How Does Scanner Goes Through String Which Is Passed To It As Parameter

Feb 7, 2015

How does the Scanner goes through the String which is passed to it as a parameter. For example, String input = "222 dddd 222 ddd22" is passed to the method and here's the code:

Java Code:

public static void sum(String anything)
{
Scanner input = new Scanner(anything)
while(input.hasNext())
{
if(input.hasNextDouble())
{
double nextNumber = inut.nextDouble();
sum += nextNumber
}
......
......
} mh_sh_highlight_all('java');
{

So, how does Scanner calculates a passed String? I just want to know the way it calculates/reads.

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Parse Value Of Array Of Object Passed Through A Parameter

Oct 29, 2014

I'm working on a method that would parse the value of the array of object that I passed through a parameter. I would like to ask if making Object as a parameter is doable. Let's say I have a class Student and Teacher. I created a class the would handle the sched and name it class Schedule and extend this class to the Student and Teacher. Now I want to have a function that will accept an array of Schedule from either Student and Teacher, what ever object I will pass in the parameter. I know its easy to just make a method with a separate parameter of my classes but im looking for a more dynamic code.

class Student extends Schedule{
//variables here for student
}
[code]

class Teacher extends Schedule{
//variables here for teacher
}
[/code]

private void parseObject(ArrayList<Object> objct){
Schedule temp = objct.get(0);
//there is no error in this part

}

Now when i will try to use the function and pass a data, it will not accept since my parameter should be an array of object. How would I twist dis one?

ArrayList<Student> temp_student = new Array....
parseObject(temp_student); // it will not accept my parameter, how would i make it as an object

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String Not Being Passed Into Method?

Oct 20, 2014

The only problem I am having is I cannot get my string plainText to go through the encode and prepareString methods.

Is there something in my methods that is wrong, or is it the way that I am calling them?

What is happening is if I enter "this is a test" as a plainText I am getting the samething back with no changes.

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Can Use Java Scanner With String?

Jan 18, 2010

I couldn't get this code working:

import java.util.*;
public class scan {
public static void main (String args[]) {
String testi;
Scanner scan = new Scanner(System.in);

[Code] .....

Did i write something wrong or can't Scanner be used with String?

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Create New Scanner With The Specified String Object

Jul 4, 2014

//Scanner Test
String stream2 = "ab34ef
56";
// create a new scanner with the specified String Object
Scanner scanner = new Scanner(stream1);
// find a string "World"

[Code] ....

Matched expression found by findInLine: 34

ef56

is new line? right?

The java.util.Scanner.nextLine() method advances this scanner past the current line and returns the input that was skipped. This method returns the rest of the current line, excluding any line separator at the end.

then 56 is in new line and it must return ef.What is the problem?

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String To A Double In Scanner - Performing Calculation?

Apr 23, 2015

This may be a multipart question. Basically I have to write a program that accepts a string, converts it to a double splits it and then performs a calculation.

public static void main(String[] args) {
String input = ""; // initalize the string
boolean isOn = true; // used for the while loop...when false, the program will exit.
String exitCommand = "Exit"; // exit command
String[] token = input.split(("(?<=[-+*/])|(?=[-+*/])"));

[Code] ....

This is the error I get:

Enter a math problemException in thread "main" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(Floa tingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecim al.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at Calculator.main(Calculator.java:22)

[Code] .....

How do I go about actually fixing it. Without that line commented out I get this:

Enter a math problem
2+2 <-What I entered
[Ljava.lang.String;@135fbaa4

Also, how would I go about using the submethods to check for valid operands and operators (also part of the problem) I have the actual lists made obviously, but am unsure how to get those to work with the problem.

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String Including Parameter

Mar 25, 2015

I am taking a parameter of type String and checking if either the city or state contains the "keyword", whatever it may be. I am using an arrayList of 10,000 customers and adding any customer that lives in a city or state that contains the keyword to a new arrayList and then returning that arrayList. I thought my solution was correct, but when using the JUnitTest provided, it is not quite passing the test. My solution is as follows.

Java Code:

public ArrayList <Customer> getMailingList(String keyword){
ArrayList <Customer> key = new ArrayList<Customer>();
keyword = keyword.toLowerCase();
for(Customer c : data){
if(c.getState().contains(keyword) || c.getCity().contains(keyword)){
key.add(c);
}
}
return key;
} mh_sh_highlight_all('java');

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Scanner That Scans Console For Input To Fetch String Word

Jul 28, 2014

I'm having an issue, I have a scanner (Scan.nextLine();) that scans the console for input to fetch the string "word". Then I want to fetch a character using Scan.findInLine(word).charAt(number);. The problem is that the console requires me to write 2 lines in order for the program to move on. I only want the program to scan for a word, and then move on with what it has instead of requiring 2 inputs.

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Reading Input With Scanner And Checking If User Entered Empty String?

