import java.util.ArrayList; import java.util.Collections; public class Main { public static void main(String[] args) { ArrayList<String> arrayList = new ArrayList<String>(); arrayList.add("A"); arrayList.add("B"); arrayList.add("D"); System.out.println(arrayList); Collections.fill(arrayList, "REPLACED"); System.out.println(arrayList); } } /* [A, B, D] [REPLACED, REPLACED, REPLACED] */