diff --git a/java/examples/src/main/java/org/apache/tsfile/v4/ITsFileReaderAndITsFileWriter.java b/java/examples/src/main/java/org/apache/tsfile/v4/ITsFileReaderAndITsFileWriter.java
index 22cd280bd..5f9e330e6 100644
--- a/java/examples/src/main/java/org/apache/tsfile/v4/ITsFileReaderAndITsFileWriter.java
+++ b/java/examples/src/main/java/org/apache/tsfile/v4/ITsFileReaderAndITsFileWriter.java
@@ -126,13 +126,12 @@ public static void main(String[] args) throws IOException {
       // first column is Time
       ResultSetMetadata metadata = resultSet.getMetadata();
       System.out.println(metadata);
+      StringJoiner sj = new StringJoiner(" ");
+      for (int column = 1; column <= 5; column++) {
+        sj.add(metadata.getColumnName(column) + "(" + metadata.getColumnType(column) + ") ");
+      }
+      System.out.println(sj.toString());
       while (resultSet.next()) {
-        StringJoiner sj = new StringJoiner(" ");
-        for (int column = 1; column <= 5; column++) {
-          sj.add(metadata.getColumnName(column) + "(" + metadata.getColumnType(column) + ") ");
-        }
-        System.out.println(sj.toString());
-
         // columnIndex starts from 1
         // Time id1 id2 s1 s2
         Long timeField = resultSet.getLong("Time");