Main Method issues
import java.util.Scanner;
public class Orbit
public static void main(String[] args)
int n;
Scanner keyboard = new Scanner(System.in);
System.out.print("Enter Number: ");
n = keyboard.nextInt();
double sum = 0.0;
for (int i = 1; i <= n; i++)
sum += 1.0/i;
System.out.println("Harmonic number: " + sum);
}So this code works, if you input 6 you get out the harmonic 2.449999997
import java.util.Scanner;
public class Orbit
public static void main(String[] args)
int n;
Scanner keyboard = new Scanner(System.in);
System.out.print("Enter Number: ");
n = keyboard.nextInt();
int x = n;
for(int i = 1 ; i <= 10; i++)
if(isPali(x))
System.out.println("Palindrome number: " + x);
break;
StringBuffer sb = new StringBuffer(x + "");
StringBuffer sb2 = sb.reverse();
String s3 = sb2.toString();
int x2 = Integer.parseInt(s3);
x += x2;
public static boolean isPali(int l)
String longAsString = l + "";
int x = longAsString.length();
if (x == 1)
return true;
if(x == 2)
char x1 = longAsString.charAt(0);
char x2 = longAsString.charAt(1);
return x1 == x2;
if( (x % 2) == 1)
StringBuffer newString = new StringBuffer();
int xx = x;
int y = (xx / 2);
newString.append(longAsString.substring(0, y));
newString.append(longAsString.substring(y + 1));
String ss = newString.toString();
int xxx = ss.length();
for(int i = 0; i < xxx/2; i++)
char xFirst = ss.charAt(i);
char xLast = ss.charAt(xxx - (i + 1));
if(xFirst != xLast)
return false;
return true;
if( (x % 2) == 0)
int xx = longAsString.length();
for(int i = 0; i < xx/2; i++)
char xFirst = longAsString.charAt(i);
char xLast = longAsString.charAt(xx - (i + 1));
if(xFirst != xLast)
return false;
return true;
return false;
}And then this code works to output any given number's palindrome, but when I attempt to add the first one onto the end of the second one, i get an error stating that the variable 'n' is not defined as is per this code
import java.util.Scanner;
public class Orbit
public static void main(String[] args)
int n;
Scanner keyboard = new Scanner(System.in);
System.out.print("Enter Number: ");
n = keyboard.nextInt();
int x = n;
for(int i = 1 ; i <= 10; i++)
if(isPali(x))
System.out.println("Palindrome number: " + x);
break;
StringBuffer sb = new StringBuffer(x + "");
StringBuffer sb2 = sb.reverse();
String s3 = sb2.toString();
int x2 = Integer.parseInt(s3);
x += x2;
public static boolean isPali(int l)
String longAsString = l + "";
int x = longAsString.length();
if (x == 1)
return true;
if(x == 2)
char x1 = longAsString.charAt(0);
char x2 = longAsString.charAt(1);
return x1 == x2;
if( (x % 2) == 1)
StringBuffer newString = new StringBuffer();
int xx = x;
int y = (xx / 2);
newString.append(longAsString.substring(0, y));
newString.append(longAsString.substring(y + 1));
String ss = newString.toString();
int xxx = ss.length();
for(int i = 0; i < xxx/2; i++)
char xFirst = ss.charAt(i);
char xLast = ss.charAt(xxx - (i + 1));
if(xFirst != xLast)
return false;
return true;
if( (x % 2) == 0)
int xx = longAsString.length();
for(int i = 0; i < xx/2; i++)
char xFirst = longAsString.charAt(i);
char xLast = longAsString.charAt(xx - (i + 1));
if(xFirst != xLast)
return false;
return true;
return false;
double sum = 0.0;
for (int i = 1; i <= n; i++)
sum += 1.0/i;
System.out.println("Harmonic number: " + sum);
}Now the sad thing is I know exactly why this is happening, because the variable n is in the main method but the main method was forced to close to make room for the Boolean isPali, and it would make sense to place the Harmonic code in the main method but the output required for this is such that the harmonic needs to be after the Palindrome - I am currently asking for that to be changed but that never works. Now of course also I could prompt the user again but that is a little tacky and frowned upon.
~Thanks
Ok, sorry let me clarify it a little bit.
