How To Write Import Statements And Use Its Class Components In One Line
Feb 5, 2015
I was wondering if I could write this code in one line.
import java.util.Scanner;
public class Test
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
char ch = sc.next().charAt(0);
}
}
Can I combine "import java.util.Scanner","Scanner sc = new Scanner(System.in);" and "char ch = sc.next().charAt(0);" in one statement? The object created from the class Scanner may be anonymous but it doesn't concern me!
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Mar 3, 2014
Im writing a simple program to understand classes and objects. Basically what I have is a file called Program.java where I have my main method.I have another file called Person.java which I want to use to create Person objects. That person can have a name, email adress, phone number, etc.I put both these files in the same folder.in Program.java my first statement is:
Java Code: import Person.java mh_sh_highlight_all('java');
My problem is that when I compile Program.java i get an error message saying that the package Person.java does not exist.So my question is, when you create a class that you want to use for objects, how do you import that class into your class with the main method so that you can use instances of your other class?
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Mar 5, 2014
i start work with TxT files. And i need know how to write text in the next line if file exist. My code just last text replace new.. Here code :
Main :
package YoYo;
import java.util.Scanner;
public class Main {
static String atsakymas;
static String FileName;
[code]....
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Jun 4, 2014
How to use a .class file I unpacked from a .jar file I downloaded from the Internet.
I downloaded the commons-io-2.4.jar file from commons . apache . org /proper/commons-io/
In it you can see that there is a class called FileUtil.class:
jar tf commons-io-2.4.jar | grep FileUtil
org/apache/commons/io/FileUtils.class
I extracted this with the following command:
jar xf commons-io-2.4.jar FileUtils.class
It is now in ..uk/ac/ebi/bioinvindex/services/datasearch/commons/FileUtils.class
Now, I have a java file where I would like to use FileUtils.
How do I do that? How do I import it?
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Mar 17, 2014
I have a question for the read and write method in file.In my code for writing i m using PrintWriter and for reading Scanner.So i m saving data to file and when is need it i m reading from the file.but i also have to delete specific data from it.Is there a way to delete a specific line from the file?When i google my problem i found that is better to save your data to temporary file and then to the final.
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Jul 22, 2007
I'm going to be taking an object oriented paradigm using java during intersession in a few months. I'm trying to brush up on it a bit. The problem is. Write an application that displays the numbers 1 to 4 on the same line, with each pair of adjacent numbers separated by one space. Write the program using the following techniques:Use one system.out.printLn statement.Use four system.out.print statement.Use one system.out.printf statement.
This is what i have so far .
Java Code: public class Display
{
public static void main(String [] args) {
System.out.print("1 ");
System.out.print("2 ");
System.out.print("3 ");
System.out.print("4 ");
System.out.println(" ");<----is that what that is supposed to look like, and where it goes?
System.out.printf(" %s %s %s %s ");????
}
} mh_sh_highlight_all('java');
i cant test this my console isn't working right, and i haven't finished my compiler install.
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Feb 17, 2014
I am puzzled by a note in the book I am reading (by Mala Gupta). Page 55 says "All java components you've heard of can be defined within a java class: import and package statements, variables.....". But the online oracle doc (tutorial) clearly says the following 2 statments:
"If present, package statement must be the very first line in a file"
"To import a specific member into the current file, put an import statement at the beginning of the file before any type definitions but after the package statement, if there is one. " (Here).
So, how can import and package be present inside a class ? (This seems to go against the 2 statements from oracle online tutorial).
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Jul 3, 2014
Write a program to reverse each word in line(sentence)?
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Apr 5, 2014
Usually, most of the time, I import the standard java stuff.But what happens when I find a code with a list of those com. imports:
import java.io.File;
import java.io.IOException;
import com.itseasy.rtf.RTFDocument;
import com.itseasy.rtf.text.Border;
import com.itseasy.rtf.text.Field;
Where are these imports and how do I "get" them?
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Jan 30, 2014
Write a class named Calculator add four methods to that class:
add(int a, int b)
sub(int a, int b)
mul(int a, int b)
div(int a, int b)
Then write a Tester class with main function and show the use of the methods in Calculator class..
