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Swapan Pramanick
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‎apache-poi/README.md‎

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- [Read Excel Cell Value Rather Than Formula With Apache POI](https://www.baeldung.com/apache-poi-read-cell-value-formula)
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- [Setting Formulas in Excel with Apache POI](https://www.baeldung.com/java-apache-poi-set-formulas)
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- [Insert a Row in Excel Using Apache POI](https://www.baeldung.com/apache-poi-insert-excel-row)
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- [Multiline Text in Excel Cell Using Apache POI](https://www.baeldung.com/apache-poi-write-multiline-text)

‎apache-poi/src/main/java/com/baeldung/poi/excel/cellstyle/CellStyleHandler.java‎

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package com.baeldung.poi.excel.cellstyle;
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import org.apache.poi.ss.usermodel.Cell;
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import org.apache.poi.ss.usermodel.CellStyle;
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import org.apache.poi.ss.usermodel.FillPatternType;
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import org.apache.poi.ss.usermodel.IndexedColors;
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public class CellStyleHandler {
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public void changeCellBackgroundColor(Cell cell) {
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CellStyle cellStyle = cell.getCellStyle();
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if(cellStyle == null) {
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cellStyle = cell.getSheet().getWorkbook().createCellStyle();
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}
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cellStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex());
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cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
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cell.setCellStyle(cellStyle);
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}
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public void changeCellBackgroundColorWithPattern(Cell cell) {
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CellStyle cellStyle = cell.getCellStyle();
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if(cellStyle == null) {
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cellStyle = cell.getSheet().getWorkbook().createCellStyle();
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}
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cellStyle.setFillBackgroundColor(IndexedColors.BLACK.index);
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cellStyle.setFillPattern(FillPatternType.BIG_SPOTS);
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cellStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex());
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cell.setCellStyle(cellStyle);
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}
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}

‎apache-poi/src/main/resources/cellstyle/CellStyleHandlerTest.xlsx‎

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‎apache-poi/src/test/java/com/baeldung/poi/excel/cellstyle/CellStyleHandlerUnitTest.java‎

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package com.baeldung.poi.excel.cellstyle;
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import org.apache.poi.ss.usermodel.*;
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import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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import org.junit.Before;
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import org.junit.Test;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.URISyntaxException;
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import java.nio.file.Paths;
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import static org.junit.Assert.assertEquals;
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public class CellStyleHandlerUnitTest {
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private static final String FILE_NAME = "cellstyle/CellStyleHandlerTest.xlsx";
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private static final int SHEET_INDEX = 0;
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private static final int ROW_INDEX = 0;
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private static final int CELL_INDEX = 0;
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private String fileLocation;
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private CellStyleHandler cellStyleHandler;
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@Before
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public void setup() throws URISyntaxException {
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fileLocation = Paths.get(ClassLoader.getSystemResource(FILE_NAME).toURI()).toString();
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cellStyleHandler = new CellStyleHandler();
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}
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@Test
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public void givenWorkbookCell_whenChangeCellBackgroundColor() throws IOException {
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Workbook workbook = new XSSFWorkbook(fileLocation);
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Sheet sheet = workbook.getSheetAt(SHEET_INDEX);
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Row row = sheet.getRow(ROW_INDEX);
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Cell cell = row.getCell(CELL_INDEX);
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cellStyleHandler.changeCellBackgroundColor(cell);
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assertEquals(IndexedColors.LIGHT_BLUE.index, cell.getCellStyle().getFillForegroundColor());
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workbook.close();
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}
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@Test
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public void givenWorkbookCell_whenChangeCellBackgroundColorWithPattern() throws IOException {
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Workbook workbook = new XSSFWorkbook(fileLocation);
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Sheet sheet = workbook.getSheetAt(SHEET_INDEX);
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Row row = sheet.getRow(ROW_INDEX);
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Cell cell = row.getCell(CELL_INDEX + 1);
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cellStyleHandler.changeCellBackgroundColorWithPattern(cell);
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assertEquals(IndexedColors.LIGHT_BLUE.index, cell.getCellStyle().getFillForegroundColor());
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workbook.close();
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}
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}

‎core-java-modules/core-java-11-2/pom.xml‎

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<artifactId>mockserver-junit-jupiter</artifactId>
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<version>${mockserver.version}</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>

‎core-java-modules/core-java-14/pom.xml‎

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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>

‎core-java-modules/core-java-15/pom.xml‎

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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>

‎core-java-modules/core-java-16/pom.xml‎

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<artifactId>commons-lang3</artifactId>
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<version>3.12.0</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>

‎core-java-modules/core-java-17/pom.xml‎

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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>${junit-jupiter.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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‎core-java-modules/core-java-concurrency-2/pom.xml‎

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</parent>
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<dependency>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.googlecode.thread-weaver</groupId>
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<artifactId>threadweaver</artifactId>
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<artifactId>tempus-fugit</artifactId>
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<version>${tempus-fugit.version}</version>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>com.googlecode.multithreadedtc</groupId>

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