Calculating Area Of A Rectangle (height Multiply By Width)
Mar 19, 2014
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] ....
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Feb 16, 2015
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.
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May 19, 2014
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.
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May 17, 2013
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] ....
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Jul 9, 2014
I have a requirement where in the content of the text area is dynamically populated from the database. I am able to successfully retrieve and display the data on the text area.
However when the content is too large, I am not able to dynamically set the height of the text area. When I try to display the same as a label, the display is flawless, dynamically sets the height as per the content. So, I tried to create a label, with same content and dynamically bind the height to the preferred height as below, but it doesn't work.
// Generate User Note Description
TextArea textArea = new TextArea();
Label text = new Label();
// SETTING THE TEXT TO A LABEL TO RETRIEVE THE HEIGHT
text.setText(usrNotes.getNote().trim());
[Code] ....
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Apr 27, 2014
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.
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Sep 9, 2014
I am supposed to be doing a class assignment that calculates the area of a triangle and outputs with JOptionPane. I was able to fix some errors, but it's uncovering more errors.Here is my code:
import javax.swing.JOptionPane;
import java.util.*;
import java.text.DecimalFormat;
import java.util.StringTokenizer;
public class Area {
public static void main (String [] args) {
double a, b, c; //Input sides of triangle
double x; //Perimeter of triangle
double area; //Area of triangle
StringTokenizer st;
[code]....
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Apr 21, 2014
Here is the code that I wrote out:
//program that calculates the circumference and area of a circle
import java.util.Scanner;
public class circle{
public static void main(String[] args){
Scanner input= new Scanner( System.in);
double r; //declares radius
[Code] .....
And here is what is displayed in the command prompt when I compile my code:
circle.java:17: error: cannot find symbol
r.input.nextdouble();//entered the radius
symbol: method nextdouble()
location: variable input of type Scanner
1 error
What am I doing wrong?
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Mar 22, 2015
I've been given a school assignment that reads, "Rewrite the main class Geometry so it takes in the dimensions for the triangle and ellipse as user inputs and create a Triangle and an Ellipse class. Use the appropriate variable types, constants, variable names and computational formulas.
Triangle class will have a computePerimeter and a computeArea methods Ellipse class will have a computeArea method Create Report class
• Create a method createReport that takes the values returned from Triangle and Ellipse and combines them in the following message and displays it. Format the values so that they have 2 decimals.
“The triangle has a perimeter of [perimeter] with an area of [area] while the ellipse has an area of [area]”
• Create a method switchReport that takes the original string from createReport and changes the message to display using the available methods in the String class
“The ellipse has an area of [area] while the triangle has an area of [area] with a perimeter of [perimeter]”"
I've run into a problem when creating the createReport method. Everytime i run it i get incorrect values for the perimeter and area (namely i get zero every time).
my code is as follows:
public class Triangle
{
public double base;
public double height;
public double hypotenuse;
private double tArea;
private double perimeter;
public Triangle()
{
base = 0;
height = 0;
hypotenuse = 0;
[code]....
For the triangle class and
public class Report {
Triangle tri2 = new Triangle();
Ellipse eli2 = new Ellipse();
public Report() {
}
public void createReport() {
System.out.println("The triangle has a perimeter of "+tri2.computePerimeter() +" with an area of " +tri2.computeTArea() +" while the ellipse has an area of " +eli2.computeEArea() );
}
for the report class.the Geometry class allows you to input values and if i skip the report and simply print the perimeter and area they are correct. However with the report class it simply gives me zeros.
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Jul 15, 2014
Here is the program I wrote for calculating the circumference of a circle.
//circumference.java
//program that calculates the area and circumference of a circle
import java.util.Scanner; //program uses class scanner
public class circumference{
//main method begins execution of Java application
public static void main(String args[]){
[Code] .....
Even though my code compiles and runs without any errors, the program doesn't calculate the circumference.
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Mar 3, 2015
package areatest;
import javax.swing.JOptionPane;
public class AreaTest {
public static double areaTriangle (double length, double width){ //How to calculate the area of a triangle
return .5f * length * width;
[Code] .....
When I try to get the area of a rectangle it gives me 9 no matter what input I give it. When I try to get the area of a triangle it gives me .5 no matter what input I give it. Same with the circle but it always gives me 12.56370...
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May 19, 2014
I started with finding the area of a triangle, but now I'm trying to ask a user what kind of shape they want the area for, then ask questions to get the area. I can't figure out how to take the shape a person types to go to a certain case. It also says shape hasn't been initialized. I don't know how to do that.
import java.util.Scanner;
public class TriangleArea {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args){
char shape;
String text = "Do you want to find the area of a triangle, square, rectangle, or trapezoid?";
System.out.print("Text");
switch(shape){
[code]....
