If I code:
int num0=0,num1=1,num999=999;
System.out print(num0+","+num1);
System.out println(","+num999);
I believe I'll get: 0,1,999 but I want 0000,0001,0999 i.e. a width of 4 for small integers.
I have the following code....................
double[][] cmMatrix = eval.confusionMatrix();
for(int row_i=0;row_i<cmMatrix.length; row_i++){
for(int col_i=0;col_i<cmMatrix.length;col_i++){
myConsole.getOut().println(cmMatrix[row_i][col_i]);
myConsole.getOut().println("|");
}
myConsole.getOut().println();
}
What do I need so that each row is printed out on a single line ?
I am aware that the default value of char is 0. But in this program I am getting some unexpected output
public class TestClass12{
static int[] ia = new int[1];
static char ch;
public static void main(String args[]) throws Exception{
System.out.println("ch:"+ch+" ia[ch]:"+ia[ch]);
}
}
Output:
ch: ia[ch]:0
If you see the above output ch is printed as a blank space instead of 0, while the array default value is correctly printed by taking the char default value as index. Why is ch printed as blank space?
Write a program to request a student number and their marks in 4 subjects. The program must print the student number, total marks and average mark. All outputs should be printed with suitable labels
This is the error am getting
Scanner get = new Scanner (System.in) - got a red line
int student number, total marks, average mark - got a yellow bulb with a red exclamation mark on it.
I just dont understand where the errors is where what the system dont have ... I am using netbeans ....
Write a program that prompts the user to input an integer and then outputs both the individual digits of the number and the sum of the digits.
Now I have a code for spacing out the integers, and I have a separate code for adding the digits. But I am not sure how to merge them together. Both of them work independently
Spacing code:
import java.util.*;
public class SumoftheIntegers
{
static Scanner console=new Scanner(System.in);
public static void main(String []args) {
int num1, test, rem;
int counter = 0;
[Code]...
Now the sum of the integers code:
import java.util.Scanner;
public class sum
{
public static void main(String[] args)
{
// Create a Scanner
Scanner input = new Scanner(System.in);
// Enter amount
System.out.print("Enter an integer: ");
int integer = input.nextInt();
[Code]...
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};
[Code] ....
After I enter the user int it just ends.
i want to create a program in java which counts the number of prints taken from a printer..
View Replies View Relatedthe number of lines that can be printed on a paper size, the point size of each character in a line, whether lines are double-spaced or single-spaced,the top and the bottom margins of the paper. assume that all characters are of the same point size, and all lines are either single-spaced or double-spaced. note that 1 inch = 72 points. make over, assume that the line are pointed along the width of the paper. for example, if the length of the paper is 11 inches and the width is 8.5 inches,then the maximum length of a line is 8.5 inches.write a program that calculates the number of characters in a line and the number of lines that can be printed on a paper based on following input from the user.
a.the length and width, in inches, of the paper.
b.the top, bottom, left, and right margins.
c.the point size of a line.
d. if the lines are double-spaced, then double the point size of each character
I am trying to have a user select from a printed out array list, instead of having the user type in the "bill type" each time there is a bill to avoid user error as much as possible. For example I would like to have it print out like this:
"Select bill type from list:
1. Rent
2. Car
3. etc..."
and I would like the user to choose a number and not type in the "bill type". I don't want to use "Switch case" because it would need to be an expanding and I don't think "switch case" can do that.
Here is the code:
package homebudget;
class Spending
{
//Do i need a totalAmount variable?
String type;
double amount;
int year, month, day;
public Spending()
[Code] ....
case 2:
//Give option to enter a new expense or pick from list.
//How to do this? If Statement that doesn't list duplicates, or a while search?
resp = JOptionPane.showInputDialog("Enter the type of expense:");
type = resp;
resp = JOptionPane.showInputDialog("Enter the amount of the expense:");
amount = Double.parseDouble(resp);
[Code] .....
Sometimes a nullpointerexception is thrown, in some cases null is easily printed as a value of a variable without an exception being thrown.
View Replies View RelatedCode in the book is written exactly like this:
import java.util.Scanner;
public class AdditionQuiz {
public static void main (String[] args){
//Generate random two integers using utility System.currentTimeMillis
int n1 = (int)(System.currentTimeMillis() % 10);
int n2 = (int)(System.currentTimeMillis() / 7 % 10);
[Code] ....
however the true/false result can not be printed due to the "answer" variable...
I learning java an created the following servlet. The only problem is it printed to the browser as text instead of html..
It literally printed like this.
<html>
<HEAD><TITLE>Hellow World</TITLE></HEAD>
<body>
This STUFF IS WORKING!!!!!!!!!!!!!!!!!!
</body></html>
Why???
This is the servlet I created.
package sample;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet {
[Code] ....
how am i supposed to make line1B with "1f" and line2B with width of "10f"?
PHP Code:
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
[code]....
What is happening in below mentioned java code. Why in method insert, int l, int w is declaring & it is assigning to length & width.
class Rectangle{
int length;
int width;
void insert(int l,int w){
length=l;
width=w;
[Code] ....
I have a JXTable that is created like this:
JScrollPane scrollPane = new JScrollPane();
contentPanel.add(scrollPane, BorderLayout.CENTER);
tbl = new JXTable();
tbl.setColumnSelectionAllowed(true);
tbl.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
tbl.setEditable(false);
scrollPane.setViewportView(tbl);
The problem is that when it gets filled, all the columns are squashed together to fit into the jxtable. I expected the columns to be adjusted according to the width of the column header or column value (which ever is wider) and then for a horizontal scroll bar to be displayed that will enable me to scroll left or right.
