解决for循环为空不需要判断的问题

public class testData {
  public static void main(String[] args) {
    List<String> list = new ArrayList<>();
    for ( String str:list){
      System.out.println("11");
    }
    for (int i = 0; i < list.size(); i++) {
      System.out.println("22");
    }
    list=null;
    for ( String str:list){
      System.out.println("11");
    }
    for (int i = 0; i < list.size(); i++) {
      System.out.println("22");
    }
  }
}

List<String> list = null;
for (String str : list) {
   System.out.println(str);
}