Java Arrays.sort（）错误“ AWT-EventQueue-0”

Question

我正在尝试对2维数组进行排序，以进行遗传算法总体排名。我使用了Arrays.sort（）方法。它适用于10个人口，但是当我尝试添加人口数量时。它停止并发送错误消息

this is the error message that i got:
"Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: "n', Size: "n"
    at java.util.ArrayList.rangeCheck(ArrayList.java:653)
    at java.util.ArrayList.get(ArrayList.java:429)"

does it caused by the default initial capacity at Arraylist.class?

private静态最终int DEFAULT_CAPACITY = 10;

please help to find out this problem, thank you