Shifting Elements in an Array: Shift all elements left by one : Arrays Utilities « Collections « Java Tutorial

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2. Collections
3. Arrays Utilities

public class Main {
  public static void main(String[] argv) throws Exception {
    int[] array = { 1, 2, 3 };
    System.arraycopy(array, 1, array, 0, array.length - 1);

  }
}