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Jun 19, 2014
I am trying to create a program that will estimate a child height based on the height of the parents. It should ask the user to enter a String representing the gender, so m or M for a male and f or F for a female. The program must handle both upper or lower case gender entries. I need it to ask the user for the height of both parents in two parts:
1. for Feet and store in an int variable.
2. for inches and store and int variable.
So for example if the father is 6' 2'', the user would enter 6 when asked for feet and 2 when asked for inches. Convert the height of the each parent to inches. hint 12" in one foot.
Apply the following formulas based on gender (must use an if statement(s)):
Hmale_child = ((Hmother * 13/12) + Hfather)/2
Hfemale_child = ((Hfather * 13/12) + Hmother)/2
I cannot figure out what is missing from my code
<import java.util.Scanner;
public class ChildHeight
{
public static void main(String[] args) {
Scanner scannerObject = new Scanner(System.in);
String gender;
String male;
String female;
[Code] ....
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Mar 12, 2015
Develop a method that accepts as data input three integer numbers, calculates the sum and the product of the numbers, and displays the sum and product.
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Apr 14, 2014
I would like to multiply the amount stated inside program by user input. I currently have
public static void setTicket(double ticket)
{
//if statement for tickets
if (ticket == 1)
Ticket = 10.00;
else if (ticket == 2)
Ticket = 20.00;
else if ( ticket == 3)
Ticket = 30.00;
The user should enter 2 and the value should show 20.00. This does work however im looking for a way to say enter 2 = 2*10 instead of stating each value individually.
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Nov 2, 2014
My assignment is to write some code that will multiply every number in an array by 2 and print it out. This is using a site zyante which is a interactive online book kind of thing.
I have tried For (i=0; I < 8; i++) with like userVals = userVals * 2) }
And it doesn't like that so i'm guessing i am no where close to right. The chapter doesn't give me any example of doing anything close to this so i am completely lost on what i have to do.
This is the program :
import java.util.Scanner;
public class NegativeToZero {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
final int NUM_ELEMENTS = 8; // Number of elements
[Code] .....
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May 12, 2014
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int a = (int) 0.25;
int b = (int) 1.25;
int result = a + b;
System.out.println("Result of addition is "+ result);
}
}
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Jun 9, 2014
I am trying to make a program to multiplies two numbers without using the "*" operator. My idea was to add x number y amount of times, which is the same as multiplication. I did this with a for loop, but zero is always returned as the answer. How can I fix this?
public class secondMult {
public static void main(String[] args){
System.out.println(multWithSum(4,5));
}
public static int multWithSum(int x, int y){
int sum = 0;
for(int i = 0; i==y;i++){
sum = sum + x;
}
return sum;
}
}
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Sep 21, 2014
I have a program where the user enters in the miles and then it is supposed to get multiplied by feet but I keep getting this error.
GetUserInfo.java:12: error: bad operand types for binary operator '*'
int total = name * feet;
^
first type: String
second type: int
1 error
This is my code so far :
import java.util.Scanner;
public class GetUserInfo
{
public static void main(String[] args) {
String name;
int miles;
[Code] ....
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Nov 18, 2014
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]....
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Jul 24, 2014
I have a jTable with one or 40 rows in it.
The problem is, also when I have only one row in my jTable, the size of the jTable is a little more bigger than 40 rows.
How can I say the jTable, that she should scale to the size of the content?
I don`t want that the jTable is bigger than the content. For example the picture below:
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Mar 19, 2015
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] ....
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Jul 21, 2014
If I code:
int num0=0,num1=1,num999=999;
System.out print(num0+","+num1);
System.out println(","+num999);
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Jun 24, 2014
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
public class Racquet {
private static final int WIDTH = 60;
private static final int HEIGHT = 20;
[code]....
The problem arises at the portion of the code that says
private int Y = game.getHeight() - 70;
I am not actually getting any compiler errors, but when I try to run the program, the command prompt pops up with this message:
Exception in thread "main" java.lang.NullPointerException
at Racquet.<init>(Racquet.java:19)
at Game.<init>(Game.java:10)
at Game.main(game.java:58)
What I want to do is make it so a GUI object that I created moves with the screen when I change the height. If I change it to private int Y = 330; the program works just fine.
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Nov 12, 2014
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class AssortedAssortmentsOfSorts extends JFrame
[Code] .....
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Compute the height of a stack. Then determine whether that value is found in the stack element .
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