在Java

Question

我有两个不同大小的字符串arraylists。我需要比较这两个arraylists并获取输出。但它的错误为"Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 6, Size: 6"。我需要对此错误进行哪些更改。我的代码是，

import java.util.ArrayList;
import java.util.Arrays;

public class TestCompareArrays {

    public static void main(String[] args) {

    ArrayList<String> arr1 = new ArrayList<String>(Arrays.asList("a","b","c","d","e","f"));
    ArrayList<String> arr2=  new ArrayList<String>(Arrays.asList("b","d","f"));

            for(int i = 0; i <= arr1.size(); i++){
                if(arr2.contains(arr1.get(i))){
                     System.out.println("yes");
                }
                     else{
                         System.out.println("No");
                     }}
}}

Answer 1

尝试替换它：

  for(int i = 0; i <= arr1.size(); i++){

使用<代替<=，如下所示：

  for(int i = 0; i < arr1.size(); i++){

因为ArrayList的大小从0开始到size()-1。

Answer 2

使用retain all，快速准确，高效：

 String orig[] = { "a", "b", "b", "c" };
 String act[] = { "x", "b", "b", "y" };
 List origList = new ArrayList(Arrays.asList(orig));
 List actList = Arrays.asList(act);
 origList.retainAll(actList);
 System.out.println(origList);