java - if else 如何使用 java 从 JSON 文件中删除重复元素？

Question

在我的代码中找到的这个开始来 self 的 JSON 文件。现在，在我的 JSON 文件中，我有很多同名的“start”。例如，在此 JSON 文件中，我在开头有重复项(内容均为“audi”):

{"rel": "AtLocation", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "0209765bf7185615ef242513f61ca0f61efe2a04", "features": ["audi AtLocation -", "audi - curitiba", "- AtLocation curitiba"], "end": "curitiba", "license": "/l/CC/By-SA", "uri": "/a/[AtLocation/,audi/,curitiba/]", "start": "audi", "context": "/ctx/all", "surfaceText": null}

{"rel": "AtLocation", "weight": 0.5, "dataset": "/d/dbpedia/en", "sources": ["/s/dbpedia/3.7"], "id": "5158d1cfce728efb3e42840d166ec06153a3d77d", "features": ["audi AtLocation -", "audi - ingolstadt", "- AtLocation ingolstadt"], "end": "unite_state", "license": "/l/CC/By-SA", "uri": "/a/[AtLocation/,audi/,ingolstadt/]", "start": "audi", "context": "/ctx/all", "surfaceText": null}

这是我的 Java 代码:

String start = (String) jsonObject.get("start");  
StartVertex startV = new StartVertex(start);  
helloGraphDB.addVertex(startV);    

我不希望它添加同一个“audi”的Vertex 2次，我该如何编写逻辑if else out？

谢谢。

Answer 1

`您可以使用arraylist检查值是否已经插入到addVertex

喜欢:

ArrayList addedVertex_Val = new ArrayList();
    String start = (String) jsonObject.get("start");
    boolean shouldInsert = true;

    for (int al_length = 0; al_length < addedVertex_val.size(); al_length++) {
        String val = addedVertex_val.get(al_length).toString();
        if (val.equals(start)) {
            shouldInsert = false;
            break;
        }
    }

    if (shouldInsert) {
        StartVertex startV = new StartVertex(start);
        helloGraphDB.addVertex(startV);
        addedVertex_Val.add(startV);
    }

`