SETTING TEXTFIELD IN DIFFERENT CLASS
I have 2 classes: class1, class2. In class2 I have a textfield. In class1 I am trying to set the textfield in class2 with text: class2.textField_name.setText(string). This does not work - null pointer exception???
Hi,
I have 2 classes: class1, class2. In class2 I have a
textfield. In class1 I am trying to set the textfield
in class2 with text:
class2.textField_name.setText(string). This does not
work - null pointer exception???In class 2 do something like this:
public void setTextField_nameText(String text)
jTextField_name.setText(text);
In class 1
Class2 class2=new Class2();
class2.setTextField_nameText(text);
Good luck,
ANeto
Similar Messages
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SETTING TEXTFIELD IN ANOTHER CLASS
I have 2 classes: class1, class2. In class2 I have a textfield. In class1 I am trying to set the textfield in class2 with text: class2.textField_name.setText(string). This does not work - null pointer exception???
Is this what you want???.
import javax.swing.*;
import java.awt.*;
public class class1 extends JFrame {
//Class1;
class2 ji = new class2();//class2
public junk() {
super();
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = getContentPane();
pane.setLayout(new FlowLayout());
String hello = "hello";
ji.field.setText(hello);
pane.add(ji.field);
setVisible(true);
public static void main(String[] args) {
class1 j = new class1();
class class2 {
//class2
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public class2() {}
} -
Two equal objects, but different classes?
When programming on binding Referenceable object with JDK version 1.5.0_06, I have encountered a very strange phenomenon: two objects are equal, but they belong to different classes!!!
The source codes of the program bind_ref.java are listed as below:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
import java.lang.*;
import java.io.*;
import java.util.*;
import javax.naming.*;
import javax.naming.spi.ObjectFactory;
import java.util.Hashtable;
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env.put( Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory" );
env.put( Context.PROVIDER_URL, "file:/daniel/" );
Context ctx = null;
File f = null;
Fruit fruit1 = null, fruit2 = null;
byte [] b = new byte[10];
try {
ctx = new InitialContext( env );
Hashtable the_env = ctx.getEnvironment();
Object [] keys = the_env.keySet().toArray();
int key_sz = keys.length;
fruit1 = new Fruit( "Orange" );
SubReference ref1 = fruit1.getReference();
ctx.rebind( "reference", fruit1 );
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System.out.println( "fruit2.myRef's class = (" + fruit2.myRef.getClass().toString() + ")" );
System.out.println( "( ref1 instanceof SubReference ) = " + ( ref1 instanceof SubReference ) );
System.out.println( "( fruit2.myRef instanceof SubReference ) = " + ( fruit2.myRef instanceof SubReference ) );
System.out.println( "ref1.hashCode = " + ref1.hashCode() + ", fruit2.myRef.hashCode = " + fruit2.myRef.hashCode() );
System.out.println( "ref1.equals( fruit2.myRef ) = " + ref1.equals( fruit2.myRef ) );
} catch( Exception ne ) {
System.err.println( "Exception: " + ne.toString() );
System.exit( -1 );
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
All the outputs are shown as below:
=======================================================
Fruit: I am created at Mon Jun 18 11:35:13 GMT+08:00 2007
SubReference: I am created at Mon Jun 18 11:35:13 GMT+08:00 2007
--------- (i)subref.hashCode() = (-1759114666)
SubReference: I am created at Mon Jun 18 11:35:13 GMT+08:00 2007
--------- (i)subref.hashCode() = (-1759114666)
FruitFactory: obj's class = (class javax.naming.Reference)
FruitFactory: obj's hashCode = -1759114666
FruitFactory: obj = (Reference Class Name: Fruit
Type: fruit
Content: Orange
FruitFactory: ( obj instanceof SubReference ) = false
FruitFactory: subref_class_name = (Fruit)
Fruit: I am created at Mon Jun 18 11:35:13 GMT+08:00 2007
ref1's class = (class SubReference)
fruit2.myRef's class = (class javax.naming.Reference)
( ref1 instanceof SubReference ) = true
( fruit2.myRef instanceof SubReference ) = false
ref1.hashCode = -1759114666, fruit2.myRef.hashCode = -1759114666
ref1.equals( fruit2.myRef ) = true
========================================================
I hightlight the critical codes and outputs related to the strangeness with bold texts.
