Example:

Workbook book = new Workbook();
Worksheet sheet = book.getWorksheets().get(0);
Cells cells = sheet.getCells();
cells.get(0, 0).setValue("fruit");
cells.get(1, 0).setValue("grape");
cells.get(2, 0).setValue("blueberry");
cells.get(3, 0).setValue("kiwi");
cells.get(4, 0).setValue("cherry");
cells.get(5, 0).setValue("grape");
cells.get(6, 0).setValue("blueberry");
cells.get(7, 0).setValue("kiwi");
cells.get(8, 0).setValue("cherry");
        
cells.get(0, 1).setValue("year");
cells.get(1, 1).setValue(2020);
cells.get(2, 1).setValue(2020);
cells.get(3, 1).setValue(2020);
cells.get(4, 1).setValue(2020);
cells.get(5, 1).setValue(2021);
cells.get(6, 1).setValue(2021);
cells.get(7, 1).setValue(2021);
cells.get(8, 1).setValue(2021);

cells.get(0, 2).setValue("amount");
cells.get(1, 2).setValue(50);
cells.get(2, 2).setValue(60);
cells.get(3, 2).setValue(70);
cells.get(4, 2).setValue(80);
cells.get(5, 2).setValue(90);
cells.get(6, 2).setValue(100);
cells.get(7, 2).setValue(110);
cells.get(8, 2).setValue(120);

PivotTableCollection pivots = sheet.getPivotTables();

int pivotIndex = pivots.add("=Sheet1!A1:C9", "A12", "TestPivotTable");
PivotTable pivot = pivots.get(pivotIndex);
pivot.addFieldToArea(PivotFieldType.ROW, "fruit");
pivot.addFieldToArea(PivotFieldType.COLUMN, "year");
pivot.addFieldToArea(PivotFieldType.DATA, "amount");

pivot.setPivotTableStyleType(PivotTableStyleType.PIVOT_TABLE_STYLE_MEDIUM_10);

//Add PivotFormatCondition
int formatIndex = pivot.getPivotFormatConditions().add();
PivotFormatCondition pfc = pivot.getPivotFormatConditions().get(formatIndex);
FormatConditionCollection fcc = pfc.getFormatConditions();
fcc.addArea(pivot.getDataBodyRange());
int idx = fcc.addCondition(FormatConditionType.CELL_VALUE);
FormatCondition fc = fcc.get(idx);
fc.setFormula1("100");
fc.setOperator(OperatorType.GREATER_OR_EQUAL);
fc.getStyle().setBackgroundColor(Color.getRed());

pivot.refreshData();
pivot.calculateData();

//do your business

book.save("out.xlsx");