byte []数组的长度

Question

String str = "123456789";
byte[] bytes = str.getBytes();

I want to make the following loop

for (int j = 0; j < bytes.length(); j++) {
  b = bytes[j];
}

b will store each byte of my array, but I can't seem to get the length of the array correctly.

Error:cannot find symbol
Problem solved:  bytes.length instead of  bytes.length()

Answer 1

使用bytes.length而不使用()

Answer 2

See the JLS - 10.7. Array Members :

The members of an array type are all of the following:

The public final field length , which contains the number of components of the array. length may be positive or zero.

length is a property , not a method. You should write:

bytes.length

Answer 3

它不是bytes.length() ，它的bytes.length

Answer 4

In order to get the length of an array, use length . For example:

int[] arr = {1,2,3};
int length = arr.length;

In order to get the length of a string, use length() . For example:

String str = "123";
int length = str.length();

Answer 5

getBytes() Encodes the String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.

Try to print the bytes you will see the encoded values which may differ in length compare to original string.