Comparing Two Arrays With Same Size
May 7, 2013
Is it possible to compare 2 arrays as below if they have same size?
Int array[][] = new int[10][10];
array1[I] == array2;
Or assign the whole array to another array?
array1[I] = array2[I];
Suppose I have 2 arrays, 1 is old, and 1 is new.
I will do the calculation to update the new array.
Then, I will compare between the 2 arrays.
If they are the same, I will stop the calculation.
If they are not the same, I will assign the new array to the old array.
Then, I will do the calculation again until the old array and the new array are the same.
As I do not want to write a loop to compare and assign the value to the arrays. May I compare or assign the values to the whole array directly.
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May 5, 2015
I’ve been working on this problem for a couple days already but I came to a point where I don’t really know what to do. Basically I’ve got two arrays filled with int values (0, 1, and 2), which I get from Class B through their respective getMethods.
1 stands for black and 2 stands for something else.
The program counts how many times the value 1 (if chosen color is black) occurs in both arrays and then compares the both counts. If it detects any difference the program does something else, otherwise it waits.
public class A {
private static boolean finished;
public A() {
B objectClassB = new B();
int[] numbers = objectClassB.getNumbers();
int[] numbers2 = objectClassB.getNumbers2();
String color = objectClassB.getColor();
[Code] ....
Here the class B.
public class B {
private int[] numbers = new int[] { 2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 1 };
private int[] numbers2 = new int[] { 2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0 };
private String color = "black";
public B() {
}
public int[] getNumbers(){
[Code] .....
this would be the Output:
[2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 1]
[2, 2, 0, 2, 1, 0, 1, 2, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0]
number of black tokens of first array: 8
number of black tokens of second array: 7
the number of black tokens has changed
The actual problem is that I will be getting one array at a time (meaning: the array int[] numbers from Class B updates itself and might change its values). I just declared and initialize both arrays for illustration purposes.
That would mean I need to hold the array’s values the first time I get them in a temporary variable until I get the values of the updated array. Then I could use them in the method –numberOfRelevantElements- and check if any changes have occurred.
What would be the best approach for doing this? I though of inserting the different counts that I get into a queue and then comparing these values one after the other. But I’m not really sure if that would work.
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Mar 4, 2015
I have been stuck on this for the past 2 hours, basically we have to compare user input, put user input into an array and compare for equivalency. An example of the program:
Array 1: 1 2 3 4 5 6 7 8
Array 2: 1 2 3 4 5 6 7 8
Array 3: 1 2 3 4 5 6 7 8 9
Array 4: 1 2 3 4 5 6 7 8
Array 1 & 2 are equal
Array 1 & 3 are not equal
Array 1 & 4 are not equal.
This cannot be done by importing Java.util.Array at all!! (my research only find this to compare arrays ) which is why I am having trouble starting off. My code thus far:
import java.util.Scanner;
public class Lab07b {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter Integer 1:");
int a = input.nextInt();
[Code] .....
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Jun 28, 2014
I mainly would like to know is a int[4][4] or a int [4*4] is more efficient to use. Which takes more storage? Which requires more to process? that kind of stuff.
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Mar 30, 2014
Let's get it out of the way -- I'm stumped. On something that should be pretty simple to solve. Code follows.
public class Sum {
public static void main(String [] args) {
Double nSum = 0.0;
Double aDouble = 100.0;
for (int i = 0; i < 1000; i++){
nSum += 0.1;
[Code] ....
The output:
100.000000
100.000000
false
false
false
false
false
Process finished with exit code 0
I wrote another simple program and hardcoded the values: aDouble = 100.0; bDouble= 100.0000
Using aDouble.equals(bDouble) returns true, just as one would expect.
So what am I overlooking?
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Mar 3, 2015
I have a simple question but I dont understand why I am getting false for this boolean statement.
System.out.println("hash compare " + (trialSearch.returnHash() == fish.returnHash()));
System.out.println("fish.returnHash()" + (fish.returnHash()));
System.out.println("trialSearch.returnHash()" + (trialSearch.returnHash()));
the output is as follow:
hash compare false
fish.returnHash(){T=[1, 2, 3, 5], G=[], A=[0], C=[4]}
trialSearch.returnHash(){T=[1, 2, 3, 5], G=[], A=[0], C=[4]}
why is it printing false for the boolean statment when the two hashmaps contain the same values and keys?