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Nov 10, 2013
When I try to run Java from the Windows DOS command line, I'm running into trouble:
1. When I run Java from the wrong directory, I get the error Error: cannot find or load main class myapp1.
2. When I get to the "right" directory (.../MyApp1/build/classes/myapp1/, which is where the MyApp1.class file resides), I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: MyApp1 (wrong name: myapp1/MyApp1)
1. The CLASSPATH variable is not set (when I type echo %CLASSPATH% the system returns %CLASSPATH%).
2. I also get the same error above when I use: > java -cp . myapp1
3. I've made sure the PATH is set correctly in environment variables, with the Java path at the beginning of the path string).
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Jan 6, 2015
MyStack class have by default some fixed size of maximum elements, allow user of your class to specify in constructor what this maximum size is. Also add possibility to specify name of the stack in constructor. User can either create object without parameters, can specify only size or name, or both of them. And also override function toString(), that this code will print:
[stack1] 4 6 1
[stack2] empty
MyStack s1 = new MyStack("stack1");
MyStack s2 = new MyStack("stack2");
s1.push(4);
s1.push(6);
s1.push(1);
System.out.println(s1.toString());
System.out.println(s2.toString());
You will need in total 5 constractor: default constructor (new Stack())
1-parameter constructor precising maximum size of the stack (new Stack(10))
1-parameter constructor giving the stack name (new Stack("My Stack"))
2-parameter constructor giving the maximum size and the name of the stack (new Stack("My Stack", 10))
"copy" constructor (Stack s1=new Stack(); Stack s2=new Stack(s1);)
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Apr 13, 2015
I am to create a Array class then create a Driver class (TestArray) to test all the methods in the Array Class. Here's the code i've written for the Array Class. I just nee developing the TestArray class.
import java.util.Scanner;
public class Array
{
Scanner sc = new Scanner(System.in);
private double[] array = new double[];
public void setArray(double[] arr) {
[Code] ...
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Mar 19, 2014
Prompt: Write a class encapsulating the concept of a circle, assuming a circle has the following attributes: a Point representing the center of the circle, and the radius of the circle, and integer.
Include a constructor, the accessors and mutators, and methods toString and equals.
Also include methods returning the perimeter ( 2 x 𝜋 x 𝑟 ) and area ( 𝜋 x 𝑟^2) of the circle.
Write a client (application) class to test all the methods in your class. I started out trying to thing how to do this and I mapped out a certain idea but do not know how to incorporate the point represent the center of the circle. I am not sure how to proceed further..
import java.awt.*;
public class Circle {
public static void main(String[] args) {
final double PI = 3.14;
int x,y, radius = 4;
double area;
double perimeter;
[Code] ...
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Apr 26, 2015
I have an assignment to write a Payroll class that uses the following arrays as fields:
-employeeID - An array of seven integers to hold employee identification numbers. The array should be initialized with the following numbers: 5658845 4520125 7895122 8777541 8451277 1302850 7580489
-hours - An array of seven integers to hold the number of hours worked by each employee
-payRate - An array of seven doubles to hold each employees hourly pay rate
-wages - An array of seven doubles to hold each employees gross wages
The class should relate the data in each array through the subscripts. For example, the number in element 0 of the hours array should be the number of hours worked by the employee whose identification number is stored in element 0 of the employeeID array. That same employee's pay rate should be stored in element 0 of the payRate array. In addition to the appropriate accessor and mutator methods, the class should have a method that accepts an employee's identification number as an argument and returns the gross pay for that employee. Demonstrate the class in a complete program that displays each employee number and asks the user to enter that employee's hours and pay rate. It should then display each employee's identification number and gross wages. Input Validation: Do not accept negative values for hours or numbers less than 6.00 for pay rate.
I'm off to a great start, however I'm stumped on how to pass the payrate for each employee into the array, then grab that data in order to calculate the gross wage for each employee and store THAT in its own array. THEN I'll have to output that data to each employee.
Code is shown below.
import java.util.Scanner;
import java.text.DecimalFormat;
public class PayrollProgram {
public static void main(String[] args) {
Scanner userInput = new Scanner(System.in);
DecimalFormat df = new DecimalFormat("0.00");
[code]....
