int array[] = new int[4];
array[0] = 0;
array[1] = 1;
array[2] = 2;
array[3] = 2;
System.out.println(array.length); // Prints 4
System.out.println(ArrayUtils.contains(array, 3)); // Prints false
array = ArrayUtils.add(array, 3); // Add element 3 to the array
System.out.println(array.length); // Prints 5
System.out.println(ArrayUtils.contains(array, 3)); // Prints true
ArrayUtils.lastIndexOf(array, 2); // prints 3
array = ArrayUtils.removeElement(array, 1); // Remove element 1 to the array
System.out.println(array.length); // Prints 4
System.out.println(ArrayUtils.contains(array, 1)); // Prints false
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