index of an element in array java code example

Example 1: java indexof array

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

Example 2: get index of element in array java

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

Example 3: return matching index array java

public class compareArray{
  public static void main(String[] args){
    
    int[a] = {1,4,5,7};
    int[b] = {6,4,3,7};
    
    
    int[] ab = new int[4];
    
    
    for(int i = 0; i<a.length; i++; )
    {   
      if(a[i] == b[i])
       { 
        int[] ab = new int[4];
        
        Arraylist<Integer> al = new Arraylist<Integer>();
        
        for(int i = 0; i < a.length; i++; )
          
          if(a[i] == b[i])
            
          {  
            al.add(a[i]);  
                            }   
                                  }
      		Object[] c= al.toArray();
      			
      for(Object ob : c)
      {
        System.out.println(obj);
      }

Example 4: get index of an array element java

public class Exercise6 {
       public static int  findIndex (int[] my_array, int t) {
        if (my_array == null) return -1;
        int len = my_array.length;
        int i = 0;
        while (i < len) {
            if (my_array[i] == t) return i;
            else i=i+1;
        }
        return -1;
    }
    public static void main(String[] args) {
      int[] my_array = {25, 14, 56, 15, 36, 56, 77, 18, 29, 49};
      System.out.println("Index position of 25 is: " + findIndex(my_array, 25));
      System.out.println("Index position of 77 is: " + findIndex(my_array, 77));
       }
}