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Nov 6, 2013
I'm trying to create an algorithm that compares the first names of two people, which goes ahead and cancels similar characters and then counts the remaining characters to give a 0 if the remaining characters are even and a 1 if the remaining characters odd.
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Apr 25, 2015
I am making a program i want String length and compare it that it will be null or not but it gives me error.
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Nov 8, 2014
I am trying some exercises on codingbat.com, and am stuck at the following program.
"Given a string, return true if it ends in "ly"."
With the following lines, if I type a print command instead of return, I get "ly". Yet if I aks to compare the result (which is "ly" as I can see with a print command) with == "ly", I get false?
What I also don't get, is that if I tye the programs in javascript, in that language the program works.
String str = "Oddly"
return ((str.substring(str.length()-2))== "ly");
}
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Aug 2, 2014
I'm working on a program with the following instructions: Write a class named Octagon that extends GeometricObject and implements the Comparable and Cloneable interfaces. Assume that all 8 sides of the octagon are of equal size. The area can be computed using the following formula
area = (2 + 4/square root of 2) * side * side
Write a program (driver) to read in a series of values from a file, display the area and perimeter, create a clone and compare the object and its clone (based on the area). In addition, your program should compare the current object (just read in) with the first object read in. The program ends when a negative number is read from the file.
My GeometricObject abstract class:
public abstract class GeometricObject {
public abstract double getArea();
public abstract double getPerimeter();
}
My Octagon Class:
public class Octagon extends GeometricObject implements Comparable<Octagon> {
private double side = 1.0;
protected native Object clone() throws CloneNotSupportedException;
public Octagon() {
}
public Octagon(double side) {
super();
[code]....
As you can tell, I've still got a long way to go in the tester class but this is where I'm running into some difficulties.
You'll notice that in the return statement of the toString method in the Octagon class, I put a ? after the "Clone Compare:" portion of the code, what should go here. I've never worked with either the Comparable or Cloneable interfaces before.
How I should create my objects in a way that would give the following sample output.
Object 1: Area: 120.71
Perimeter: 40.0
Clone Compare: Equal
First Compare: Equal
Object 2: Area: 271.60
Perimeter: 60.0
Clone Compare: Equal
First Compare: First is smaller
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Jan 24, 2015
I have tried to compare word in same line..instally i divided words using split...after that my move got stopped....
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May 24, 2014
I was writing a code to have the library books classified in name, author, area, ed, etc. I'm using NetBeans and it doesn't accuse any error. But when I run the project, it never goes right and shows the books only in one area, regarthless what I type. (The goal of the algorithm is to separate the books in areas (sciences, humanities and biological science).
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Apr 20, 2014
Ok I am trying to compare a string to see if all characters are unique. If there is a library for this or a better way to approach this do tell. However I find it important to understand what is going on behind the scenes. The issue is that the program counts the spaces '/0' and therefore everything will never be unique.
public class CheckUnique
{
private String sentence = "This will be compard";
private char[] checker;
private String isUnique = "The sentence is unique";
private String notUnique = "The sentence is not unique";
[code]...
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May 3, 2014
I have to make a program in which users inputs a number and the program should search into a two dimensional array and print out all the values that are below the number This is my first time experimenting with 2D Arrays and how to do this program I have the array set up
String firstarray[][]=
{{"", "Store101", "Store102", "Store103", "Store104"},
{"Tennis Shoes", "102", "54", "20", "78"},
{"Sweaters", "45", "25", "35", "75"},
{"Jeans", "12", "35", "45", "65"},
{"Shorts", "54", "25", "34", "45"},
{"Jackets", "15", "35", "50", "25"}
};
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Jan 27, 2015
This program accepts Student ID numbers, Name, and grade point average. The problem I am having is with the if else statement that compares id to studentID[x]. I have tried to compare using if(id.equals(studentID[x])) and also I have tried using if(id == (studentID[x])) as shown in the code below. I keep getting incorrect results though.
//FILE: StudentIDArray.java
import javax.swing.*; //Used for the JOption dialog boxes
import java.util.*; //Used for Scanner input
[Code]....
