BAEL-6521 - Lock Header Rows with Apache POI (#14535)

apache-poi-2/src/main/java/com/baeldung/poi/excel/locksheet/LockSheet.java

@@ -0,0 +1,19 @@
+package com.baeldung.poi.excel.locksheet;
+
+import org.apache.poi.ss.usermodel.*;
+
+public class LockSheet {
+
+    public void lockFirstRow(Sheet sheet) {
+        sheet.createFreezePane(0, 1);
+    }
+
+    public void lockTwoRows(Sheet sheet) {
+        sheet.createFreezePane(0, 2);
+    }
+
+    public void lockFirstColumn(Sheet sheet) {
+        sheet.createFreezePane(1, 0);
+    }
+
+}

apache-poi-2/src/test/java/com/baeldung/poi/excel/locksheet/LockSheetUnitTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.poi.excel.locksheet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.*;
+
+class LockSheetUnitTest {
+
+    private LockSheet lockSheet;
+    private Workbook workbook;
+    private Sheet sheet;
+
+    @BeforeEach
+    void setup() {
+        workbook = new XSSFWorkbook();
+        sheet = workbook.createSheet();
+        Row row = sheet.createRow(0);
+        row.createCell(0).setCellValue("row 1 col 1");
+        row.createCell(1).setCellValue("row 1 col 2");
+        row = sheet.createRow(1);
+        row.createCell(0).setCellValue("row 2 col 1");
+        row.createCell(1).setCellValue("row 2 col 2");
+        lockSheet = new LockSheet();
+    }
+
+    @AfterEach
+    void cleanup() throws IOException {
+        workbook.close();
+    }
+
+    @Test
+    void whenLockFirstRow_thenFirstRowIsLocked() {
+        lockSheet.lockFirstRow(sheet);
+        assertEquals(sheet.getPaneInformation().getHorizontalSplitPosition(), 1);
+    }
+
+    @Test
+    void whenLockTwoRows_thenTwoRowsAreLocked() {
+        lockSheet.lockTwoRows(sheet);
+        assertEquals(sheet.getPaneInformation().getHorizontalSplitPosition(), 2);
+    }
+
+    @Test
+    void whenLockFirstColumn_thenFirstColumnIsLocked() {
+        lockSheet.lockFirstColumn(sheet);
+        assertEquals(sheet.getPaneInformation().getVerticalSplitPosition(), 1);
+    }
+
+}