Compiler Does Not Show Any Warning Or Errors
May 18, 2014
public void init(Board board) {
JPanel Panel = new JPanel();
Panel.setLayout(new GridLayout(board.getWidth(), board.getHeight()));
getContentPane().add(Panel, BorderLayout.CENTER);
Panel.setBorder(new LineBorder(Color.BLACK)); // it does not work also
[code]....
I have a JFrame. I added two JPanels to the JFrame. The first one is GridLayout and it should be situated at CENTER. Another one is bottomPanel, and that one should be situated at SOUTH.I would like to add two new JPanels(kit and another one) to the bottomPanel.Compiler does not show any warning or errors.The problem is, that bottomPanel situates at NORTH, not at SOUTH. kit situates at CENTER of bottomPanel, not at WEST.
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Oct 19, 2014
A java program to print 10 random numbers between 512 and 1024 and then finds the smallest and biggest numbers from the list using only one loop
class BSLab4d {
public static void main (String[] args){
int[] nums = new int[10];
int largest = nums[0];
int x = 0;
int smallest = nums[0];
int y = 0;
[code]....
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Jun 5, 2014
I have a JSP which will let a user register for an account at my website. If the user submits wrong or illegal info into the JSP, then I want to return the same JSP with an appropriate error message next to/above each wrongly filled (form) fields.
If possible, highlight the wrongly filled form field - this feature is not necessary though.
I have given a sample below to show what I need. I understand that the sample must be using something like javascript, but I don't know all that client side scripting. I only want to use JSP to do it. As I said, I want to sort of return the JSP form to the user after marking all the mistakes and how to correct them.
How do I do this ?
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Mar 26, 2014
import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
/* display selected number
if selected, bg is green
if not selected bg is pink
*/
[code]....
my compiler is telling me that the getList... method is not being overridden.but when I change the JList<String> to JList and Object to String in the parameters, i get a warning from the compiler that it's an "unchecked call".
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Jan 3, 2015
What does this error mean, and also, when I get it, the command line hangs so that I can't do anything else (Is there a way to recover from that?). I'm running Windows 7.
Jan 03, 2015 5:00:59 AM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node SoftwareJavaSoftPrefs at root 0
x80000002. Windows RegCreateKeyEx(...) returned error code 5.
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Jun 12, 2014
When I run the following code from Java HeadFirst, everything goes fine but along with one error ( i don't know is it an error or exception, or some other windows stuff). The code is
import javax.sound.midi.*;
class ExceptionHandling {
public static void main(String[] args){
ExceptionHandling o = new ExceptionHandling();
o.play();
[Code] ....
And what I got on cmd ( I am using Windows 7) :
Jaspreet javac ExceptionHandling.java
Jaspreet java ExceptionHandling
Jun 11, 2014 5:19:40 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node SoftwareJavaSoftPrefs at root 0
x80000002. Windows RegCreateKeyEx(...) returned error code 5.
We got the sequencer
What is meant by code in blue? I know its some message from windows os and not from jvm. but i didn't understand it.
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Mar 26, 2015
There are 2 methods and a main one. The first is a void that creates a 3x4 2d array and the second is to search for a value in the array, if found it will return the number of the row that contains that value. If not, it will return -1, but I am getting 1 error and 1 dead code warning.I will put comments at the lines that contain the problems
import java.util.Scanner;
class Question4{
public static void main(String[]args){
Scanner s = new Scanner(System.in);
int x,n;
System.out.println("Please input the value that will be used in the array");
x=s.nextInt();
System.out.println("What is the value you want to search for?");
n=s.nextInt();
createArray (x,n);
[code]....
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Sep 2, 2014
I'll start off by showing my full code:
Main class
import javax.swing.JFrame;
public class groupingTest {
public static void main (String[] args) {
groupWindow test = new groupWindow();
[Code]....
At the start of the groupWindow it turns yellow and it says "The serializable class groupWindow does not declare a static final serialVersionUID field of type long".
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Jun 23, 2015
This the output of java from my PC under linux platform (rhel 6.5).
[pentaho@vertica-srv1 Downloads]$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
[Code] ....
But the problem is while trying to open ETL program under linux platform [pentaho@vertica-srv1 data-integration]$ ./spoon.sh .... I received the following error messages.
[pentaho@vertica-srv1 data-integration]$ ./spoon.sh
Trying to add database driver (JDBC): RmiJdbc.RJDriver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): jdbc.idbDriver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): org.gjt.mm.mysql.Driver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): com.mckoi.JDBCDriver - Warning, not in CLASSPATH?
