This question already has answers here:
Different behaviour of java bytecode
(6 answers)
Closed 7 years ago.
Why do we have the iconst_* instructions?
Why would I ever want to use these instead of bipush?
I found this StackOverflow question when searching but it does not properly answer my question.
Because a bipush instruction takes two bytes in the bytecode, and an iconst_* instruction takes one byte.
Related
This question already has answers here:
How to find out the number of CPUs using python
(15 answers)
Closed 3 years ago.
In Java, this will return the number of available processors:
Runtime.getRuntime().availableProcessors()
This is handy when deciding how many long running threads to create.
Is there an equivalent function to call in Python?
Here you go, there are definitely duplicate answers out there
import os
os.cpu_count()
With python 2.6 or greater ,
multiprocessing.cpu_count()
This question already has answers here:
Searching for a sequence of Bytes in a Binary File with Java
(5 answers)
Closed 5 years ago.
I come up an idea to read a byte[] array with the same size of the input, and check one by one. But it seems not very efficient. Is there a way to solve it by using rolling hash?
If you are using java 8 or above please check the
java.util.Optional<T>
The documentation is here
Optional
If I got what you mean correctly
This question already has answers here:
What is the difference between a += b and a =+ b , also a++ and ++a?
(9 answers)
Closed 7 years ago.
Is += the same as =+?
I can't find any reason for why the plus sign is reversible.
For what reasons would I need to use one of the other? Where can i find docs on this i tried searching but didnt see the use of both.
It's not the same.
x+=5 is equivalent to x=x+5.
x=+5 (or x=(+5)) is equivalent to x=5.
This question already has answers here:
Raising a number to a power in Java
(10 answers)
Closed 8 years ago.
Could anyone explain to me why
System.out.println(100*(1-10^(-10/10)));
results in the number "800" being printed out? The correct answer is 90 when you use a calculator. How would I go about doing this calculation in Java?
Thanks!
The ^ operator does not do what you think it does. It is bitwise-xor
You need to look into the Math.pow() method.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
What is the Java equivalent of Objective-C's NSDictionary?
I've seen other answers but they seem to squabble over each other in terms of response.
I need to translate some Objective-C and I am using NSDictionary a lot. What should I try to use in Java for this ?
The best Java equivalent is a Map implementation specifically HashMap.