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Apr 30, 2014
what will i compare in if statemet is the 1st letter of each if i have code="a" and name="Angelina" first letter of each is "a" and "A" then in convert it to string so that i can make it uppercase but when i compare it in if statement it always go into "not x" but the ouput that im getting is x=A y=A then it always direct me into else statement.
String code = "a";
String name = "Angelina";
char c = code.charAt(0);
char n = name.charAt(0);
[code]...
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Mar 7, 2014
I want to compere two element of string array by each other! eventually I want to print Yes or No in matrix . SO, I start reading data from file then split them into two parts .
File file= new File(fileName);
try {
inputStream = new Scanner(file);
while (inputStream.hasNext()){
String data= inputStream.next();
String [] token =data.split(",");
System.out.println("day"+token[0] +"embloyee name:"+ token[1]) ;
}
inputStream.close();
Now I want to compere each cell from token[0] by another array :
String[] day= { "Sunday", "Monday" ................};
if the days are equal then I want print yes in front of the employee name if not then i want to print No..is this gone work with me as I imagine it to be or do I have to take few more steps to get my code going?
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Sep 23, 2014
I want to check to see if given integers digits a, b are both positive or both negative. How do i do that in java.
how to check below number 'a' is negative or not in if condition using signum method?
if(Integer.signum(a)==-1){
Above line is not working
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Jan 6, 2014
I have to write a diff which will compare two txt files, diff have to return changes and additional lines in console with indicating in what file and line.
Example:
File1:
This is war
on the front.
Flying is cool.
File2:
This is war
on the beach.
Something here.
Flying is cool.
Result of this should be:
Changed lines:
line2/line2 - on the front./beach.
file1 line2 on the front.
file2 line2 on the beach.
Additional lines:
file2 line3 Something here.
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Oct 17, 2014
I have the following code:
Java Code:
public class Equals {
String[] s1 = {"red", "white", "black", "blue"};
String[] s2 = {"red", "black", "green"};
String[] s3 = {"red", "green"}; mh_sh_highlight_all('java');
What I need is to give me the following output:
Select Strings: s1,s2,s3
Comparing String s1, s2, s3
red 3 matches.
black 2 matches.
green 2 matches.
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Jan 25, 2015
I am writing a program that calculates the prices of 4 items from a menu after the user inputs how many of each item. I need to print which item cost the most. Is there a simple way of coding this or do i need to code a bunch of if else statements. Here is what I have so far.
import java.text.NumberFormat;
import java.util.Scanner;
public class Assignment2 {
public static void main(String[] args){
Scanner in =new Scanner(System.in);
NumberFormat fmt1 = NumberFormat.getCurrencyInstance();
[Code] .....
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Oct 30, 2014
I am making the card game War, I have gotten fairly far without a huge snag but I have been working on this. I need to compare 2 cards to find the larger of the 2. I have a function that will do that, but it is comparing the wrong numbers. The function is comparing their index values but I need it to compare the card value. The card value is found at rank(card).
import java.util.Random;
import java.util.List;
import java.util.ArrayList;
import java.util.Deque;
import java.util.ArrayDeque;
import java.util.LinkedList;
import java.util.Collections;
[Code] ....
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Oct 17, 2014
I have the following code:
public class Equals {
String[] s1 = {"red", "white", "black", "blue"};
String[] s2 = {"red", "black", "green"};
String[] s3 = {"red", "green"};
What I need is to give me the following output:
Comparing String s1, s2, s3
red 3 matches.
black 2 matches.
green 2 matches.
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Dec 4, 2014
I have a little problem in my code. Using a threaded binary tree and inorder traversal check if every next element is equal to the previous element + 1. You are allowed to use additional functions as long as they are not recursive. I have implemented everything. Problem is that i cant compare elements as i should. They are type E.
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.NoSuchElementException;
import java.util.ArrayList;
[code]....
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Oct 22, 2014
I am looking to reconcile data between SQL server and Oracle DB post the migration, I need to verify the data (rows/columns) for last 10 years, Before i start writing a Java Utility to accomplish this, My question is are there any existing libraries or API which can accomplish the same ....
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Mar 16, 2015
I have an ArrayList, based on the class which stores cricket players, their names and runs scored.When I use the Collections.sort() method my arraylist is sorted alphabetically by forename.how to OverRide the comparing method to sort by runs, and thus the code I use to sort the list?
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