java比较2按对象id列出

Question

正如标题所说，我有一个问题。我有两个数组。一个长度是五个。另一个长七个。

即使两个数组中的对象不同，如果数组中的所有对象具有相同的id，则将判断为具有相同的对象。

关于javascript有很多答案，但似乎关于java的答案并不多。任何遇到相同问题的人都可以分享解决方案。如果您对我的问题有任何类似的问题，请分享。非常感谢。

以下是我的尝试和样本数据。

"maxCastings"

[
        {
          "characterNo": "100121",
          "characterName": "막심 드 윈터",
          "manNo": "",
          "manName": "",
         
        },
        {
          "characterNo": "100122",
          "characterName": "댄버스 부인",
          "manNo": "3727",
          "manName": "옥주현",
          
        },
        {
          "characterNo": "100123",
          "characterName": "나",
          "manNo": "29655",
          "manName": "이지혜",
        
        },
        {
          "characterNo": "100124",
          "characterName": "잭 파벨",
          "manNo": "4202",
          "manName": "이창용",
         
        },
        {
          "characterNo": "100125",
          "characterName": "반 호퍼 부인",
          "manNo": "40282",
          "manName": "한유란",
         
        },
        {
          "characterNo": "100126",
          "characterName": "베아트리체",
          "manNo": "3543",
          "manName": "류수화",
         
        },
        {
          "characterNo": "100128",
          "characterName": "프랭크 크롤리",
          "manNo": "42618",
          "manName": "임정모",
         
        },
        {
          "characterNo": "100130",
          "characterName": "줄리앙 대령",
          "manNo": "31476",
          "manName": "김현웅",
         
        }
      ]

列表的5个对象是这个。

"castings"

[
  {
    "characterNo": "100121",
    "characterName": "막심 드 윈터",
    "manName": "에녹"
  },
  {
    "characterNo": "100122",
    "characterName": "댄버스 부인",
    "manName": "옥주현"
  },
  {
    "characterNo": "100123",
    "characterName": "나",
    "manName": "임혜영"
 },
  {
    "characterNo": "100124",
    "characterName": "잭 파벨",
    "manName": "최민철"
  },
  {
    "characterNo": "100125",
    "characterName": "반 호퍼 부인",
    "manName": "김지선"
  },
  {
    "characterNo": "100126",
    "characterName": "베아트리체",
    "manName": "김경호"
  }
]

如果manName不同但字符No相同，我想检查两个数组是否具有相同的元素。

我想要的是7个中的2个不是相同的元素。

这是我的代码

List<Casting> unMatchList = maxCastings.stream().filter(o1 -> castings.stream().noneMatch(o2 -> o2.getCharacterNo().equals(o1.getCharacterNo()))).collect(
                                        Collectors.toList());

这又回来了

错误:(737，95) java:从lambda表达式引用的局部变量必须是final或有效的final

Answer 1

这是一个工作代码示例，我用它来重新创建您的问题，它可以工作。。。

    class Data {
        Integer characterNo;
        String characterName;
        String manName;

        public Data(Integer characterNo, String characterName, String manName) {
            this.characterNo = characterNo;
            this.characterName = characterName;
            this.manName = manName;
        }

        public Integer getCharacterNo() {
            return characterNo;
        }

        public void setCharacterNo(Integer characterNo) {
            this.characterNo = characterNo;
        }

        public String getCharacterName() {
            return characterName;
        }

        public void setCharacterName(String characterName) {
            this.characterName = characterName;
        }

        public String getManName() {
            return manName;
        }

        public void setManName(String manName) {
            this.manName = manName;
        }

        @Override
        public String toString() {
            return "Data{" +
                    "characterNo=" + characterNo +
                    ", characterName='" + characterName + '\'' +
                    ", manName='" + manName + '\'' +
                    '}';
        }
    }

    @Test
    void getNonMatchingList() {
        var a1 = List.of(
                new Data(1,"x","a"),
                new Data(2,"x","b")
        );

        var a2 = List.of(
                new Data(1,"x","a")
        );

        var unMatchList = a1.stream().filter(o1 -> a2.stream().noneMatch(o2 -> o2.getCharacterNo().equals(o1.getCharacterNo()))).collect(
                Collectors.toList());

        unMatchList.forEach( it -> System.out.println(it));
    }

因此，您的代码似乎工作正常……唯一的问题是，5Array变量可能不是final或有效final。你可以试着宣布它是最终的，它可能会起作用。如果没有，请发布下一个错误，我们可以进行调试。