Apr 7, 2015

The project is a program that allows the user to enter students and enter grades for each student. One of the requirements is that if there is already a grade stored for the student that it will display the previous grade. IF the user then enters a new grade the new grade will be stored. IF the user simply presses enter (enters an empty string) nothing is done. I have everything working except for the requirement of doing nothing if the user enters an empty string. If I just press enter at this point I get a NumberFormatException.

The below code is a method "setTestGrades" from the student class. This method iterates through each student object stored in an array list and then checks if there is a previous grade (Requirement# unset grades have to default to -1) before allowing the user to set a new grade.

public void setTestGrades(int testNumber) { //Sets the grade for the specified test number for each student in the arraylist.
testNumber -= 1;
Scanner input = new Scanner(System.in);
for (int i = 0; i < studentList.size(); i++) {
System.out.println("Please enter the grade for Test #" + (testNumber + 1) + " For Student " + studentList.get(i).getStudentName());

[code]....

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Test Driver Does Not Accept String Parameter

Jan 6, 2015

I wrote a couple classes and am trying a test driver but it is having an error I do not know how to solve.

Student Class:

public class Student{
private Course[] courseList;
private static int numCourses;
private final int maxCourses;
public Student(int max){
maxCourses = max;

[Code] .....

Error:
javac tester.java
tester.java:6: error: cannot find symbol
one = new Course(name);
^
symbol: variable name
location: class tester
1 error

Same issue, just only one error as there is only one line. It seems like it does not accept my parameters as it cannot find symbol.

I forgot to put the "" in the brackets, it's been a month since I have looked at any java and made this simple mistake.

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Code Not Running Scanner NextLine After Using Scanner NextInt?

Feb 14, 2015

package jdbc;
import java.sql.*;
import javax.sql.*;
import java.util.*;
public class Jdbc {
public static void main(String[] args) {

[code]....

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Nested For Loops And Strings - Take A String As Parameter And Store It In S

Oct 11, 2014

Question: 1. Declare and implement a class named Substrings. The class will contain the following data members and methods:

Data members:
string S

Methods:
setS() take a string as a parameter and store it in S
printSub1(), printSub2(), printSub3(), printSub4() print all substrings of S. If S = "abcd",

printSub1() will print "a", "ab", "abc", "abcd", "b", "bc", "bcd", "c", "cd", "d",
printSub2() will print "abcd", "bcd", "cd", "d", "abc", "bc", "c", "ab", "b", "a",
printSub3() will print "a", "b", "c", "d", "ab", "bc", "cd", "abc", "bcd", "abcd", and
printSub4() will print "abcd", "abc", "bcd", "ab", "bc", "cd", "a", "b", "c", "d".

Alright so after doing some googling and watching tutorials I managed to put together the first two but I still don't exactly understand how nested for loops work, however just a single loop I do understand.

Secondly, the 3rd and 4th prints are completely destroying my brain using for loops, which we are supposed to use. Check out my code below, also keep in mind the 3rd is giving errors and the 4th i had to revert back to the same as the first print temporarily because my code because so messed up. How to understand nested for loops better.

[code=Java]

import java.util.Scanner;
class subString {
String S;
void setSubstring(String SS) {
S = SS;

[Code] .....

Compiling: error for myS.printSub3 and myS.printSub4 is the same as 1 because i had to revert it after ruining the code.

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Sep 29, 2014

I have this class:

package model;
import java.awt.Color;
import shapes.Oval;
import shapes.Rectangle;
import shapes.Shape;
import java.awt.Container;
import java.lang.reflect.Array;

[Code] .....

And as it is now, the values are not being passed into the shapeArray array. If I "hard code" two shapes into the array in this class, everything works fine later on, but I do not manage to pass values into the array from the createShape() method. I tried several approaches, nothing works.

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Changing Variables That Are Passed In?

Apr 11, 2014

I'm having some trouble figuring out how to change the value of a variable that is passed into a class. I've tried just changing the variable, I've tried changing it by using the this.variable command, and I've even tried calling the setter class from within the class to change it, but it's still not working right. The first class is the one with Main in it and I just feed it some dummy data:

public class ExamConverter {
public static void main(String[] args) {
// TODO Auto-generated method stub
Age testAge = new Age();
 
[Code] .....

This is the other class to calculate the age the way we do it on psych tests - it might not be mathematically accurate, but it's what all the tables and such for raw to scaled score conversion are based on, so the math needs to be the same as opposed to "accurate" because of some months having 30 or 31 days, etc.

public class Age {
//==================Properties==================
// Variables for the test date and client date of birth
private int TestMonth;
private int TestDay;
private int TestYear;
private int ClientMonth;
private int ClientDay;
private int ClientYear;
 
[Code] ......

