問題描述
我有一個字節數組，里面有一個~已知的二進制序列.我需要確認二進制序列是它應該是什么.除了 == 之外，我還嘗試了 .equals，但都沒有成功.
I have a byte array with a ~known binary sequence in it. I need to confirm that the binary sequence is what it's supposed to be. I have tried .equals in addition to ==, but neither worked.
byte[] array = new BigInteger("1111000011110001", 2).toByteArray();
if (new BigInteger("1111000011110001", 2).toByteArray() == array){
System.out.println("the same");
} else {
System.out.println("different'");
}
推薦答案
在你的例子中，你有:
if (new BigInteger("1111000011110001", 2).toByteArray() == array)
在處理對象時，java中的==會比較引用值.您正在檢查 toByteArray() 返回的對數組的引用是否與 array 中保存的引用相同，這當然不可能是真的.此外，數組類不會覆蓋 .equals() 因此其行為是 Object.equals() 的行為，它也只比較參考值.
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same as the reference held in array, which of course can never be true. In addition, array classes don't override .equals() so the behavior is that of Object.equals() which also only compares the reference values.
為了比較兩個數組的內容，數組類
byte[] array = new BigInteger("1111000011110001", 2).toByteArray();
byte[] secondArray = new BigInteger("1111000011110001", 2).toByteArray();
if (Arrays.equals(array, secondArray))
{
System.out.println("Yup, they're the same!");
}
這篇關于比較兩個字節數組?(爪哇)的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！