Who can tell me what happens? Is it really possible that two objects belonging to different classes are equal? If so, why that?It can also depend on how you implement the equals method.
class Cat {
String name;
Cat(String n) {
name = n;
class Dog {
String name;
Dog(String n) {
name = n;
public boolean equals(Object o) {
return name.equals(o.name);
public static void main(String[] args) {
Dog d = new Dog("Fred");
Cat c = new Cat("Fred");
System.out.println(d.equals(c));
} -
Cycle Counting is not fetching All Items in Different Classes
Hi All,
My client has performed cycle counting. Ideally system has to fetech all the items in different classes. But in cycle counting listing report only able to fetch few items.
Please let me know are we missing something ?
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Regards,
John
Edited by: 911765 on Mar 14, 2012 4:36 AM1) CC won't fetch all items in all classes.
It will look at only those items that are present in the assign items screen.
It will only consider those items which have cycle count enabled flag set to Yes in item master
It will only consider those items that have a non-zero frequency for the ABC class of the item.
It will only print those items that have some onhand if you run the CC to ignore zero onhand items.
2) You can either manually add items to a CC in the assign items window.
OR
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Invoke a method in one class from a different class
I am working on a much larger project, but to keep this simple, I wrote out a little test that would convey the over all theory of the program.
What I am doing is starting out with a 2 JFrames and a Class. When the program is launched, the first JFrame opens. In this JFrame is a label and a button. When the button is clicked, the second JFrame opens. This JFrame has a textField and a button. The user puts the text in the textField and presses the button. When the button is pushed, I want the text that was just put in the textField, to be displayed in the first JFrame's label. I am trying to invoke a method in the first JFrame from the second, but nothing happens. I have also tried making the Class extend from JFrame1 and invoke it from there, but no luck. So, how do I invoke a method in a class from a different class?
JFrame1 (I omitted the layout part. I made this in Netbeans so its pretty long)
public class NewJFrame1 extends javax.swing.JFrame {
private NewClass1 nC = new NewClass1();
/** Creates new form NewJFrame1 */
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initComponents();
jLabel1.setText("Chuck");
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public static String name;
public NewClass1()
public NewClass1(String n)
name = n;
public String getName()
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}The second jFrame
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ThanksSo, how do I invoke a method in a class from a different class?Demo:
public class Main {
public static void main(String [] args) {
Test1 t1 = new Test1();
Test2 t2 = new Test2();
int i = t1.method1();
String s = t2.method2(i);
System.out.println(s);
class Test1 {
public int method1() {
return 10;
class Test2 {
public String method2(int i) {
if (i == 10)
return "ten";
else
return "nothing";
}Output is "ten".
Edited by: newark on May 28, 2008 10:55 AM -
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hello friends,
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here My code,
private void jComboBox1ItemStateChanged(java.awt.event.ItemEvent evt) {
// TODO add your handling code here:
try
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help me outOne post wasn't enough?
{color:0000ff}http://forum.java.sun.com/thread.jspa?threadID=5246634{color}
db -
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Consider a program like this
class abc
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In this program there are two classes when i compile this code in editplus i wont get any error but if i want to execute only ABC class how to do that in editplus because in editplus we usually set the file name for JAVA execution
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If i got your question right,
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make sure your code calls the setter before calling the getter
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BUG: OJC creates different classes than JAVAC making them incompatible
Using the new JDeveloper 10g production release, I saw this behaviour when I used a class compiled in JDev (with OJC) passed over RMI to a server running classes compiled with in Ant (with JAVAC).
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I will provide several exapmles, where I used several modifications, giving the output of JAVAP for the same class, once compiled by JAVAC and once by OJC, highlighting the diff.
