判断以逗号分隔的字符串中是否包含某个数

@Test
public void test2222(){
String ids = "1,2,3,45,35";
String[] values = ids.split(",");
List<String> list = Arrays.asList(values);
if(list.contains("4")){
System.out.println("true");
}else {
System.out.println("false");
}
}