[KnowledgeFlow] Loading properties and plugins...
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Apr 30, 2015
I have the following code.
class A {
List<StringBuilder> list;
public void output(List<StringBuilder> objectToOutput){
try(BufferedWriter bw = new BufferedWriter(new FileWriter("temp.txt"))){
for(StringBuilder row:objectToOutput) bw.write(row.toString());
}catch(IOException e){}
[code]....
Why don't the a's show up on the console? I put them in as part of the debugging process and now I don't understand why they don't show up in both places.
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Oct 26, 2014
I am getting notification about "The value of the local variable result not used" in my program when i am using boolean data type.But code execution was successful. Results are also displayed accurately.I am using Eclipse, there i i have noticed this warning.
* program to practice about comparison operators */
public class compoperators {
public static void main(String[] args) {
boolean result;
}
[code]....
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Feb 26, 2014
I have a question: I have a Java/JSP/JavaScript project that access back end Oracle database, and provide interaction through tomcat. After we deployed our project, I found one button does not generate necessary warning message from server, but when I deployed and tested our project on local PC, it does generate correct warning message. I am using the same IE, same tomcat version, and I am sure my container is pointing to the same database, and I am sure I using same version of project code by checking with GIT.
Here is the button that I click:
<a target="frmMain" href="RealignServlet?button=REALIGNMENT" title="Procedure Alignment">Align</a><br>
And here is part of the code of RealignServlet:
public class RealignServlet extends SiapBaseServlet {
private static final long serialVersionUID = 1L;
private static final Logger logger = AppLogger.getLogger(RealignServlet.class.getName());
private static final String PROC_QUERY_JSP = "ProcQuery.jsp";
private static final String REALIGN = "REALIGNMENT";
[Code] .....
Our problem is server could not generate alignMsg. But we can get it on local deployed project.
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Aug 13, 2014
I am reading a java book and find a theory about Interpreter and Compiler. explain different between them?
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Apr 3, 2014
An example from the SCJP(OCP) book:
Java Code:
class Animal {
void makeNoise() {System.out.println("generic noise"); }
}
class Dog extends Animal {
void makeNoise() {System.out.println("bark"); }
void playDead() { System.out.println("roll over"); }
[Code] .....
The book states that the above code will compile if there is a downcast in the line 14 . But there is a compiler error saying playDead method is not defined for type animal even after downcasting.
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Aug 20, 2014
Running a java source code through an online java compiler (in which you will just pass the the source code using a http request, then the compiler will return the output/error of the source code automatically)?.
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Oct 19, 2014
I am working in software testing, specifically automatic test cases generation. Among the existing forms of test cases, my focus is on the test cases that are composed of sequences of events such as _.event1.event2 eventx()
However, the events can be classified into: sensitive and insensitive. The latter does not affect the system's states, and hence, it can be ignored; while the former affects the states. Anyhow, the sensitive events in the test cases may lead to states explosion and there is a need to prevent that. Therefore, some techniques suggest using one variable to present states and group all similar states together such as using len variable in circular queue. Relatively, the states can be represented by using specific drawings such FSM.
For example, the test cases for circular queue may look like:
add(0).remove().add(1).Front()
add(0).add(1).remove().Front()
which produce the following states:
len=1, rear=0, front=0 and dataQ[0]=0
len=0, rear=0, front=1 and dataQ={0}
len=1, rear=1, front=1 and dataQ[1]=1
len=1, rear=0, front=0 and dataQ[0]=0
len=2, rear=1, front=0 and dataQ[1]=1
len=1, rear=1, front=1 and dataQ={1,0}
As can be seen, every addition/deletion produces a new state. A state is composed of 4 variables: len, rear, front and dataQ. The 1st three variables are integers while the dataQ is an integer array. Nonetheless, the states produced by different test cases can be identical which wastes effort and time. So, there is a need to optimize these states. The search techniques were suggested where the problem can be represented as a search problem and the technique is applied. If we consider Len as a state, then we will have: len=0; 0QSize. However, this does not represent the state but it suits for classifying the states into groups.
In terms of states representation, State Machine/Map Compiler (SMC) was suggested as a modeling mechanism that takes the state machines (i.e. FSM) drawing and generates the code in any preferred language. In SMC, the FSM is represented in a specific syntax (state---transition----next state) and saved in a file (.sm). This file will be compiled by SMC to generate a context class which includes definitions of states, transitions and actions in FSM but still need to be triggered by another class. This class has to call the transitions that modifies the state.
