List<String> languages = new ArrayList<>();
languages.add("Java");
languages.add("PHP");
languages.add("Python");
System.out.println(languages);
List<String> numbers = new ArrayList<>(Arrays.asList("1", "2", "3"));
numbers.add("4");
System.out.println(numbers);
List<String> itcast= Collections.nCopies(3, "itcast");
System.out.println(itcast);
List<String> itheima= new ArrayList<>(Collections.nCopies(3, "itheima"));
dogs.add("itheima");
System.out.println(itheima);
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