Java 如何解析并获取出现在值端的键数？计数应该是7

这里的名称是键，

{

后面的右边是一个值。如何解析和获取值端的“键”计数数

{name={doc_count_error_upper_bound=0.0, sum_other_doc_count=0.0,
buckets=[{key=x, doc_count=165324.0}, {key=y, doc_count=100875.0},
{key=z, doc_count=99981.0}, {key=A, doc_count=76631.0}, {key=B,
doc_count=68793.0}, {key=C, doc_count=50717.0}, {key=D,
doc_count=50034.0}]}

---

此代码适用于您：

SEVERE: Servlet.service() for servlet [spring-web] in context with path [/Reports] threw exception [Request processing failed; nested
exception is java.lang.ClassCastException:
com.google.gson.internal.LinkedTreeMap cannot be cast to
java.lang.String] with root cause
    java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to
java.lang.String

publicstaticvoidmain（字符串[]args）{
字符串s=“{name={doc\u count\u error\u upper\u bound=0.0，sum\u other\u doc\u count=0.0，bucket=[{key=x，doc\u count=165324.0}，{key=y，doc\u count=100875.0}，{key=z，doc\u count=99981.0}，{key=A，doc count 76631.0}，{key=B，doc count 68793.0}，{key=C，doc key=507.0}，{；
int i=0；
整数计数=0；
而（i

---

O/p:7

String value=pair.getValue（）；String arrr[]=value.split（“，”）；System.out.println（value）；int senderValue=0；for（int i=0；i键的次数吗？另外，请编辑问题并在那里添加代码。是的，只想在值侧添加键计数，因此计数应该是7？

SEVERE: Servlet.service() for servlet [spring-web] in context with path [/Reports] threw exception [Request processing failed; nested
exception is java.lang.ClassCastException:
com.google.gson.internal.LinkedTreeMap cannot be cast to
java.lang.String] with root cause
    java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap cannot be cast to
java.lang.String

public static void main(String[] args) {
        String s = "{name={doc_count_error_upper_bound=0.0, sum_other_doc_count=0.0, buckets=[{key=x, doc_count=165324.0}, {key=y, doc_count=100875.0}, {key=z, doc_count=99981.0}, {key=A, doc_count=76631.0}, {key=B, doc_count=68793.0}, {key=C, doc_count=50717.0}, {key=D, doc_count=50034.0}]}";
        int i = 0;
        int count = 0;
        while (i < s.length()) {
            i = s.indexOf("key", i);
            if (i != -1) {
                count++;
                i++;
            }
            else {
                break;
            }
        }
        System.out.println(count);
    }