I would like to bind the width of the second column of my TableView with the width of my TableView.
My custom TableView class :
public class CustomTableView<T> extends
TableView<ObservableList<Pair<String, Object>>> implements Cloneable {
private static Logger logger = Logger.getLogger(CustomTableView.class);
private double prefWidth; // optionnel private double minWidth; // optionnel
private double maxWidth; // optionnel private double height; // optionnel
private List<InfoColumnBean> cols; // optionnel
[Code]....
how to set the columnwidth in csv file using javacode.
I used FileWriter class to upload data into the csv file but csv file is taking default width while showing content. Is there a way to set the fixed column width or set width dinamically based on value?
Returning true from getScrollableTracksViewportWidth() makes the table (or other Scrollable) size its width to match the viewport. I need the opposite: for the viewport to expand its width to accommodate the table (of course, limited by the constraints imposed by the scroll pane's container's layout manager) without reducing column widths i.e. setAutoResizeMode(AUTO_RESIZE_OFF).
I have achieved this by overriding
getPreferredScrollableViewportSize(): JTable table = new JTable() {
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(super.getPreferredSize().width,
super.getPreferredScrollableViewportSize().height);
}
};
Now when the scroll pane is added at BorderLayout.CENTER and the frame is pack()ed, all columns of the table are displayed, without need for a horizontal scrollbar.
I was suppose to create a simple Java program for calculating the area of a rectangle (height * width). Then check the user’s input, and make sure that they enter in a positive integer, and letting them try again if they enter in a negative number. (I'm not sure how to get them to try again.
I am suppose to use an "if" statements and indeterminate loops to achieve the solution. The program will have the following requirements:
1. Ask the user to enter in both a height and width (as an integer)
2. If the user enters in a negative number, display an error
3. If the user enters in a negative number, give them another chance to enter in the correct value
4. Calculate the area and display to the screen once two positive integers have been entered.
import java.util.Scanner;
public class RectangleAreaCalc
{
public static void main(String[] args)
{
int length;
int width;
int area;
[Code] ....
Any way to get my Java window to open with a certain width and height. I've been googling and haven't found to much valuable information. Here is what I have so far.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class JavaWindow{
//Bring up the frame.
private JFrame f = new JFrame("JavaWindow");
[Code] ....
When you compile that it runs a small window. I would like that window to be bigger when the file opens.
I do not understand the getActionCommand and ActionListener concepts. This code does not resolve the volume for length, width, and height.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.awt.Container;
public class rectangularSolid extends JApplet implements ActionListener {
[Code] ....
I have a ComboBox -- just a simple ComboBox with string items.
My string items aren't very long (5 letters max), but the ComboBox shows quite wide relative to my strings. So I would like to size my ComboBox to the size of my strings.
I messed around with setting the CellFactory of the ComboBox, and have the Cells produced by the CellFactory set the preferred width of the cells to some constant like 100. That worked in terms of changing the size of the ComboBox to the preferred width of 100.
But what I really want to do is to compute the preferred width from the string items. For that I need to be able to compute how wide a string item will be when rendered. And I guess that depends on the font size used by the ComboBox to render strings, which probably depends on the platform (OS X different to Windows?).
I am developing a JavaFX application under Java 8 on my Ubuntu 14.04 (32 bit) system. When I run it on the Ubuntu box, all is fine, but when I run it under Windows 7 Home Premium (64 bit) with the same Java8 release installed, all my buttons have their text ellipsised (sp?). Why the behavior is different? Or is this a bug in JavaFX? Here are the particulars:
fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?><?import java.util.*?><?import javafx.geometry.*?><?import javafx.scene.*?><?import javafx.scene.control.*?><?import javafx.scene.layout.*?><?import javafx.scene.text.*?>
<AnchorPane id="AnchorPane" prefHeight="91.0" prefWidth="-1.0" xmlns:fx="http://javafx.com/fxml">
[Code] ....
Java:
java version "1.8.0_05"Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Server VM (build 25.5-b02, mixed mode)
public class MyInteger {
private int value;
public MyInteger(int number){
value = number;
System.out.println("Constructor created with value of " + value);
[code]....
I can't seem to get the value for integer1 and integer2 to pass with the setValue method. I get a runtime error stating the I need to have an int value for these two integers.
Create a program to input the length and width of a rectangle and calculate and print the perimeter and area of the rectangle. To do this you will need to write a Rectangle class and a separate runner class. Your program should include instance variables, constructors, an area method, a perimeter method, a toString method, accessor and mutator methods, and user input. Your runner class should include 3 Rectangle objects. One default rectangle, one coded rectangle, and one user input rectangle. All methods should be tested in the runner class.
This is my code:
import java.util.Scanner;
public class Rectangle {
double length;
double width;
public Rectangle() {
[Code] ...
What have I done??? I have created this program using the few different resources with which I am supplied, but I don't understand the resources.
I am trying to make a program so that the user has to enter a number for the width and length and it will give the area and perimeter:
import java.util.* ;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class jframe extends JFrame {
private static final int WIDTH = 400;
private static final int HEIGHT = 300;
[Code] ....
It is giving me an error saying that the ExitButtonHandler and ebHandler do not have classes but I don't understand why.