Java如何检查List 里是否有想要的字符串?
List<String> test = new ArrayList<String>(); test.add("a"); test.add("b"); test.add("c"); System.out.println(test.contains("a"));
List<String> test = new ArrayList<String>(); test.add("a"); test.add("b"); test.add("c"); System.out.println(test.contains("a"));