1 public class testList { 2 public static void main(String[] args){ 3 java.util.Listls = new java.util.ArrayList<>(); 4 ls.add("A"); 5 ls.add("B"); 6 ls.add("C"); 7 String[] str = {"A","B","C","D"}; 8 for(int i=0;i set = new java.util.TreeSet<>(ls);12 java.util.List lsr = new java.util.ArrayList<>();13 lsr.addAll(set);14 System.out.println(lsr.toString());15 }16 }
打印结果:[A, B, C, D]