We had created that class and implemented all the methods with their transitions. However, the FSM used was based on 1 variable only (i.e. len). Besides, we are still looking for the SMC results as they will be the input for any search technique to be applied. Supposedly, the states generated by SMC can be used directly in the search technique but this is still questionable.
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Apr 24, 2015
I have started to learn JAVA and was referring Head First JAVA book.
I have 3 separate .java files - GuessGame.java , Player.java, GameLauncher.java
I have successfully compiled GuessGame.java & Player.java
But I am getting an error when I am compiling GameLauncher.java.
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Feb 20, 2014
I remember reading Instance variables & local variables (in methods) are initialized to appropriate value by the compiler.
Is this true for static class variables and variables in nested classes ?
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Feb 20, 2014
public class Main {
private static void foo(Integer a) {
System.out.println("Integer");
}
private static void foo(long a) {
System.out.println("long");
[Code] ....
This code prints long. Why is that? How did compiler decided that it likes long version of foo() method the most. If I had to guess I'd pick int... or possibly Integer as they are most similiar to what was passed. But why long?
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Oct 24, 2014
I'm a beginner fiddling around classes in Java. I noticed on this particular code, Eclipse will give me an error and suggest I put the static keyword in front of the variable.
public class test {
//the following line is where Eclipse puts the static keyword
static FileAccess hello = new FileAccess("D:" + '\', ".mp3");
public static void main(String[] args) {
for (int i = 0; i < hello.getTotalNumberOfFiles(); i++) {
[Code] .....
The FileAccess class is just a class I made while trying to retrieve filenames from my hard drive.
As far as I can tell, it works correctly after I put the static keyword there. I just want to know why it is required in this particular code, considering it didn't need to do that when I made a simpler class while I was getting my feet wet at creating classes in Java.
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Sep 6, 2014
I was trying to execute the following codes, but the something that I don't undestand was happen. The program was compiled differently according to ouput picture of the program in my java book. Furthermore, then I tried to compile the program in eclipse and NetBeans. I saw that all of output are different each other.
package finallyblock;
public class FinallyBlock {
public static void main(String[] args) {
try{
throwException();
}
catch(Exception exception){
System.err.println("Exception handled in main");
[code]...
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Nov 13, 2014
Is there any way to compile a program without calling constructor.
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Apr 21, 2015
I am trying to make lexical phase of compiler. But when I try to add character (after validating them, whether they are character or not) to token array I cannot do it.
public class Main {
static int counter;
static char ch[];
static char c;
static char token[];
static String read;
[Code] .....
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Feb 16, 2015
My objective here is to process a HashMap's key's in order. I found SortedSet as a way to do it.
The HashMap is like this:
nobelPrizeWinners = new HashMap<String, PrizeWinner[]>();
// 2009:
nobelPrizeWinners.put(new String ("2009 Physics"), new PrizeWinner[] {new PrizeWinner("Charles K.", "Kao"), new PrizeWinner("Willard S.", "Boyle"), new PrizeWinner("George S.", "Smith")});
[Code] ....
This is the method I am trying to write
public void displayAllYearsAndWinners_2()
{
// Creation of the SortedSet
SortedSet sortedSet = new TreeSet();
[Code] ....
However, the compiler gives me a warning of NobelPrizeWinners.java uses unchecked or unsafe operations. Recompile with -Xlint:unchecked for details.
As I said, my objective here is to process them in order. If this compiler warning cannot be resolved, I am open to other methods of accomplishing my objective.
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Sep 28, 2014
I need to do a simulation on the assembly code level by writing a mini-compiler for each ISA, i.e., 4, 3, 2-Address Architecture, Accumulator Architecture, Stack Architecture, and Load-Store Architecture.The input to the simulator is a segment of C program:The basic sample segments of C code are:
1. A = (B + C) * D - E;
2. F = (G + H) - (I + J);
3. G = H + A[I];
4. If (I == J) F = G + H;
Else F = G - H;
5. Loop: G = G + A[I];
I = I + J;
If (I != H) Goto Loop;
6. If (G < H) Goto Less;
7. While (save[I] == K)
I = I + J;
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Sep 14, 2014
So I'm trying to implement a quick sort method for an ArrayList of Strings and right now I'm getting the compiler error message: Exception in thread "main" java.lang.OutOfMemoryError: Java heap space. I don't know what that error means nor how to fix it. I've marked in my code where the error seems to be occurring.
import java.util.ArrayList;
public class quickSort
{
// constructor
public quickSort()
[code]....
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