方式一：使用Iterator的remove()方法

public class Test {public static void main(String[] args) {List<String> list = new ArrayList<>();list.add("aa");list.add("bb");list.add("cc");Iterator<String> it = list.iterator();while(it.hasNext()){String str = (String)it.next();if("aa".equals(str)){it.remove();}        }System.out.println(list.size());}
}

方式二：使用List的remove()方法，注意list.size()的位置

public class Test {public static void main(String[] args) {List<String> list = new ArrayList<>();list.add("aa");list.add("bb");list.add("cc");for (int i = list.size() - 1; i >= 0; i--) {String str = list.get(i);if ("aa".equals(str)) {list.remove(str);}}System.out.println(list.size());}
}

方式三：使用CopyOnWriteArrayList

public class Test {public static void main(String[] args) {List<String> list = new ArrayList<>();list.add("aa");list.add("bb");list.add("cc");CopyOnWriteArrayList<String> cowList = new CopyOnWriteArrayList<String>(list);for (String str : cowList) {if ("aa".equals(str)) {cowList.remove(str);}}System.out.println(cowList.size());}
}