Wrong Version Appearing For Java Command
Sep 8, 2011
I am a novice to coding and very new to Java. It appears that I am having a similar problem as the user above "Scott Allen". With a few exceptions. My issue is that when I run the command "javac" from the command prompt I am receiving the same error:- "javac is not recognized as an internal or external command, operable program or batch file"
After reading the comments from above I have configured my System Variables "Path" and "JAVA_HOME" to match the following:
JAVA_HOME: C:Program FilesJavajdk1.6.0_21in
Path: %JAVA_HOME%in; [First Variable]
There is no "Path" User variable on my computer, although there is a "TEMP" and "TMP" in the User Environment variables.
Currently I have the following Java related software installed:
- C:Program FilesJavajre6
- C:Program FilesJavajdk1.6.0_21
- C:Program FilesSunJavaDB
- C:Program FilesEclipse-jee-galileo-3.5.2
I have confirmed the "javac.exe" is located within the in directory of Javajdk.1.6.0_21..When I send "Java -version" to the command prompt the following is returned: java version "1.6.0_26"..Immediately I noticed that the version is wrong, but don't know why or what to do. Below is the output from the command "Java" using the command prompt.
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.
[code]....
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Dec 1, 2014
I've Installed oracle JDK version 1.8 on a debian machine that already has openjdk 1.6.i've set the path variable in etc/login.defs and java_home variable In etc/environment. When I echo $JAVA_HOME it points to the oracle version correctly and when I run javac It uses the oracle 1.8 version. The problem is when I run the java command , It runs the openjdk 1.6 version and I'm not sure why.If I type java -version It shows the openjdk version.
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I am following a tutorial to write a 2d game from scratch in java but when I compile and run my code the application (JFrame) doesn't come up on my screen, it just runs for a second and terminates itself for some reason.
package com.thecherno.rain;
import java.awt.Canvas;
import java.awt.Dimension;
import javax.swing.JFrame;
public class Game extends Canvas implements Runnable{
private static final long serialVersionUID = 1L;
[code]....
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Jun 30, 2014
I have installed and tested j2se jdk8 u5 on my Windows 7 64 bit laptop and successfully tested in Eclipse with a quick Hello World.
JAVA_HOME = C:Program FilesJavajdk1.6.0_25
When I try to install j2ee jdk7 sdk7 I get
Error: Could not find the required version of the Java(TM) 2 Runtime Environment in '(null)'
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May 9, 2014
So all the errors in the code is fixed but its now got the wrong output
what I get:
Enter numerator; then denominator.
5
8
5/8
Enter numerator; then denominator.
4
10
4/10
Sum:0/0
it should be:
Enter numerator; then denominator.
5
8
5/8
Enter numerator; then denominator.
4
10
4/10
Sum: 82/80 1.025
Product: 20/80 0.25
Enter numerator; then denominator.
6 0
infinity
here is the code
Fraction.java
public class Fraction { //declares that it's a class that can be intantiated
private int numer; // private intager for numerator
private int denom; // private intager for denominator
[Code] ....
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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)
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So I have this class containing all my Enum types, also including methods for fetching Enum types based on their title attribute:
abstract class Enums {
static private Landmass getLandmass(String name) {
for ( Landmass l : Landmass.values( ) ) {
if(l.title.equals(name)){
return l;
[Code] .....
The second method (getAttribute) is created by copy-paste and I also need to repeat this exercise with several other types of Enums. This seems like a waste of code however.
Instead, I thought I'd create a generic method for fetching any type of Enums. As far as I could follow the tutorial @ Oracle I need a generic class for this. Thus the EnumHelper class:
abstract class EnumHelper<T> {
private T getEnum(T type, String name) {
for ( type t : type.values( ) ) {
if(t.title.equals(name)){
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}
This, however, doesn't compute:
horoscopeEnums.java:234: error: cannot find symbol
for ( type t : type.values( ) ) {
^
symbol: class type
location: class EnumHelper<T>
where T is a type-variable:
[Code] ....
2 errors
To be honest I haven't been able to make much sense of the documentation on generics, thus its no surprise I'm stuck.
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JButton bPlay, bStop;
AudioClip ac;
public SpelaLjud() {
bPlay = new JButton ("PLAY");
bStop = new JButton ("STOP");
add(bPlay);
add(bStop);
bPlay.addActionListener(this);
bStop.addActionListener(this);
[code]....
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Setting VM argument prism.verbose=true gives some insight of what happens.
There i see an old openGL version is used on OSX 10.9:
Graphics Vendor: ATI Technologies Inc.
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Version: 2.1 ATI-1.22.28
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package crossword;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
[code]....
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Here is the code:
the window opens, no errors, but the rectangle does not appear
Java Code:
import javax.swing.*;
import java.awt.Graphics;
public class myGame {
public int x = 20;
public int y = 20;
myGame(){
[Code] ....
I am using a text editor
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[Code] .....
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>How many integers do you want to generate?
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Here is my code for reference (it's not completed at the moment)
import java.util.Scanner;
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/** Main method
* @param args */
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int return_int;
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[Code] ....
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[Code].....
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