检查ArrayList是否包含一个Array对象 [英] Check if ArrayList contains an Array Object

问题描述

是否可以检查ArrayList是否包含对象数组?例如我有一个arrayList

Is there a way to check if an ArrayList contains an array of objects? For example I have an arrayList

ArrayList<Integer[]> myList = new ArrayList<Integer[]>();
mylist.add(new Integer[]{5,5});
mylist.add(new Integer[]{1,1});

我想检查它是否包含特定的Integer数组.喜欢:

I would like to check if it contains a specific Integer array. Like:

Integer[] myArray = new Integer[]{5,5};

如果我使用myList.containts(myArray);它应该返回true，但是它检查是否包含Integer对象，而不是数组Values.

if I use the myList.containts(myArray); it should return true, but it checks if the Integer object is containted, not the array Values.

有没有办法检查这些值?

Is there a way to check the values?

推荐答案

java.util.Arrays 包含几种与数组相关的实用程序方法，包括 Arrays.deepEquals(Object [] a1，Object [] a2).您可以根据该测试扫描列表以查找与 new Integer [] {5,5} 相等的任何元素:

java.util.Arrays contains several array-related utility methods, including Arrays.deepEquals(Object[] a1, Object[] a2). You can scan the list looking for any element that is equal to new Integer[]{5,5} according to that test:

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

public class Test {
  public static void main(String[] args) {
    ArrayList<Integer[]> myList = new ArrayList<Integer[]>();
    myList.add(new Integer[] { 5, 5 });
    myList.add(new Integer[] { 1, 1 });
    System.out.println(deepContains(myList, new Integer[] { 5, 5 }));
    System.out.println(deepContains(myList, new Integer[] { 5, 3 }));
  }

  public static boolean deepContains(List<Integer[]> list, Integer[] probe) {
    for (Integer[] element : list) {
      if (Arrays.deepEquals(element, probe)) {
        return true;
      }
    }
    return false;
  }
}

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