Java 无法在Eclipse for mac中使用JFrame

我是一名编程新手，如果我使用了错误的术语，请原谅。我在macbook air上编程并使用Eclipse，但当我尝试导入javax.swing和java.awt时，它不起作用，我收到一条错误消息，请参见下面的内容。我做了很多研究，发现有些人也有类似的问题，但由于我是一个初学者，我真的不理解从项目依赖项中删除swt.jar这样的答案。如果你知道我能做些什么，我将非常感谢你的解决方案。这是我尝试的程序和出现的错误消息

import java.awt.*;
import javax.swing.*;



    class WindowTest extends JFrame

    {
        public WindowTest (){
            super ("Hi");
            setSize (300,100);
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setVisible (true);

            Container contentArea = getContentPane();
            contentArea.setBackground(Color.white);

            FlowLayout flowManager = new FlowLayout();
            contentArea.setLayout(flowManager);

            JLabel TextLabel = new JLabel ("I am here");
            contentArea.add(textLabel);

            JLabel TextLabel2 = new Jlabel ("OK");
            contentArea.add(TextLabel2);

            JTextField textBox = new JTextField ("Write here",20);
            contentArea.add(textBox);

            JTextArea comments = new JTextArea ("Comments please",3,20);
            contentArea.add(comments);

            JButton pointlessButton = new JButton ("Exit");
            contentArea.add(pintlessButton);

        }
    }


public class TestWindow {

    public static void main(String[] args) {
        WindowTest Win = new WindowTest();
    }

}

以及错误消息：

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
Access restriction: The type JFrame is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The constructor JFrame(String) is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The method setDefaultCloseOperation(int) from the type JFrame is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JFrame is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The field EXIT_ON_CLOSE from the type JFrame is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The method getContentPane() from the type JFrame is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JLabel is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The constructor JLabel(String) is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JLabel is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
textLabel cannot be resolved
Access restriction: The type JLabel is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Jlabel cannot be resolved to a type
Access restriction: The type JTextField is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The constructor JTextField(String, int) is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JTextField is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JTextArea is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The constructor JTextArea(String, int, int) is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JTextArea is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JButton is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The constructor JButton(String) is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
Access restriction: The type JButton is not accessible due to restriction on required library /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar
pintlessButton cannot be resolved

at WindowTest.<init>(TestWindow.java:6)
at TestWindow.main(TestWindow.java:43)

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谢谢

可能是您的类所放置的目录，具有访问限制。请继续并授予您的java目录777权限。 除此之外，这并不意味着任何与mac相关的问题

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您可以使用sudo chmod-R 777~directory_path

是否安装了java？这是系统中JDK的权限问题。请尝试清理并重新构建您的项目。。。。项目|清洁…|大家都看到了这个类似的问题：我确实安装了Java，但我有两个不同的版本。你认为如果我卸载其中一个会有所改善吗？