arrayList的使用

xiaoxiao2021-03-25 84

import java.util.ArrayList; import java.util.Iterator; public class ArrDemo { public static void main(String[] args) { ArrayList<String> arrayList = new ArrayList<>(); arrayList.add("one"); arrayList.add("one"); arrayList.add("four"); arrayList.add(null); arrayList.addAll(arrayList); System.out.println(arrayList); System.out.println(arrayList.get(0)); System.out.println(arrayList.contains(null)); Iterator<String> iterator = arrayList.iterator(); while (iterator.hasNext()) { String string = (String) iterator.next(); System.out.println(string); } } }

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