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Thread: does not mesh with two-eimensional array

  1. #1
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    Default does not mesh with two-eimensional array

    import java.util.*;
    import javax.swing.*;
    public class Schedule
    {
    	public static void main(String[] args)
    	{
     
     
    		String[] classSchedule =  {"CIS 110", "ENG 111", "MAT 070","WEB 110"}; 
    		String myClass;
    		int x;
    		boolean classExists = false;
    		myClass = JOptionPane.showInputDialog(null, "Enter a class");
    		for(x = 0; x < classSchedule.length; ++x)
    			if(myClass.equals(classSchedule[x]))
    				classExists = true;
    			if(classExists)
    				JOptionPane.showMessageDialog(null, myClass +
    					" exists");
    			else
    				JOptionPane.showMessageDialog(null, myClass +
    					" does not exist");
     
    }
    }


    basically I take this code here, try to implement a second dimension in the array, and suddenly none of the classes esist
    Last edited by helloworld922; December 7th, 2010 at 07:38 PM.


  2. #2
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    Default Re: does not mesh with two-eimensional array

    Wait....I see now.

    Your for loop only deals with the if statement after it. It doesn't bother with anything else.

    You need brackets around the parts in the for loop.

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    Default Re: does not mesh with two-eimensional array

    Also, if that's not what it is, try changing the
    ++x to an x++ to see if that works.

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    Default Re: does not mesh with two-eimensional array

    I tried this, and it tells me it doesnt exist. and it tells me 8 times
    import java.util.*;
    import javax.swing.*;
    public class test5
    {
    	public static void main(String[] args)
    	{
     
     
    		String[][] classSchedule = { {"CIS 110 ", "ENG 111 ", "MAT 070 ","WEB 110 "},
    				             {"Wen 4:40 ", "Tue 5:40 ", "Mon 1:25 ", "Sat 1:00 "}}; 
    		String myClass;
    		int x;
    		int y;
    		boolean classExists = false;
    		myClass = JOptionPane.showInputDialog(null, "Enter a class");
    		for(x = 0; x < classSchedule.length; ++x)
    		{
    			for(y = 0; y < classSchedule[x].length; ++y)
    			{
    			if(myClass.equals(classSchedule[x]))
    				classExists = true;
    			if(classExists)
    				JOptionPane.showMessageDialog(null, myClass +
    					" exists");
    			else
    				JOptionPane.showMessageDialog(null, myClass +
    					" does not exist");
    				}
    		}
    }
    }
    Last edited by helloworld922; December 7th, 2010 at 07:38 PM.

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    Default Re: does not mesh with two-eimensional array

    Looks like it's working to me.

    What's the problem?

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    Default Re: does not mesh with two-eimensional array

    String[][] classSchedule = { {"CIS 110 ", "ENG 111 ", "MAT 070 ","WEB 110 "},
    {"Wen 4:40 ", "Tue 5:40 ", "Mon 1:25 ", "Sat 1:00 "}};

    What happens if you change the above to

    String[][] classSchedule = { {"CIS 110 ", "ENG 111 ", "MAT 070 ","WEB 110 ",
    "Wen 4:40 ", "Tue 5:40 ", "Mon 1:25 ", "Sat 1:00 "}};

  7. #7
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    Default Re: does not mesh with two-eimensional array

    when I run the first code I have posted, it tells me if the class exists or not.

    when i run the second one, no matter what I have typed, it says it doesnt exist and repeats itself 8 times

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    Default Re: does not mesh with two-eimensional array

    First of all, it'd be

    if (myClass.equals(classSchedule[x][y])
    as it's 2D

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    Default Re: does not mesh with two-eimensional array

    I still am baffled as to why it's not working, but I've gotten it to only show it once.
    import java.util.*;
    import javax.swing.*;
    public class Schedule
    {
    public static void main(String[] args)
    {
     
