A problem with the import part

[gyijhbk]

When I try to import a class it says: error: cannot find symbol.I am sure about the path of the class and the name.

[Norm]

Please post the full text of the error message and the source where the error occurs.

[gyijhbk]

import java.io.someclass1;
import java.io.someclass2;
import java.io.someclass3;
import java.lang.String;
import java.io.*;

keyboard.java:2: error: cannot find symbol
import java.io.someclass1;
^
symbol: class GlobalKeyListener
location: package java.io
keyboard.java:3: error: cannot find symbol
import java.io.someclass2;
^
symbol: class KeyAdapter
location: package java.io
keyboard.java:4: error: cannot find symbol
import java.io.someclass3;
^
symbol: class KeyEvent
location: package java.io
the classеs are there.

[JosAH]

Is there a class 'someclass1' in the java.io pacakge? I didn't know that.

kind regards,

Jos

[gyijhbk]

This is a class which i added to java.io pacakge

[JosAH]

This is a class which i added to java.io pacakge

You can't do that; the jar where the java.io classes are stored, is sealed.

kind regards,

Jos

[gyijhbk]

But then how i can add/change classes in java.io ? before there was not a problem.

[Norm]

Extend them to make your own class.

[gyijhbk]

Ok now I have another error:
import de.ksquared.test.system.keyboar.*;
import de.ksquared.system.keyboard.GlobalKeyListener;
import de.ksquared.system.keyboard.KeyAdapter;
import de.ksquared.system.keyboard.KeyEvent;

package de.ksquared.test.system.keyboard;


public class KeyboardHookTest {
public static void main(String[] args) {
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
@Override public void keyPressed(KeyEvent event) { System.out.println(event); }
@Override public void keyReleased(KeyEvent event) {
System.out.println(event);
if(event.getVirtualKeyCode()==KeyEvent.VK_ADD
&& event.isCtrlPressed())
System.out.println("CTRL+ADD was just released (CTRL is still pressed)");
}
});
while(true)
try { Thread.sleep(100); }
catch(InterruptedException e) { e.printStackTrace(); }
}
}


D:\project>javac KeyboardHookTest.java
KeyboardHookTest.java:6: error: class, interface, or enum expected
package de.ksquared.test.system.keyboard;
^
1 error

[Norm]

The package statement goes first.

[gyijhbk]

Ok now I got this:
KeyboardHookTest.java:4: error: package de.ksquared.test.system.keyboar does not
exist
import de.ksquared.test.system.keyboar.*;
^
KeyboardHookTest.java:5: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.GlobalKeyListener;
^
KeyboardHookTest.java:6: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyAdapter;
^
KeyboardHookTest.java:7: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyEvent;
^
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class KeyAdapter
location: class KeyboardHookTest
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class GlobalKeyListener
location: class KeyboardHookTest

[Norm]

Are the definitions for those packages on the classpath? The compiler can not find them. What is on the classpath when you try to compile?

[gyijhbk]

Nothing it is by default

[Norm]

It needs to point to the folder that contains the folder at the start of the package: de

[gyijhbk]

and again...
D:\project>javac -classpath "C:\Program Files\Java\lib\de" KeyboardHookTest.java

KeyboardHookTest.java:4: error: package de.ksquared.test.system.keyboar does not
exist
import de.ksquared.test.system.keyboar.*;
^
KeyboardHookTest.java:5: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.GlobalKeyListener;
^
KeyboardHookTest.java:6: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyAdapter;
^
KeyboardHookTest.java:7: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyEvent;
^
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class KeyAdapter
location: class KeyboardHookTest
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class GlobalKeyListener
location: class KeyboardHookTest
6 errors

[Norm]

I said: It needs to point to the folder that contains the folder at the start of the package: de

"C:\Program Files\Java\lib\de"

Does the folder de contain a folder de?

[gyijhbk]

It is the same.
D:\project>javac -classpath "C:\Program Files\Java\lib" KeyboardHookTest.java
KeyboardHookTest.java:4: error: package de.ksquared.test.system.keyboar does not
exist
import de.ksquared.test.system.keyboar.*;
^
KeyboardHookTest.java:5: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.GlobalKeyListener;
^
KeyboardHookTest.java:6: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyAdapter;
^
KeyboardHookTest.java:7: error: package de.ksquared.system.keyboard does not exi
st
import de.ksquared.system.keyboard.KeyEvent;
^
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class KeyAdapter
location: class KeyboardHookTest
KeyboardHookTest.java:13: error: cannot find symbol
new GlobalKeyListener().addKeyListener(new KeyAdapter() {
^
symbol: class GlobalKeyListener
location: class KeyboardHookTest
6 errors

[Norm]

How about waiting on this complicated project and writing a small simple program that uses one class in a package that is in a folder. When you get that to work, then move on to this more complicated project.

There are so many things you could have set up incorrectly that chasing them all down is going to take too long. Start with a simple project.

[gyijhbk]

ok.Some suggestions>

[JosAH]

ok.Some suggestions>

Read reply #18 again.

kind regards,

Jos