选择使用对象的ArrayList排序[关闭]

我在排序时遇到了一些问题。它只会按顺序正确显示第一个文件。有人看到我做错了什么吗?我已经想了好几个小时了,就是不知道自己做错了什么。

public void sort() { 

    int i; //loop control
    int last; //last position in the arraylist
    int max; //position where last alphabetical filename is found

    max = 0; //largest position so far is first, since i haven't checked

    //I thought i should start at the end and work my way down
    for(last = fileList.size()-1; last >= 0; last--) {

        for(i = 0; i < fileList.size(); i++) {
            if(fileList.get(max).getFileName().compareTo(fileList.get(i).getFileName()) > 0)
                max = i;
        }

        //swap pixfile in last position with the last alphabetical
        Pixfile tempPix = fileList.get(last);
        fileList.set(last, fileList.get(max));
        fileList.set(max, tempPix);
        //i thought i would repeat until last = 0 and the arraylist is sorted
    }//end for

}