My assignment is to essentially update a calculator program that uses strings, and methods, to include arrays. How to create and call an array that the user defines the size of and then inputs the numbers to fill the array. Here's the example my prof gave us of what the output should look like:
Menu 1. Add 2. Subtract 3. Multiply 4. Divide 5. Dot product 6. Generate random array 7. Quit
What would you like to do? 1
How many values are in the arrays? 3
Enter the values in the first array, separated by spaces: 2 4 6
Enter the values in the second array, separated by spaces: 1 3 5
The result is [3.0, 7.0, 11.0]
How to create an array that would allow the user to define the size of the array and then inputs the values for the array? I'm completely lost. I never should have taken java as an online class.
WAP which takes two string as input from the user (a & b).This prog should print two strings as output (a1 & b1).
(a1) should contain all the characters which are present in (a).but not present in (b). (b1)should contains all the characters which are present in (b).but not present in(a).
I am just learning arrays or rather teaching myself about them and I am not to sure how they work and why. I understand that in order to set one up you do
int[] example1; example1 = new int[]{01, 02, 03, 04};
But I don't really understand is why if you only need 3 data integers, why put the 4th one in?
Also with outputting data, I understand .print() and .println() but I am not to sure what .printf() does and then the formatting after that.
System.out.printf("%3d%11") // and then what you want to print
I've been working on a question using parallel arrays where the user inputs an integer 1-12 and the output will be the name of the month and the number of days in that month. This is what I have so far
import java.util.*; public class DaysMonth { public static void main (String args[]) { Scanner keyIn = new Scanner(System.in); int[] days = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
How could I store the currency and amount in an array? A 2x2 array would do this but how to store them and retrieve them is the challenge. For example, I have a method that asks the user for two inputs, the currency and the amount and using the array as a chat table where I could map the currency to the the currency input entered by the user, I could do some calculations with the amount entered by the user. how I could represent the 2x2 array?
I want to create a program which contains a list with 5 items and a button on the first display. The desired option is chosen from from the list and the button is pressed. On pressing the button it must open a new form which corresponds to the chosen item from the list.
I am having an array of strings and i want to find out whether these strings contained in the array contain a similar character or not.For example i am having following strings in the array of string:
aadafbd dsfgdfbvc sdfgyub fhjgbjhjd
my program should provide following result: 3 because i have 3 characters which are similar in all the strings of the array(f,b,d).
I want to implement session timeout functionality ...so with web.xml file i can specify session timeout ..say 30 min.. Now with filter is it possible for me to redirect the request to login page after session is timeout say after 30 min... What are the other ways...??
Also i want to know whether timeout setting in web.xml will overweight the application server timeout ... I am using struts 1.0 and hibernate...
I can sort strings in a collection by uppercase and then lowercase though I was wondering if there is any way of doing it in reverse, sorting by lowercase then by uppercase.
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.
my output fails to display me the 2nd output.Here's my code.
import java.util.Scanner; public class year { public static void main (String [] args) { Scanner console = new Scanner (System.in); System.out.print("Enter the choice of book(A-ABC,D-EFG):"); String x = console.next(); System.out.print("Enter the rate (1-3):"); int y= console.nextInt(); System.out.print("Enter number of kids reading:"); int k = console.nextInt();
[code]....
When I key '0" for kids, it did not appear the second print out. I don't want the first print out to be the output.
Its supposed to notify the user if they have a palindrome, but keeps returning true even when I type, "hello".
import java.util.Scanner; public class PalinDrome { public static void main(String[] args) { String line; Scanner input = new Scanner(System.in); System.out.print("Please enter a word ");
I need my code to print out the top three most common IP Addresses in the ArrayList. Right now I have it printing out the top IP Address. I am a little confused as to how to get it to print out three. Every time I change something, It doesn't give me the correct results
My Code: public class Log_File_Analysis { private static ArrayList<String> ipAddress = new ArrayList<>(); private static String temp , mostCommon; static int max = 0; static int num = 0;
public static void main(String[] args) throws Exception { String s = "oldString"; reverse(s); System.out.println(s); // oldString } public static void modifyString(String s) { s = "newString"; System.out.println(s); // newString }
I thought the first print statement would print "newString" as String is an object, and when we pass objects between methods, changing state of the object in any method reflects across the methods.
So the while loop I am trying to use is: while( type != "EXIT" ) { type = input.next(); }
The problem is that typing in EXIT doesn't end the loop like I want it to. I also tried input.nextLine(); but neither of them work. The loop is being used to fill an ArrayList so the number of elements can change based on how many they want. What am I doing wrong, or what alternatives do I have?
covers switch statements and if/else statements. Java doesn't like the Strings for some reason. My instructor does her strings just like this and it works for her. I can figure out the rest of the program if I can only get around the: "java error35: sSymbol variable might not have been initialized.
import java.util.*; public class RockPaperScissors { public static void main(String[] args) { //generate outcome int symbol = (int)(Math.random() * 4); String sSymbol;
