树状图是如何工作的？

Question

所以我试图从 excel 文件中读取数据，并且我使用 Treemap 来读取文件。但问题是 treemap 将我的数据随机放入其列表中。虽然，我用的时候设置了索引

//This writes the data from an old file
//writer is my treemap
//sReadData is a List with the old data

for (int i = 0; i < (sReadData.size()+1)/5; i++) {
                
     writer.put(String.valueOf(i),new Object[] { sReadData.get(i*5),sReadData.get(i*5+1),sReadData.get(i*5+2),sReadData.get(i*5+3),sReadData.get(i*5+4)});
}
            

writer.put(String.valueOf(iCounter +1), new Object[] { "Name", "Date","Time", "Type","Owner"});

//This writes the new data
for (int i = 0; i < sName.length; i++) {
                              //iCounter is just the number of rows from the old file|These are just some Array with some data
     writer.put(String.valueOf(iCounter+2+i), new Object[] { sName[i], sDate[i],sTime[i], sTypes[i],sOwners[i]});
}

我的错误是我错误地初始化了树状图。它应该是这样的： Map tMap = new TreeMap();

Answer 1

顺序不会是随机的。但它可能不是你所期望的。字符串按词法排序，因此 "1" < "10" < "100" < ... < "11" ... < "2".

如果您希望 TreeMap 条目按数字顺序返回，请使用 Integer 作为键类型。

When I try to use an int instead of a String, I get this error:
 The method put(String, Object[]) in the type Map<String,Object[]>
 is not applicable for the arguments (int, Object[])

您还需要将地图的声明更改为TreeMap<Integer, Object[]>。

树状图是如何工作的？

How does Treemap works?

java

excel

treemap