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Jan 20, 2014
Write a class encapsualting the concept of a course grade, assuming a course grade has the following attributes: a course name and a letter grade. Include a constructor, the accessor and mutator, and methods toString and equals.Write a client class to test all the methods in your class.
package labmodule7num57;
import java.util.*;
public class LabModule7Num57 {
// Constructors//
[code]....
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May 29, 2014
Write an instance method, contains, that has one explicit parameter of type Rectangle. The method should return true if every point of the rectangle determined by the explicit parameter is on or within the rectangle determined by the implicit parameter. It should return false otherwise.
This is what i did so far?
public boolean contains(Rectangle other) {
Rectangle intersect = Rectangle.intersection(this, other);
if ((intersect.left == this.left) && (intersect.bottom == this.bottom) && (intersect.width == this.width)
&& (intersect.height == this.height)) {
return true;
} else {
return false;
}
}
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Feb 10, 2015
There are two versions
1. The words remain in their places but the letters are reversed. Eg I love you becomes Ievol uoy
2. The words are also reversed. Eg I love you becomes uoy evol IWrite a program that use the java String class methods.
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Jun 19, 2014
Whenever I try to write a file to the disk and then load it within the same Class (if it is even possible) ...
It gives me an error: Could not find the main class: score.Score. Program will exit.
I have tried this with 2 different classes and it works fine? Why that error is appearing.
Code:
package score;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.Scanner;
public class Score {
public static void main(String [] args) throws Exception
[Code] .....
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Jun 21, 2013
Can we write java class or code inside Oracle Stored procedure.
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Feb 22, 2014
Here is what im trying to do
Write a class that accepts a user's hourly rate of pay and the number of hours worked. Display the user's gross pay (gross pay = hours worked * hourly rate), the tax withheld (tax withheld = gross pay * tax rate) and the net pay (net pay = gross pay - tax withheld).Use a named constant for storing the tax rate of 0.15
Here is my Code:
import java.util.Scanner;
class Tutorial
{
public static void main(String[] args);
[Code]....
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Nov 21, 2014
I have wrote this class who read from text line by line and save the words in fileOnTable.. Now i don't know what to read in ReadOffer to save the words in object offers and return this.. One more question.. What JUnit test can write for this code..?
package com.example.crazysellout.UserSide;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
[Code] ....
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May 5, 2014
My requirement is to find the line number using multiline string. Here I need to extract the string between FROM and where clause(from the below string) and need to find the line number in the file
SELECT HL.LOCATION_ID,HPS.PARTY_SITE_ID,HCAS.CUST_ACCT_SITE_ID
INTO LN_SITE_LOCATION_ID,LN_LOC_PARTY_SITE_ID,LN_CUST_ACCT_SITE_ID
FROM HZ_LOCATIONS HL,
HZ_PARTY_SITES HPS,
[Code]....
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Sep 10, 2014
Write a program that accepts the line number from the user and prints only that particular line from the Floyd triangle.
Example:
Input: 2
Output: 2 3
Input: 3
Output: 4 5 6
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Feb 18, 2015
How do I make the file reader object move to the next line if there is no more input on the line. Here is my text and output file as you can see that my text file column cuts off on the 2nd line after 70. I want to read that next line which is 100 into my labs variable however its reading it into my final exams variable. I'll also post the code but I didn't think it was necessary.
textfile:
100908095
1008070
10070
output:
Labs Projects Tests Final Exams
100908095
1008070100
70
[import java.util.Scanner;
import java.io.*;
public class MyGrades
{
public static void main (String[] args) throws IOException
{
int lab, project, test;
int finalExam;//Par and Player values
[Code]...
not sure if I code wrapped it correctly
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Oct 15, 2014
If I want to read my file line by line and when it hits a certain value from that point it should start deleting the lines until the tag ends.Just curious will my code actually work at the moment or not because it goes through so many times then goes straight back to the variable declarations at the start of the method and never hits the console print line.
public void removeEnvironment(){
//declare variable to environment id
String environmentID = "Environment id";
String lines = null;
boolean lineFound = false;
boolean end = false;
[code]...
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