我想解析Java中使用GSON和for循环的Json arraylist(children)。 但我收到以下错误:JSONArray array = new JSONArray(string_of_json_array);
for each not applicable to expression type
required:array or java.lang.iterable
found:String
这里是主要的Java类,显示此错误
try {
br = new BufferedReader(new FileReader("user.json"));
Tree result = gson.fromJson(br, Tree.class);
if (result !=null){
for (User t : result.getCategory()){ //ERROR IS HERE (squiggly red line)
System.out.println(t.getId() + "-" + t.getName() + "-" + t.getCategory() + "-" + t.getPercentage()); //ERROR IS ALSO HERE FOR EACH VARIABLES
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (br != null){
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
这是树类:
private String category;
@SerializedName("children")
@Expose
private List<Child> children = new ArrayList<Child>();
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public List<Child> getChildren() {
return children;
}
public void setChildren(List<Child> children) {
this.children = children;
}
用户等级:
private String id;
@SerializedName("processed_lang")
@Expose
private String processedLang;
@SerializedName("source")
@Expose
private String source;
@SerializedName("tree")
@Expose
private Tree tree;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getProcessedLang() {
return processedLang;
}
public void setProcessedLang(String processedLang) {
this.processedLang = processedLang;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public Tree getTree() {
return tree;
}
public void setTree(Tree tree) {
this.tree = tree;
}
String getName() {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
有人可以让我知道我错了什么地方,如果你们想看到JSON代码,让我知道我也将它放置它,我没有放置它的原因是因为它很长。所以我怎么能得到数组列出孩子要表演?谢谢你的时间。
'getCategory'返回一个字符串,但你想遍历它在你的'for'循环。你想在这里完成什么? – Zircon
对不起,我忘了提及..我试图展示Arraylist儿童。 –