Questions tagged [java]

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34 views

Algorithm to select sets of objects while maximizing number of objects covered

If we have different objects, [A1, A2, A3, B1, B2, B3, B4, B5] Some calculations will be performed to find compatible objects. For example, lets assume following ...
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0answers
447 views

I'm looking for best algorithms to compare two Circular Linked List?

I'm looking for best algorithms to compare two Circular Linked List? For example : List 1 = 1-3-5 List 2 = 3-5-1 I want to compare "same" or "not same" but need fast algorithm.
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2answers
173 views

Formal model of execution for Java (or general imperative language)

I'm trying to prove some statements about execution in Java programs under some heavy restrictions (basically I have a conjecture that if two methods satisfy a set of constraints for a given input ...
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0answers
159 views

Novel escape analysis algorithm for Java

Today I read a very interesting article about escape analysis in Java called Escape Analysis for Object Oriented Languages: Application to Java I think I have some grasp on how escape analysis works ...
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2answers
109 views

How do compilers implement symbolic (rather than textual) insertion?

From a programming language designer's point of view, how is "symbolic" insertion implemented as opposed to "textual" insertion using pre-processor macros? I understand the basics of how "textual" ...
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4answers
136 views

what is the complexity of this program? [duplicate]

// assume 'n' is given. What is the time complexity of this code ? ...
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0answers
210 views

Is the Java 8 Grammar still a LALR(1) grammar?

As I found out here: http://www.eclipse.org/jdt/core/howto/generate%20parser/generateParser.html , the Java Version of 2005 (might be Java 6, I'm not sure) is a LALR(1) grammar. However, I couldn't ...
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1answer
722 views

What fragment of Martin-Löf dependent type theory can be expressed using generic types in Java?

I have recently come to realize that a number of problems I had a few years ago trying to implement various mathematical theories in Java came down to the fact that the typing system in Java is not ...
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1answer
2k views

How does recursion work in void method java [closed]

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0answers
17 views

Without sound synthesis, what is a good way of making a program that plays guitar notes from an array of stored sounds?

Without sound synthesis, what is a good way of making a program that plays guitar notes from an array of stored sounds? What I have in mind is to make note as a function of vibration speed such as N (...
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1answer
236 views

What is the O time complexity for this algorithm?

is the Big-O for this O(1) or some asymptotic like 1/n? Saying that because if it defaults, the time limits at about 1000000 ns, but if it returns while in the loop, it is about a fraction of that. ...
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1answer
216 views

How to calculate the average of x numbers? [closed]

I just started a college course and I'm being asked for a flowchart where I explain how to calculate the average of x quantity of numbers. For this assignment I'm asked to follow the problem solving ...
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2answers
573 views

Version of knap sack problem

The are cuisenaire rods with N differnt lengthes $x_1,x_2,...,x_n$ (each length is a natural number), the number of the Cuisenaire rods is unlimited. Given a natural number B. you should tell if you ...
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1answer
80 views

Can local variables be instance variables? [closed]

I know that variables can be categorized in two ways:- The first way is to classify them into global and local variables based on their scope. When the variable is accessible by all the functions of ...
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2answers
5k views

Find out duplicate number between 1 to N numbers

I first saw this question on this website where I was trying on Java puzzles. Here is the Question:- ...
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1answer
1k views

Which is the best data structure for searching under these conditions

I have a system with some factors, say A, B, C, and D. There can be different values of all these factors. Let us consider few values to have a better understanding. Let's say A has 4 different ...
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2answers
421 views

Binary Search Tree Traversals

I have a clue as to how this code/traversals work but I'm still confused. For example, in the first traversal (Preorder), it prints 31, 12, 25 but then it backtracks all the way to 68? How does it ...
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1answer
42 views

Is there a general pattern/structure/format to most (if not all) computer functions?

First time posting. I know this is a very generalized question, sorry for that, I don't know how to more appropriately word this. I've noticed a tread, a pattern in methods, it seems in almost all ...
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1answer
54 views

Inheritance problem (JAVA) [closed]

Here I have created 2 classes , $A$ is the super class of $B$ , i.e , $B$ inherits the features of class $A$. Now I don't know exactly what statement (1) does but I am speculating as follows ,kindly ...
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0answers
309 views

Normal Distribution pattern in Java Array of doubles

Given ordered array of float numbers, Check if array represents Normal Distribution. I wrote algo to find triangular distribution as follows: ...
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0answers
224 views

Are type constructors always injectives even in presence of quantified type variables (subtyping)?

