How to convert a json String to json array using java and Gson

The quick way would be to use Map and unchecked casts to extract the jsonKeywords element. Assuming you read the JSON into inputJson variable:

Gson gson = new Gson();
Map<String, ?> map = gson.fromJson(inputJson, Map.class);
System.out.println(gson.toJson(map.get("jsonKeywords")));

will output:

[{"xmlNodeKWId":0.0,"xmlNodeId":35.0,"nodeKeyword":"dfdfdf","keywordPosition":"Top","keywordPrefix":"","keywordSuffix":"abcd","valueInLine":0.0,"keywordMatchPattern":"","templateId":3.0}]

Response class:

 public class Response{

    @SerializedName("jsonKeywords")
    private List<JsonKeywordsItem> jsonKeywords;

    public void setJsonKeywords(List<JsonKeywordsItem> jsonKeywords){
        this.jsonKeywords = jsonKeywords;
    }

    public List<JsonKeywordsItem> getJsonKeywords(){
        return jsonKeywords;
    }

    @Override
    public String toString(){
        return 
            "Response{" + 
            "jsonKeywords = '" + jsonKeywords + '\'' + 
            "}";
        }
}

JsonKeywordsItem class:

public class JsonKeywordsItem {

@SerializedName("keywordSuffix")
private String keywordSuffix;

@SerializedName("valueInLine")
private int valueInLine;

@SerializedName("keywordMatchPattern")
private String keywordMatchPattern;

@SerializedName("nodeKeyword")
private String nodeKeyword;

@SerializedName("keywordPrefix")
private String keywordPrefix;

@SerializedName("keywordPosition")
private String keywordPosition;

@SerializedName("templateId")
private int templateId;

@SerializedName("xmlNodeKWId")
private int xmlNodeKWId;

@SerializedName("xmlNodeId")
private int xmlNodeId;

public void setKeywordSuffix(String keywordSuffix) {
    this.keywordSuffix = keywordSuffix;
}

public String getKeywordSuffix() {
    return keywordSuffix;
}

public void setValueInLine(int valueInLine) {
    this.valueInLine = valueInLine;
}

public int getValueInLine() {
    return valueInLine;
}

public void setKeywordMatchPattern(String keywordMatchPattern) {
    this.keywordMatchPattern = keywordMatchPattern;
}

public String getKeywordMatchPattern() {
    return keywordMatchPattern;
}

public void setNodeKeyword(String nodeKeyword) {
    this.nodeKeyword = nodeKeyword;
}

public String getNodeKeyword() {
    return nodeKeyword;
}

public void setKeywordPrefix(String keywordPrefix) {
    this.keywordPrefix = keywordPrefix;
}

public String getKeywordPrefix() {
    return keywordPrefix;
}

public void setKeywordPosition(String keywordPosition) {
    this.keywordPosition = keywordPosition;
}

public String getKeywordPosition() {
    return keywordPosition;
}

public void setTemplateId(int templateId) {
    this.templateId = templateId;
}

public int getTemplateId() {
    return templateId;
}

public void setXmlNodeKWId(int xmlNodeKWId) {
    this.xmlNodeKWId = xmlNodeKWId;
}

public int getXmlNodeKWId() {
    return xmlNodeKWId;
}

public void setXmlNodeId(int xmlNodeId) {
    this.xmlNodeId = xmlNodeId;
}

public int getXmlNodeId() {
    return xmlNodeId;
}

@Override
public String toString() {
    return
            "JsonKeywordsItem{" +
                    "keywordSuffix = '" + keywordSuffix + '\'' +
                    ",valueInLine = '" + valueInLine + '\'' +
                    ",keywordMatchPattern = '" + keywordMatchPattern + '\'' +
                    ",nodeKeyword = '" + nodeKeyword + '\'' +
                    ",keywordPrefix = '" + keywordPrefix + '\'' +
                    ",keywordPosition = '" + keywordPosition + '\'' +
                    ",templateId = '" + templateId + '\'' +
                    ",xmlNodeKWId = '" + xmlNodeKWId + '\'' +
                    ",xmlNodeId = '" + xmlNodeId + '\'' +
                    "}";
}
}




Gson gson = new Gson();
      Response response = gson.fromJson("Your response string", Response.class);
            List<JsonKeywordsItem> mList = response.getJsonKeywords();

You have to use JSONARRAY to get data array from JSON:

JSONObject jsonObject= new JSONObject(jsonResponse);
JSONArray jsonArray = jsonObject.getJSONArray("jsonKeywords");

Also, Refer This Link