I define n as the user input variable. How I have the code set up currently is to create the palindrome of that number using a boolean expression. I have it set up currently to exit the main method and enter into the boolean expression because it seems to be the only way I can complete that part of code. Now as for my problem, with "int n" being defined in the main method, I can not access it without being in that main method.
Orbit.java:138 cannot find symbol
symbol : variable n
location: class Orbit
for (int i = 1; 1 <= n; i++)
*as you would imagine, the '^' is under the sole n in the line of code
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Does not contain a static 'Main' method suitable for an entry point_
Hello
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Please refer the following URL.
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Java Home = C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51\java\jre
ws.ext.dirs = C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/java/lib;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/classes;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/classes;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib/ext;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/web/help;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/deploytool/itp/plugins/com.ibm.etools.ejbdeploy/runtime;C:/Program Files/IBM/SQLLIB/java/db2java.zip;C:/Program Files/IBM/WebSphere Studio/Application Developer/v5.1.2/wstools/eclipse/plugins/com.ibm.etools.webservice_5.1.2/runtime/worf.jar
Classpath = C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/properties;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/properties;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib/bootstrap.jar;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib/j2ee.jar;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib/lmproxy.jar;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/lib/urlprotocols.jar;C:\WebSphere\properties;C:\spi4j2.5.4_J2ee1.4\clientLib\XEES.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\bcprov-jdk14-139.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\config.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\spi4jStub_2.5.4.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\XEES100J.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\XEES110J.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\XEES120J.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\XEES200J.jar;C:\spi4j2.5.4_J2ee1.4\clientLib\XTCP211.jar;C:\spi4j2.5.4_J2ee1.4\Demo\log4j-1.2.8.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\spi4jCore_2.5.4.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\axis-1.1.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\xmlParserAPIs-2_2_1.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\jaxrpc.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\wsdl4j.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\fsgWsif1.1.jar;C:\spi4j2.5.4_J2ee1.4\Demo\commons-logging.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\tools.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\commons-pool-1.2.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\saaj.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\commons-beanutils-core.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\commons-collections-3.1.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\commons-discovery.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\commons-lang-2.1.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\connector.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\FEDRWSCHECKSTATUSAxisInfo.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\fscontext.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\IFSClassLoader1.2.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\j2ee1.4.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\jca.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\jta.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\mail.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\providerutil.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\qname.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\soaprmi-1_1.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\xalan.jar;C:\spi4j2.5.4_J2ee1.4\coreLib\xercesImpl-2_2_1.jar;C:/Program Files/IBM/WebSphere Studio/Application Developer/v5.1.2/wstools/eclipse/plugins/com.ibm.etools.websphere.tools.common_5.1.1.1/runtime/wteServers.jar;C:/Program Files/IBM/WebSphere Studio/Application Developer/v5.1.2/wstools/eclipse/plugins/com.ibm.etools.websphere.tools.common_5.1.1.1/runtime/wasToolsCommon.jar
Java Library path = C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/bin;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/java/bin;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\runtimes\base_v51/java/jre/bin;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\eclipse\jre\bin;.;C:\Program Files\IBM\WebSphere Studio\Application Developer\v5.1.2\eclipse\jre\bin;C:\oracle\product\10.2.0\client_2\bin;C:\oracle\product\10.2.0\client_1\bin;Y:\oracle\ora92\BIN;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\PROGRA~1\CA\SHARED~1\SCANEN~1;C:\PROGRA~1\CA\ETRUST~1;C:\PROGRA~1\IBM\SQLLIB\BIN;C:\PROGRA~1\IBM\SQLLIB\FUNCTION;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;C:\Program Files\Rational\common;C:\Program Files\Rational\ClearCase\bin;C:\Program Files\IBM\SDP70\jdk\bin
************* End Display Current Environment ************* -
Object life in main method after frame created
hi
i'm having a slight problem with the life of an object i'm creating in the main method of my application.
i have a JDesktopPane that is initialised in the main class's main method and constructor. within the main method i also add the first internal frame to the desktop.
after the user completes the details of the first frame, another is called (from this first frame) and the first frame is disposed.
the problem is that although all subsequent internal frames added to the desktop outside the main class, they are garbage collected with no problems (i'm using a profiler), however the first frame and the frame created from that first frame are never collected due to the reference maintained in the main class. i've tried adding the creation of these frames outside the main class but given that these methods are called from main the reference is still maintained.
is there any way to create those first 2 frames without the reference being maintained in the main class such that they become elegible for garbage collection? do i have it all wrong perhaps and my approach is bad?? any help would be greatly appreciated.
thanks heaps.
