Permutations In Java

Oct 2, 2014

I have 5 numbers between 0 to 13 in ascending order stored in an array. They may have repeats. I want to perform permutations and figure out the number of running pairs (minimum 3 numbers in a pair. Ex- 012, 345, 456, 1234, 78910) that I can make with these command line inputs that I get.

Lets say my user input was 01123. For this sequence I'll have the following pairs-

012
012
1234
1234
123
123
0123
0123

There are same repeated sequences because there are two 1's hence same pairs using different 1's.I have the input in an array so I'm wondering if there is any inbuilt class for arrays that would let me do this. If not, whether I can pass it into a collection and then find its permutations. Following which I traverse through the sequences and update a count for each running pair generated to pass onto an array in another variable to perform some other functionality. If this is viable how to implement this in code ? I'm new to java and am not familiar with the classes available.

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All Permutations Of 2 Coordinate Int Array

Apr 12, 2014

I have a set of 2D arrays, structured as so: int[][] cage = new int[someLength][4]. Each array has a set column length of 4; the first two columns are all that concern us with this problem. They are used to define the row and height respectively of a point (e.g. 2,4).

What I need is to generate all possible permutations of the points using both row and column coordinates from the 2D array. I found a working method to generate all permutations for 1D array of ints here: [URL] ..... , under update 2 of the first answer.

Here is an example of a possible input and corresponding output desired:

In: (1,0)
(1,1)
 
Out:(1,0),(1,1)
(1,1),(1,0)

Ideally the result will be stored in a 2D array of ints.

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All Permutations Of 2 Coordinate Int Array?

Apr 12, 2014

I have a set of 2D arrays, structured as so: int[][] cage = new int[someLength][4]. Each array has a set column length of 4; the first two columns are all that concern us with this problem. They are used to define the row and height respectively of a point (e.g. 2,4).

What I need is to generate all possible permutations of the points using both row and column coordinates from the 2D array. I found a working method to generate all permutations for 1D array of ints here: My link, under update 2 of the first answer.

Here is an example of a possible input and corresponding output desired:

In: (1,0)
(1,1)
Out:(1,0),(1,1)
(1,1),(1,0)

the result will be stored in a 2D array of ints.

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How Code Is Getting All Permutations Of A String With Recursion

Aug 7, 2014

how the code is getting all the permutations of a string with recursion. The following code works correctly but I am having trouble grasping what it is doing.

public class Main {
private static void permutation(String prefix, String str){
int n = str.length();
if (n == 0)
System.out.println(prefix);
else {
for (int i = 0; i < n; i++)
permutation(prefix + str.charAt(i),
str.substring(0, i) + str.substring(i+1));
}
}
public static void main(String[] args) {
permutation("", "ABCD");
}
}

I see that each character is being appended to prefix through each iteration. So I know it adds "A" then "B" etc etc. I can follow it up until the "D" is appended to the prefix string. After that I don't understand how the D moves back to the str string and then the C moves back to str followed by the D moving back to the prefix string. I have stepped through the code many times in my debugger but still don't see how it moves back to str and knows to send D to prefix and not to send C. I feel I don't understand how recursion behaves therefore I can't follow.

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Oct 24, 2014

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I tried both options using NetBeans but I'm getting errors everywhere starting with the library import. I'm pretty new to Java so I'm sure I'm missing a lot of things here. I pasted the code below from the OpenScript framework that want to use in a stand-alone file for your reference.,
 
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import oracle.oats.scripting.modules.browser.api.*;
import oracle.oats.scripting.modules.functionalTest.api.*;
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[Code] ....

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Apr 9, 2015

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I've set the CLASSPATH to /home/user/src..All of the source files have "package com.myfirm.program" on the first line.I compiled the application with:

javac -d . File1.java File2.java File3.java (etc...)

the compiler created the directory: /home/user/src/com/myfirm/program and put all of the .class files in there.So how do I get the program to run? if I run from /home/usr/src

java File1

I get: Exception in thread "main" java.lang.NoClassDefFoundError: File1 (wrong name: com/myfirm/program/Program)

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CircleCalculationMethod.javaMain.java 

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I use Eclipse software

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Second Question is.

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elease s.0.1.55deploy"
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So my question is how do I do this?

I tried this, (just copy paste the command):

package MyProject;
 import java.io.IOException;
import java.io.InputStream;
 public class Cmd {
 public static void main(String[] args) {
try {
final Process process = Runtime.getRuntime().exec("start "" /D "C:Riot GamesLeague of

[code]....

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Feb 4, 2014

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For either, what we are looking for is:

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public int creategroup(String groupname, String description){
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ASP:

If Request("action") = "results" Then
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aYear = cint(Request("selYear"))
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[code]....

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Here's the video I was watching: Video

And here's my code:

import javax.swing.*; //Imports JFrame and JButton for use
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.*;
import java.awt.*;
import java.awt.event.*;
public class swing

[code]....

The reason why I'm importing some many things is I'm trying everything to try fix my problem.

He's the error messages I'm getting:

frame2.add(panel);
^
C:UsersWindows 8Documentsswing.java:42: error: illegal start of expression
frame2.add(panel);

[code]....

I used to make the button just create another frame without additional labels but I changed it to be even more similar to his program just to rule everything out. Also initially my program varied quite a bit, I've changed everything to be like his. Even without the ";" error I got, I kept telling me I was not allowed have my class as static, even though the guy in the video has it set to static. Also I don't think my "setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);" is working as it doesn't change color.

I think the problem is with my panel, it isn't adding to the frame for some reason.I'm using TextPad7 and I'm using Win8.

C:UsersWindows 8Documentsswing.java:42: error: '(' or '[' expected
frame2.add(panel);
^
C:UsersWindows 8Documentsswing.java:42: error: illegal start of expression
frame2.add(panel);

[code]....

I would also like to point out that some of the comments are out of date and are referencing the way the program was before I made it just like his. For example I know my second class isn't inheriting the first class.

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Apr 27, 2014

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<?xml version="1.0" encoding="UTF-8"?>
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[Code] ....

The output will be :

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addresses_address
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addresses_address_street
addresses_person
addresses_person_name
addresses_person_age

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import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
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