[英]comparing byte arrays in groovy
I'm declaring byte arrays in Groovy: 我在Groovy中声明字节数组:
def array1 = [-1,5,3] as byte []
def array2 = [-5,2,9] as byte []
How can I compare the two arrays to return true/false based on whether each element of the array is same. 如何根据数组的每个元素是否相同,比较两个数组以返回true / false。
I tried this in groovysh
but it keeps erroring out: 我在groovysh
尝试过此方法,但始终groovysh
:
groovy:000> def array1 = [-1,5,3] as byte[]
===> [B@18e501c
groovy:000> def array2 = [-5,2,9] as byte[]
===> [B@5e860ba9
groovy:000> array1.equals array2
ERROR groovy.lang.MissingPropertyException:
No such property: array1 for class: groovysh_evaluate
at groovysh_evaluate.run (groovysh_evaluate:2)
...
There are a couple of issues here. 这里有几个问题。
First, it appears that you are using the groovy shell, via 'groovysh' With groovysh, you have to omit the 'def' when declaring a variable - it's a quirk of the shell. 首先,似乎您正在通过groovysh使用groovy shell。对于groovysh,声明变量时必须省略'def'-这是外壳的怪癖。
You are getting this error because after executing def array1 = [-1,5,3] as byte[]
, array1 is undefined. 之所以会出现此错误,是因为在将def array1 = [-1,5,3] as byte[]
,未定义array1。
Second, the equals() method won't behave the way that you expect in this situation - you will need to use the '==' operator instead. 其次,在这种情况下,equals()方法将无法达到预期的效果-您将需要使用'=='运算符。
Here's what I get: 这是我得到的:
groovy:000> array1 = [-1,5,3] as byte[]
===> [B@1d429498
groovy:000> array2 = [-5,2,9] as byte[]
===> [B@ac1b161
groovy:000> array3 = [-1,5,3] as byte[]
===> [B@5ca3ce3f
groovy:000> array1.equals array2
===> false
groovy:000> array1.equals array3
===> false
groovy:000> array1 == array2
===> false
groovy:000> array1 == array3
===> true
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