The 'to' row (0) must not be less than the 'from' row (1)

1、错误描述

Exception in thread "main" java.lang.IllegalArgumentException: The ‘to‘ row (0) must not be less than the ‘from‘ row (1)
	at org.apache.poi.hssf.model.InternalSheet.addMergedRegion(InternalSheet.java:513)
	at org.apache.poi.hssf.usermodel.HSSFSheet.addMergedRegion(HSSFSheet.java:680)
	at com.you.excel.ThreeHead.main(ThreeHead.java:130)

2、错误原因

Region region1 = new Region(0, (short)0, 2, (short)0);
		Region region2 = new Region(0, (short)1, 0, (short)6);
		Region region3 = new Region(0, (short)7, 0, (short)12);
		Region region4 = new Region(0, (short)13, 0, (short)18);
		Region region5 = new Region(1, (short)1, 0, (short)3);
		Region region6 = new Region(0, (short)4, 0, (short)6);
		Region region7 = new Region(0, (short)7, 0, (short)9);
		Region region8 = new Region(0, (short)10, 0, (short)12);
		Region region9 = new Region(0, (short)13, 0, (short)15);
		Region region10 = new Region(0, (short)16, 0, (short)18); 

		sheet.addMergedRegion(region1);
		sheet.addMergedRegion(region2);
		sheet.addMergedRegion(region3);
		sheet.addMergedRegion(region4);
		sheet.addMergedRegion(region5);
		sheet.addMergedRegion(region6);
		sheet.addMergedRegion(region7);
		sheet.addMergedRegion(region8);
		sheet.addMergedRegion(region9); 

Region(int rowFrom, short colFrom, int rowTo, short colTo)

rowFrom要比rowTo小或等于

3、解决办法

Region region1 = new Region(0, (short)0, 2, (short)0);
		Region region2 = new Region(0, (short)1, 0, (short)6);
		Region region3 = new Region(0, (short)7, 0, (short)12);
		Region region4 = new Region(0, (short)13, 0, (short)18);
		Region region5 = new Region(0, (short)1, 0, (short)3);
		Region region6 = new Region(0, (short)4, 0, (short)6);
		Region region7 = new Region(0, (short)7, 0, (short)9);
		Region region8 = new Region(0, (short)10, 0, (short)12);
		Region region9 = new Region(0, (short)13, 0, (short)15);
		Region region10 = new Region(0, (short)16, 0, (short)18); 

		sheet.addMergedRegion(region1);
		sheet.addMergedRegion(region2);
		sheet.addMergedRegion(region3);
		sheet.addMergedRegion(region4);
		sheet.addMergedRegion(region5);
		sheet.addMergedRegion(region6);
		sheet.addMergedRegion(region7);
		sheet.addMergedRegion(region8);
		sheet.addMergedRegion(region9);
		sheet.addMergedRegion(region10); 

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The 'to' row (0) must not be less than the 'from' row (1)