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One efficient method for converting an ArrayList to a String in Java is to use the built-in String.join() method with a delimiter. For example:
ArrayList<String> list = new ArrayList<String>();
list.add("Hello");
list.add("World");
String string = String.join(", ", list);
This will create a string that concatenates all the elements in the ArrayList separated by the delimiter ", ". In this example, the resulting string would be "Hello, World".