Java集合、数组的默认toString()输出结果

1.Map

{3=value3, 2=value2, 1=value1, 5=value5, 4=value4}

2.List

[1, 2, 3]

3.Set

[3, 2, 1]

4.数组String[]

[Ljava.lang.String;@4e8a88a9