Are type constructors, in a language that feature subtyping and quantification of type variables, like scala or Java, always injective? That is, is an equivalent of haskell ...
2
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1answer
4k views

improving java 8's implement to hash map using avl tree

Java 8 got a new implement to hashmap (using a tree). I have understand that in the worst case, it may be O(n) for lookup. Will changing this implement to an avl tree change this O(n) case to ...
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1answer
68 views

Why does this statement evaluate to 176? [closed]

int y = 10; int z; z = (++y * (y++ + 5)); // Evaluates to 176 According to me this should evaluate to 180. Please provide an explanation as well which relates to ...
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0answers
94 views

Byte Code/IL Code execution [closed]

I understand that Byte/ IL Codes are interpreted/executed by their corresponding run times. Do those run time converts the Byte/IL codes directly to machine code which processor can execute or the ...
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1answer
1k views

How to write an EBNF grammar for Java float literals?

I've got this question on my study guide: "Write an EBNF grammar description for Java float literals and one for Java double literals." I've browsed the Oracle site and found the grammar for java ...
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1answer
40 views

Methods in Java with/without return? Simple but new to coding [closed]

I want to make this program below but I'm not sure how i would start them. Would i use methods with or without return? I have this due tomorrow and cannot figure it out. I've wrote the code multiple ...
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0answers
28 views

Implementing TCP request and answer [closed]

I'm creating an application where client connects to server, retrieves some data and after that connection is closed. He spends some time changing that data and then connects again to the server ...
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1answer
281 views

What do you mean by minimum height of a Binary Search Tree? [duplicate]

I came across the term "minimum height of a Binary Search Tree" (in Java) in class, but I don't fully understand. Could someone please elaborate on: (a) What it is ? (b) How to determine/...
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1answer
71 views

Is it possible to make excluded search with for loop in Java? [closed]

I am trying to calculate all pure strategy Nash equilibrium in a mxn game. It requires to check all pure strategy pairs (m.n pairs). Suppose player 1 has m strategies. Algorithm should start with the ...
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2answers
156 views

Analysing Algorithms Big Oh/Complexity theory [duplicate]

I'm revising for my finals and from looking at previous exam papers I have a found a popular question that has came up almost every year, worth a lot of marks. Each year the question is written very ...
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2answers
1k views

Break and Continue in Structured Programming?

One of the ways to ensure following the structured programming paradigm is by having all control flows having only one entry and one exit point. Does skipping iterations by using break and continue in ...
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2answers
324 views

How to learn computer science the right way [closed]

I looked through the sites and this seems to be the best place to ask this question. I am sure it has been asked 10000 times but I am looking for a tailored answer to me and my situation. I currently ...
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1answer
106 views

Isn't software needed from programs to run? [closed]

I am a student who has entered a game programming competition called FBLA at school, and I sent them an email because I had a few questions about how the competition is ran. The main question I had, ...
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1answer
95 views

Linked list implementation problem [closed]

Note its not a homework question, just practice Hi i have always seen linked list implementation in java using the following piece of code ...
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1answer
366 views

Code to get java code complexity [duplicate]

I have Java function as input and want to get it's order for example O( n ) I search in the internet very hard but didn't find any thing can help me, is there any algorithms or package may help me.
2
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1answer
468 views

Java, strong typing, covariance and contra-variance

While studying for a test in my OOP course, I came upon this question which had an answer I didn't really understand. The question is as follows (translated): The programming language "Sava" is ...
4
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1answer
365 views

Contracts for Java Bytecode

Introduction For a paper I need contracts, which are also referred to as Design by Contract (DbC)1, and conceptually go back to Hoare[2]. For my work I need to apply contracts to Java bytecode. The ...
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3answers
1k views

Inheritance, and dynamic access to members/attributes and methods in Java-like languages

I have a question about inheritance in Java-like OO programming languages. It came up in my compiler class, when I explained how to compile methods and their invocation. I was using Java as example ...
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1answer
293 views

Is the type inference here really complicated?

There's a question on SO asking why in Java the right type doesn't get picked in a concrete case. I know that Java can't do it in such "complicated" cases, but I'm asking myself WHY? The (for ...

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