Import javax swing jframe ошибка

I’ve been looking all over the internet and Can’t find an answer.

I’m using Eclipse and need to import JFrame from javax.swing. But hovering over the the declaration (which in Eclipse should give you an option to import it) the import option does not show up. Instead I manually typed out the import path, but get an error.

Going even further, I used the package explorer to attempt to fine it… couldn’t. I have the latest version of Eclipse, and the Latest JRE and JDK. But still is not working.

Code:

package com.BickDev.Game;

import java.awt.Canvas;
import java.awt.Dimension;

import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {
    private static final long serialVersionUID = 1L;

    public static final int WIDTH = 320;
    public static final int HEIGHT = WIDTH / 12 * 9;
    public static final int SCALE = 2;
    public final String TITLE = "Troy's Game Test";
    private boolean running = false;


    public void run() {

    }

    public static void main(String args[]) {

        Game game = new Game();
        Dimension size = new Dimension(WIDTH * SCALE, HEIGHT * SCALE);
        game.setPreferredSize(size);
        game.setMaximumSize(size);
        game.setMinimumSize(size);

        JFrame frame = new JFrame(game.TITLE);
    }
}

the import javax.swing.JFrame now gives the error

Access restriction: The type JFrame is not accessible due to restriction on required library C:ProgramFilesJavajre8librt.jar

No idea what this means…

Please help….

*UPDATE found the JFrame class.. but cannot access it.

I’m following along with this tutorial, and I got a problem early in the video (at approximately 7:45). I’m trying to create a basic Java program that will launch a window, however, I can’t seem to import JFrame.

I’ve looked for other solutions on Stack Overflow, but I haven’t found one that works for me.

Here is the code I’ve written:

import javax.swing.JFrame;

public class App {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Hello World");

        frame.setVisible(true);

    }

}

I’m using Eclipse version 4.12.0 on a Macbook Pro (13-inch, Mid 2012) running macOS Mojave version 10.14.5

Expected result: A window opens when I run the program, and when I close the window, the program ends.

Actual result: No window is created and I get this error message:

Error occurred during initialization of boot layer
java.lang.module.FindException: Error reading module: /Users/username/eclipse-workspace/Swing1/bin
Caused by: java.lang.module.InvalidModuleDescriptorException: App.class found in top-level directory (unnamed package not allowed in module)

Я смотрю по всему Интернету и не могу найти ответ.

Я использую Eclipse и мне нужно импортировать JFrame из javax.swing. Но зависание над объявлением (которое в Eclipse должно предоставить вам возможность импортировать его) параметр импорта не отображается. Вместо этого я вручную напечатал путь импорта, но получаю сообщение об ошибке.

Идя еще дальше, я использовал проводник пакетов, чтобы попытаться это сделать… не смог. У меня есть последняя версия Eclipse, а также последняя JRE и JDK. Но все еще не работает.

код:

package com.BickDev.Game;

import java.awt.Canvas;
import java.awt.Dimension;

import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {
    private static final long serialVersionUID = 1L;

    public static final int WIDTH = 320;
    public static final int HEIGHT = WIDTH / 12 * 9;
    public static final int SCALE = 2;
    public final String TITLE = "Troy Game Test";
    private boolean running = false;


    public void run() {

    }

    public static void main(String args[]) {

        Game game = new Game();
        Dimension size = new Dimension(WIDTH * SCALE, HEIGHT * SCALE);
        game.setPreferredSize(size);
        game.setMaximumSize(size);
        game.setMinimumSize(size);

        JFrame frame = new JFrame(game.TITLE);
    }
}

импорт javax.swing.JFrame теперь дает ошибку

Access restriction: The type JFrame is not accessible due to restriction on required library C:ProgramFilesJavajre8librt.jar

Не знаю, что это значит…

Пожалуйста, помогите….

* UPDATE нашел класс JFrame.. но не может получить к нему доступ.

