
24            al.add(a[i]);  
25                            }   
26                                  }
27      		Object[] c= al.toArray();
28      			
29      for(Object ob : c)
30      {
31        System.out.println(obj);
32      }