Example #1:
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Compiled from "Test.java"
public class Test extends java.lang.Object{
static final int CONSTANT;
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}OJC:
Compiled from "Test.java"
public class Test extends java.lang.Object{
static final int CONSTANT;
static {};
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Example #2:
public class Test { final int CONSTANT = 0; }JAVAC:
Compiled from "Test.java"
public class Test extends java.lang.Object{
final int CONSTANT;
public Test();
}OJC:
Compiled from "Test.java"
public class Test extends java.lang.Object{
final int CONSTANT;
void $init$();
public Test();
Example #3:
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Compiled from "Test.java"
public class Test extends java.lang.Object{
static int CONSTANT;
public Test();
static {};
}OJC:
Compiled from "Test.java"
public class Test extends java.lang.Object{
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static {};
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Example #4:
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int CONSTANT;
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}OJC:
Compiled from "Test.java"
public class Test extends java.lang.Object{
int CONSTANT;
void $init$();
public Test();
}I also have two examples where both compilers produce the same output for JAVAP:
public class Test { static int CONSTANT; }
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Classes compiled with OJC should not be incompatible with classes compiled with JAVAC with the same settings!
Regards,
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I simply used javap to find out the difference between the classes, and highlighted the differences in bold - that would be a good place to start looking for the bug.
Besides I'm not sure how to create a test that loads two versions of the same class not using RMI (perhaps via a special ClassLoader?)
Regards,
Yaniv Kunda -
Adding 2 JPanels, different classes
Hi,
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How could I do this?
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Java interfaces and containers in different classes
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What I am also trying is something similar to these code snippets:
I want to add this.............:
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private Thread lists;
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good
Thanks :)
Are you sure that you want to use a Container and not a JPanel or JComponent? This is Swing after all.Hi i set up the method as below which seemed to work:
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networkPanel.setLayout(new GridLayout(5,2));
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networkPanel.add(netDrives);
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networkPanel.add(typeName);
netPath = new JTextField("\\\\Server\\Share\\Name",20);
networkPanel.add(netPath);
nameDrive = new JTextField("X",1);
networkPanel.add(nameDrive);
add = new JButton("add");
networkPanel.add(add);
remove = new JButton("Remove");
networkPanel.add(remove);
driveList = new JComboBox();
networkPanel.add(driveList);
driveNames = new JComboBox();
networkPanel.add(driveNames);
//Adds action listeners
//Adds MenuSelection to the menu's
remove.addActionListener(this);
add.addActionListener(this);
driveList.addActionListener(this);
//return the content panel
return networkPanel;
}it is set up in the header to return container
public Container setup()
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So have now changed it to read:
public JPanel setup()
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I enclosed my code as below:
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import javax.microedition.lcdui.*;
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Project settings saved
Building "SelectCustest"
C:\WTK22\apps\SelectCustest\src\Catalogues.java:29: cannot resolve symbol
symbol : method getSelectedIndex ()
location: class javax.microedition.lcdui.Displayable
switch(parent.getSelectedIndex()){
^
1 error
com.sun.kvem.ktools.ExecutionException
Build failed
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here's a line from my test script
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123foo
abc
qafoozv
qaz
wsx
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zxcfooh
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::number of args: 4
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when I took xargs out of the script, nothing was passed to the class:
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Any devices connected to the same icloud account can sync all the data on that account. For this reason an icloud account is really for a single user.
On a mac, if each user has their own account, then the itunes for that mac account should be set up to connect to that user's icloud account (System preferences>icloud). -
How do you set up two different ipads on one computer ?
I purchased a new ipad for my wife and want to get her started but we both use one imac as our desktop system. How do you set up two different uses on one computer.
Thanks,
DaveOther options not covered in the article:
1) You can plug both in under the same computer username and same iTunes Apple ID and give each device it's own name. You should be able to manage them as separate devices with different media, apps and screen layouts. All of your media would be in a common pool, though.
2) Under one computer username, you can login and logout of two different iTunes Apple IDs. This option is cleaner with two computer usernames but it can be done with one.
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