Based on this dummy data, the output is:
Test: 5/4/2014
DOB: 5/5/1971
Age Years: 43 Months: 0 Days: 0

However, it should be:
Test: 5/4/2014
DOB: 5/5/1971
Age Years: 42 Months: 11 Days: 29

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Aug 7, 2014

If I have a method that takes an ArrayList of a class called Piece and it uses the setPosition() method from Piece. It is changing the value of the array that I passed in, but I want the ArrayList to stay the same outside of the method. Is there any way I can change only the values on the inside of the method, but keep the same position values outside the method?Here is an example.

Piece class
Java Code: public class Piece {
private int xCoor;
private int yCoor;

[code]....

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Apr 22, 2015

I am writing a simple program in Java, where I call a method and pass some variables (namely, min and max) as arguments. This method is recursive, so the same arguments are again passed on in each recursive call.

I need to update these variables in recursive calls so that when the calling method uses them, it uses updated values. As it might sound confusing, here is sample code :

// Function 1.
void func1() {
//Call func2.
func2 (int hd, int min, int max, Map<String, String> map);
//Other stuff.
}
// Function 2.

[code]....

As you can see, min and max are updated after each recursive call returns, based on conditions. However, these changes aren't reflected in original min and max, which were used by func1 while calling func2. As far as I know, this happens due to call by value mechanism being used by Java while passing arguments. If I declare min and max as instance variables in the class, my problem is solved. But, I want to know whether there's any other way to update these variables so that changes in original min and max are reflected. Yes, I can return them as an array of 2 elements each time while returning, but it didn't seem a good solution to me.

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May 29, 2014

I have an html form with 200 input fields of type text. The first input field contains the name of a book author and the remaining 199 fields hold each a title of a book that he or she has written. I also have a servlet that processes the form data and sends it to a file. The entered data is restricted to a combination of the characters "a...z A...Z". how do i go about with creating my html page. The input fields are just too many, how to retrieve the 200 values in servlet.

<html>
<head>
<script>
var k;
function testField(Expression){
k=1;
var str1="abcdefghijklmnopqrstuvwxyz ";
var sor=Expression;

[code]....

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Oct 11, 2014

my arraylist is declared in my main method. A string that i will be calling on is declared in my main method as well. The arraylist and string is passed to a method outside the main. I am to search for the beginning of a string and end of the string, remove those items. Then i am to pass the string with the removed items to arraylist that is called in my main with an enhanced for loop. The for loop then displays what is needed from the string and the method i created. I will posting an example of my main and method that is used in my program.

public class ExampleUrl {
public static void main(String[] args) throws MalformedURLException, IOException {
ArrayList<String> urlList = new ArrayList();
String url = "";

[Code].....

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Sep 30, 2014

How are methods invoked on the `bird` parameter?

next.xhtml:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">

[Code] ....

`MyQueueBean` is intended to give out a bird once only, to exactly one end-user. Because it's application scoped, and not session scoped, getting attributes directly from the bean would give inconsistent results.

The birds application is from Facelets Essentials Guide to JavaServer Faces View Definition Framework: [URL] ....

how is the variable passed to the file? Once it's passed, how is it referenced?

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Mar 31, 2014

I tried to Google, but was not able to find anything relevant.

I have a sql query where in I am using preparedStatement which goes something like :

select * from test where parameters in ( ?,?,?,?,?,?,?,?,?,?,?,?,?);

Is there a limit on how many "?" characters i.e. parameters can be there in this query?

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Sep 18, 2014

public static void main(String[] args) {
boolean t=false;
long cuTime = System.currentTimeMillis()
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;

[Code] ....

I tried this and it includes a while loop as the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop

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public static void main(String[] args) {
boolean t=false; 
long cuTime = System.currentTimeMillis();
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;

[Code] ....

I tried this and it includes a while loop. therefor the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop...

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Sep 18, 2014

public static void main(String[] args)
{
boolean t=false;
long cuTime = System.currentTimeMillis();
while(t==false)
{
System.out.println(cuTime);

[code].....

I tried this and it includes a while loop as the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop

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I have a webform on JSP page which has several parameters(strings and integers) values and a file to be uploaded to the server through a servlet. It is strange to see that i'm able to upload the file on to the server but not able to get the rest of the parameters in the servlet using request.getParameter("someString") .

<form method="POST" enctype="multipart/form-data" action="/cassino/uploadFile" >
<fieldset>
<div class="form-group">
<label >*ID riparazione</label>
<input type="text" name="idRiparazione" />

[Code] ....

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I thought static methods could never use instance variables, because they wouldn't know which instance to look at.

From Head First Java, p. 284: "A static method is not associated with a particular instance - only the class - so it cannot access any instance variable values of its class. It wouldn't know which instance's values to use."

Now I was answering some mock exam questions from Cameron McKenzie's SCJA book, and I don't understand one of the options. On page 205, the last question has an option that says: "Instance variables ... are not visible in static methods, unless passed in as arguments." This option is supposed to be correct. Now... how does that work?

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