Takishi
thanks for your reply.
i tried that and it didn't work. the instance of that first internal frame is still there.
i really am at a loss with this one.
any other suggestions would be greatly appreciated.
Takis -
Need help - how to run this particular method in the main method?
Hi all,
I have a problem with methods that involves objects such as:
public static Animal get(String choice) { ... } How do we return the "Animal" type object? I understand codes that return an int or a String but when it comes to objects, I'm totally lost.
For example this code:
import java.util.Scanner;
interface Animal {
void soundOff();
class Elephant implements Animal {
public void soundOff() {
System.out.println("Trumpet");
class Lion implements Animal {
public void soundOff() {
System.out.println("Roar");
class TestAnimal {
public static void main(String[] args) {
TestAnimal ta = new TestAnimal();
ta.get(); // error
// doing Animal a = new Animal() is horrible... :(
public static Animal get(String choice) {
Scanner myScanner = new Scanner(System.in);
choice = myScanner.nextLine();
if (choice.equalsIgnoreCase("meat eater")) {
return new Lion();
} else {
return new Elephant();
}Out of desperation, I tried "Animal a = new Animal() ", and it was disastrous because an interface cannot be instantiated. :-S And I have no idea what else to put in my main method to get the code running. Need some help please.
Thank you.Hi paulcw,
Thank you. I've modified my code but it still doesn't print "roar" or "trumpet". When it returns a Lion or an Elephant, wouldn't the soundOff() method get printed too?
refactored:
import java.util.Scanner;
interface Animal {
void soundOff();
class Elephant implements Animal {
public void soundOff() {
System.out.println("Trumpet");
class Lion implements Animal {
public void soundOff() {
System.out.println("Roar");
class TestAnimal {
public static void main(String[] args) {
Animal a = get();
public static Animal get() {
Scanner myScanner = new Scanner(System.in);
System.out.println("Meat eater or not?");
String choice = myScanner.nextLine();
if (choice.equalsIgnoreCase("meat eater")) {
return new Lion();
} else {
return new Elephant();
}The soundOff() method should override the soundOff(); method in the interface, right? So I'm thinking, it should print either "roar" or "trumpet" but it doesn't. hmm.. -
How can i call a main method from a different class???
Plzz help...
i have 2 classes.., T1 and T2.. Tt2 is a class with a main method....i want to call the main method in T2......fromT1..is it possibl..plz helpT2.main(args);
-
How to add a code TestIfElse(10) to the Main method of the Program.cs class?
How to add a code TestIfElse(10) to the Main method of the Program.cs class?
Here is my code and I have copied from the Wiley book for Microsoft certification page 14,
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ifelse_Statement
class Program
static void Main(string[] args);
TestIfElse(10);
public static void TestIfElse(int n);
if(n < 10)
Console.WriteLine("n is less than 10");
else if(n < 20)
Console.WriteLine("n is less than 20");
else if(n < 30)
Console. WriteLine("n is greater than or equal to 30");
Here is the error list I am getting,
Error 1 Method must have a return type C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\switch_Statement\Program.cs
12 13
switch_Statement
Error 2
Type expected C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\switch_Statement\Program.cs
12 24
switch_Statement
Error 3
Method must have a return type C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
12 9
ifelse_Statement
Error 4
Type expected C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
12 20
ifelse_Statement
Error 5
Invalid token 'if' in class, struct, or interface member declaration
C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
16 9
ifelse_Statement
Error 6
Invalid token '10' in class, struct, or interface member declaration
C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
16 16
ifelse_Statement
Error 7
Type expected C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
16 16
ifelse_Statement
Error 8
Invalid token '(' in class, struct, or interface member declaration
C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
18 35
ifelse_Statement
Error 9
A namespace cannot directly contain members such as fields or methods
C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
20 10
ifelse_Statement
Error 10
Type or namespace definition, or end-of-file expected
C:\Users\PVS\documents\visual studio 2013\Projects\Lesson01\ifelse_Statement\Program.cs
30 1
ifelse_Statement
Error 11
The type or namespace name 'n' could not be found (are you missing a using directive or an assembly reference?)