Я смотрю по всему Интернету и не могу найти ответ.

Я использую Eclipse и мне нужно импортировать JFrame из javax.swing. Но зависание над объявлением (которое в Eclipse должно предоставить вам возможность импортировать его) параметр импорта не отображается. Вместо этого я вручную напечатал путь импорта, но получаю сообщение об ошибке.

Идя еще дальше, я использовал проводник пакетов, чтобы попытаться это сделать… не смог. У меня есть последняя версия Eclipse, а также последняя JRE и JDK. Но все еще не работает.

код:

package com.BickDev.Game;

import java.awt.Canvas;
import java.awt.Dimension;



  


                       
  





import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {
    private static final long serialVersionUID = 1L;

    public static final int WIDTH = 320;
    public static final int HEIGHT = WIDTH / 12 * 9;
    public static final int SCALE = 2;
    public final String TITLE = "Troy Game Test";
    private boolean running = false;

    public void run() {

    }

    public static void main(String args[]) {

        Game game = new Game();
        Dimension size = new Dimension(WIDTH * SCALE, HEIGHT * SCALE);
        game.setPreferredSize(size);
        game.setMaximumSize(size);
        game.setMinimumSize(size);

        JFrame frame = new JFrame(game.TITLE);
    }
}

импорт javax.swing.JFrame теперь дает ошибку

Access restriction: The type JFrame is not accessible due to restriction on required library C:ProgramFilesJavajre8librt.jar

Не знаю, что это значит…

Пожалуйста, помогите….

* UPDATE нашел класс JFrame.. но не может получить к нему доступ.

import javax.swing.JFrame;

public class App {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Hello World");

        frame.setVisible(true);

    }

}

Error occurred during initialization of boot layer
java.lang.module.FindException: Error reading module: /Users/username/eclipse-workspace/Swing1/bin
Caused by: java.lang.module.InvalidModuleDescriptorException: App.class found in top-level directory (unnamed package not allowed in module)

3 ответа

package demo;

import java.awt.Dimension;

import javax.swing.JFrame;

public class App {

    public static void main(String[] args) {

        JFrame frame = new JFrame("Hello World");

        frame.setLocationRelativeTo(null);
        frame.setSize(new Dimension(400, 400));
        frame.setVisible(true);

    }

}

requires java.desktop;

I used to have the same problem; here’s how to solve it.
You see, we were trying to use swing lib in a totally wrong context, that is, within an Android app. As Scott Barta pointed out, Android has its own mechanisms for doing what we wanted to achieve and that’s why IntelliJ didn’t let us import anything that would interfere with Android API.
Hence, do NOT use Android app when, say, simply learning how to code in Java or, on a more advanced level, when testing/debugging your algorithms. Instead, build a standalone Java program (yes, in Android Studio). This very topic is covered here: Can Android Studio be used to run standard Java projects? , «Tested on Android Studio 0.8.6 — 1.0.2» by idunnololz). A few clarifying remarks to this solution:
1) wnen preparing your configuration (Run | Edit Configurations…), use your new Java module name and its main class in the appropriate fields.
2) before clicking Run make sure you selected same configuration.

Incidentally, there indeed IS a way to import swing library into any Android app: based on http://www.youtube.com/watch?v=fHEvI_G6UtI. Specifically, add a new line to build.gradle file for your Module:app:
compile files ('<path_to_your_jdk's_rt.jar>')
Like this:
compile files ('C:/Program Files/Java/jdk1.8.0_31/jre/lib/rt.jar')
Note single quotes and forward slashes. Then click Sync Gradle icon and enjoy the view.

In our particular case, however, the program won’t run. The code itself will be clean, there’ll be no errors; with swing lib well in place and connected, IntelliJ won’t suspect a thing; the project WILL compile… but then we’ll get a runtime error. Now your know why. On the other hand, this method works like magic when we do not interfere with Android API — which we shouldn’t in the first place.

That’s all there is to it.