     
    String[][] classSchedule =  {{"CIS 110 ", "ENG 111 ", "MAT 070 ","WEB 110 "},
    {"Wen 4:40 ", "Tue 5:40 ", "Mon 1:25 ", "Sat 1:00 "}};
    String myClass = "";
    int x;
    int y;
    boolean classExists = false;
    myClass = JOptionPane.showInputDialog(null, "Enter a class");
    for(x = 0; x < classSchedule.length; ++x)
    {
    for(y = 0; y < classSchedule[x].length; ++y)
     
    if(myClass.equals(classSchedule[x][y]))
    classExists = true;
     
    }
    if(classExists)
    JOptionPane.showMessageDialog(null, myClass +
    " exists");
    else
    JOptionPane.showMessageDialog(null, myClass +
    " does not exist");
    }
    }

  10. #10
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    Default Re: does not mesh with two-eimensional array

    ive found out im supposed to change the format of the array, it needs to have 4 rows and 2 columns. that doesnt change a lot though

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    Lightbulb Re: does not mesh with two-eimensional array

    package sorting;
     
    import java.util.*;
    import javax.swing.*;
    public class Schedule
    {
    public static void main(String[] args)
    {
     
     
    String[][] classSchedule =  new String[][]{{"CIS 110", "ENG 111", "MAT 070","WEB 110"},
    {"Wen 4:40", "Tue 5:40", "Mon 1:25", "Sat 1:00"}};
     
    for (int v =0; v < classSchedule.length; v++)
    {
    	for (int w =0; w < classSchedule[v].length; w++)
    		System.out.println(classSchedule[v][w]);
    }
    String myClass = "";
    int x;
    int y;
    boolean classExists = false;
    myClass = JOptionPane.showInputDialog(null, "Enter a class");
    for(x = 0; x < classSchedule.length; ++x)
    {
    for(y = 0; y < classSchedule[x].length; ++y)
    {
    if(myClass.equals(classSchedule[x][y]))
    {classExists = true;
     
     
    }
     
    }
    }
    System.out.println(classExists);
    if(classExists==true)
    JOptionPane.showMessageDialog(null, myClass +
    " exists");
    else
    JOptionPane.showMessageDialog(null, myClass +
    " does not exist");
    }
    }

    I kinda thought it might be the spaces.

  12. #12
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    Default Re: does not mesh with two-eimensional array

    I tried that code as is and got this back

    C:\Documents and Settings\Admin\Desktop>java Schedule3
    Exception in thread "main" java.lang.NoClassDefFoundError: Schedule3 (wrong name
    : sorting/Schedule3)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java :621)
    at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:12
    4)
    at java.net.URLClassLoader.defineClass(URLClassLoader .java:260)
    at java.net.URLClassLoader.access$000(URLClassLoader. java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.j ava:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:2 52)
    at java.lang.ClassLoader.loadClassInternal(ClassLoade r.java:320)
    Could not find the main class: Schedule3. Program will exit.

  13. #13
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    Default Re: does not mesh with two-eimensional array

    Get rid of my package class and it'll work.

    remove "package sorting;"

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    Default Re: does not mesh with two-eimensional array

    Also, if you're calling it tester, it won't recognize it as I've called it Schedule

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    Default Re: does not mesh with two-eimensional array

    are you on aim? ive added you because I have further questions

  16. #16
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    Default Re: does not mesh with two-eimensional array

    I have AIM, but am not on a computer that I could use it at the moment.

    Also, I've currently got it blocked so that only those on my buddy list can IM me. I'll change it later when I get back to my regular computer. I'm using a lab computer right now.

  17. #17
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    Default Re: does not mesh with two-eimensional array

    well in that case, I need to modify the program to allow the user to search for a class in the array, and display the time related to that class

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    Default Re: does not mesh with two-eimensional array

    Wouldn't it be better to have two parallel 1D arrays than to have a 2D array?

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    Default Re: does not mesh with two-eimensional array

    Could somebody help me with my program? It's almost done and I'm stuck and am spending all day when I could be getting it over with, if I weren't waiting patiently all day for help.

    Please help. I have several other things I need to get done too in other classes.

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