c:\users\pvs\documents\visual studio 2013\projects\lesson01\ifelse_statement\program.cs
16 12
ifelse_Statement
Error 12
'System.Console.WriteLine(string, params object[])' is a 'method' but is used like a 'type'
c:\users\pvs\documents\visual studio 2013\projects\lesson01\ifelse_statement\program.cs
18 26
ifelse_Statementstatic void Main(string[] args){
TestIfElse(10);
public static void TestIfElse(int n)
if (n < 10)
Console.WriteLine("n is less than 10");
else if (n < 20)
Console.WriteLine("n is less than 20");
else if (n < 30)
Console.WriteLine("n is greater than or equal to 30");
Fouad Roumieh -
Class extending a Frame with main method in it - how do I use the methods?
Howdy.
Having a problem.. I want my "main" class, ie. the class with the main method in it to extend a Frame class.. because the main method is static, I can't use Frame's methods.
What's a trick to get around this ? I am making a deliberate design decision to extend the Frame class, because I thought it was.. well.. better. I could always just create a Frame object and utilise it.. but from little things I've read and seen it's better to extend it.
When I use Forte to make a Frame program it sets up a constructor/etc. for the main class and then it does something akin to this (the class is called MazeGenerator) :
public static void main(String args[]) {
new MazeGenerator().show();
What does "new MazeGenerator().show();" do when it's not being associated to an object handle ??
Ta.
- Scutt.Create an instance of the frame in main then the constructor can control it. Or you could add an init method or something:
class MyFrame extends Frame {
public static void main (String [] args) {
MyFrame frame = new MyFrame();
frame.init();
You don't necessarily have to have a reference to an Object in order to create one. All the work can be done in the constructor (something I'm not really fond of however) -
Calling main method in another class using command line arguements
Hi
My program need to use 4 strings command line arguments
entered in Project properties/Run/Application Parameters
java programming for beginners // arguments
The program needs to call main in the second class 4 times using argument 1 the first call, argument 2 the second call on so on.
So the output wil be
java
programming
for
beginners
import java.lang.*;
public class First extends Second{
public static void main(String[] args) {
for(int i = 0; i < args.length; i++){
Second.main(args); // Error I think
import java.lang.*;
public class Second {
public static void main(String[] args){
System.out.println(args[0]);
"First.java": Error #: 300 : method main(java.lang.String) not found in class Second at line 6, column 15
I am only a beginner with little knowledge of java so can the code be as basic as possibleYour style looks quite bad for starters..... Hows
this://import java.lang.*; /* NOT NEEDED */
public class First extends Second{
public First(String s) {
super(s);
public static void main(String[] args) {
for(int i = 0; i < args.length; i++){
new First(s);
public class Second {
public Second(String s)
System.out.println(s);
NOT NEEDED:
public static void main(String[] args){
System.out.println(args[0]);
}My question to you: Do you understand why my code
works? (does it do what you want?)I think since this is some kind of lesson, the OP have to implement some way to use the main method of the Second class as it is, that is, with String[] args. I think this lesson is interesting exactly because of this requirenment. But, anyway, I don�t know, that is just my assumption... -
Projectname.exe' does not contain a static 'Main' method suitable for an entry point .
Hi,
I'm developing a blog reader for windows 8 store app. It was perfectly worked before. But because of some miss behave my coding i get below error. No other errors there.
Error 1 Program 'c:\Users\.........\Desktop\Blog_Reader\Blog_Reader\obj\Release\intermediatexaml\Blog_Reader.exe' does not contain a static 'Main' method suitable for an entry point C:\Users\..........\Desktop\Blog_Reader\Blog_Reader\CSC
Blog_Reader
Please help me to figure this.
Thank You!Go to your App.Xaml and R-Click Go to Properties
Check whether the Build Action is ApplicationDefinition
If not change it to ApplicationDefinition. Clean the code (solution ) and Deploy..
Chears.... -
Running a java application without a main method
class MainMethodNot
static
System.out.println("This java program have run without the run method");
System.exit(0);
}The reason this works is that static initialization blocks get executed as soon as the class is loaded, even before the main method is called. During run time JVM will search for the main method after exiting from this block. If it does not find the main method, it throws an exception. To avoid the exception System.exit(0); statement is used which terminates the program at the end of the static block itself.
got it from http://www.java-tips.org/This has been published many times on this forum. What is your question?
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