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I need to count the frequency of an element in arrays.
I used the method
Collections.frequency(Arrays.asList(arr),element);
but I get zero all the times
any ideas ?!
If you are ArrayList consists of elements of custom type
example person bean, or employee object.
Make sure you have overridden equals() method and hash() methods
if you have not overridden these methods that Collection method wont work.
You need to give details about "arr" & element. However, I did came across this some time back when I tried to use an array of primitives such as int[], converting them to a List using Arrays.asList()
There is nothing like List of "int". An Integer would work however, Integer arr[] = {1,1,1,1,3,3,4,5,5,5,6};
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So i need the following values: Values
I want to get them and save them in a variable for example. Do you have any suggestions for me ?
I want to get them to save the last position of an element. :)
if you have access to your element you can use a reference to it with a ViewChild for example https://angular.io/api/core/ViewChild and then you can use
myElementRef.style.transform
This will only give you a string containing the value of the property transform. If you want to access the values you would have to parse the string.
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guys.....Please help!!!
This is the picture of a textbook page that I'm reading
So I'm reading this textbook which is totally horrible, they just give codes out without any explanation.....And this is my first class in Java, I've never coded in any language before......So like a textbook without explanation just totally....you know....give me a super hard time....
Back to topic, in the picture, there are 2 sets of codes, A and B.....I understand B......But I do not get why in A, it used value.length instead of inputs.length? Isn't the array name in this code is inputs??? Is there any specific reason has to use value.length instead of array name.length???
the book clearly has an error, don't worry, should be inputs instead values, I say it with confidence because no variable values was ever initiated
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For example, I have my main method as well as the method returnOdds(original), that returns the integer array "odd"
How would I print the elements of this array in the main method? With a for loop?
A for loop would work. If you don't care about the format, though, a simpler solution might be to use Arrays.toString, which will convert in the form "[elem1, elem2, ..., elemn]".
"With a for loop?"
answer : "yes"
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I have seen some posts regarding comparing two lists in Java, but none of them relate to ordered lists - I care about values at certain indices being equal.
Instead of writing brute-force code to iterate through both lists, do JUnit or Hamcrest have any util methods to compare ordered "expected" list with ordered "actual" list?
In my case they are both lists of String, but how would this be achieved if they were lists of customObj ?
I want to see all differences, not just stop after the first difference.
AssertJ library or Hamcrest amtchers will help you with the meaningful comparison.
junit's assertEquals works on lists, if the members of the list have equals implemented. String has a working equals method, so assertEquals will work for you
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I encounter a problem that with Java, I have a map,such as map<K,V>, K and V can be arbitrary type, e.g int, Long, String, Time, etc.
After the map is serialized, can I get the length of K or the V? Can I write a common method to implement this idea? Something like:
public long getLength(object obj) {
//how to get the length of this obj, obj can be any type
}
How could do that?
Nope.
But you can approximate though, here's a nice article about a sizeof function.
The reason is that you can change the default binary serialization (which is kinda verbose). There are comparisons for these tools, the last time I was in this topic Kyro was the most optimal (10x smaller than the default Java binary serialization, because it does not neither export redundant nor anything verification-related data).
Here's a comparison about the tools.
There's no way to get the length of an object after serialization except by serializing it.