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Java Collection Q&A » hash » Array 

1. Java Array HashCode implementation    stackoverflow.com

This is odd. A co-worker asked about the implementation of myArray.hashCode() in java. I thought I knew but then I ran a few tests. Check the code below. ...

2. Initialize Java Generic Array of Type Generic    stackoverflow.com

So I have this general purpose HashTable class I'm developing, and I want to use it generically for any number of incoming types, and I want to also initialize the internal ...

3. Fast hashing of 2-dimensional array    stackoverflow.com

I'm building a Reversi player using the standard alpha beta pruning search algorithm. I'm trying to add a translation table to store previously calculated nodes in the search tree. So I ...

4. I am in need of a method of storing many different items in a list    stackoverflow.com

I have a program written in java that desperately needs to be optimized. Right now i have 3 ArrayLists that i would like to be simplified into 1 list type thing. ...

5. Compare two arrays by hash code    stackoverflow.com

I have two instances of the same class:

Object instance1;
Object instance2;
I know that the class in question has an array field. I need to compare the identityHashCode of the array field, ...

6. Storing arrays in Set and avoiding duplicates    stackoverflow.com

HashSet<String[]> boog = new HashSet<String[]>();
boog.add(new String[]{"a", "b", "c"});
boog.add(new String[]{"a", "b", "c"});
boog.add(new String[]{"a", "b", "d"});
results in
[a, b, c]
[a, b, d]
[a, b, c]
where [a,b,c] is repeated, so the hash function is not working ...

7. Use hashcodes to compare two large strings in java?    stackoverflow.com

I have two files which I am reading from, I have some lines that are found on both files. I need to write a function that will detect which lines are ...

8. Java Arrays.hashcode() weird behaivor    stackoverflow.com

I have an object which has one field- double[] _myField it's hashcode is

public int hashCode() {
    final int prime = 31;
    int result = 1;
 ...

10. Hash Set and 2d Array    forums.oracle.com

Im making a Sudoku game, and i have a grid in the form of a 2d array and read in a txt file to fill the grid. Im working on the solver and starting with hidden singles/pairs/triplets etc. To find the possible numbers for each cell i have used a Hashset. Before i continue with this and not waste my time ...

11. Find array index from hashCode()    forums.oracle.com

I am making a hash set for a project. I am supposed to use java.lang.Object.hashCode() for the hash function. This returns any integer yes? So my internal hash table is an array, with an array size much smaller than the size of integer. Let's say the internal hash table has an array of 10 elements to start with, and the hash ...

12. HashCode for Arrays    forums.oracle.com

But in future, my map may have Height, City and Country. So in Row only Name & Gender are enough to get the First name of a person . But in some rows you may need Age, Height & weight too. So each time , the no of attributes making the key varies. So i defined an array in the Description ...

13. hashCode() of arrays    forums.oracle.com

You cannot even use Generics because it's an array of primitive types! You're programming in Java. All languages make compromises. Java favours security, so you can't monkey patch the Array implementation, and uses primitives to make implementing an efficient VM easier. Generics were added as an afterthought in a way which allows backwards compatibility, and so aren't as powerful as metaprogramming ...

14. arrays, recursion and hash codes    forums.oracle.com

System.out.print("entered - "); currState.printState(); System.out.println("Hashcode - " + currState.stateArr.hashCode()); for (Integer temp:currState.stateArr) { System.out.print(temp); } System.out.println(":"); if (positions.closed.contains(currState.stateArr.hashCode())) { // System.out.print("closed - "); // currState.printState(); return null; } positions.addToClosed(currState); // System.out.print("processing - "); // currState.printState(); if (currState.stateArr.equals(goalState.stateArr)) { currState.printState(); return currState; } successors = positions.expand(currState); for (State successor:successors) { recurseDFS(successor, goalState); } depth--; return null; } } and the output for ...

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