int[] numbers = {10,20,30,40,50};
        
        
        String[] indexElements = IntStream.range(0, numbers.length).mapToObj(i -> i + ":" + numbers[i]).toArray(String[]::new);

        System.out.println(" "+ Arrays.toString(indexElements));


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        int[] numbers = {10,20,30,40,50};
    
      int sum = IntStream.of(numbers).sum();

        System.out.println(" "+ sum);