ThetypeJOptionPaneisnotaccessibleduetorestrictionon

今天在做JAVA编程实验，在使用Eclipse编译时出现了以下编译错误： Access restriction: The type JOptionPane is not accessible due to restriction on required library D:\ProgramFiles\Java\jdk1.8.0\jre\lib\rt.jar 在网上搜了一下，解决办法是修改编译

今天在做JAVA编程实验，在使用Eclipse编译时出现了以下编译错误：

Access restriction: The type JOptionPane is not accessible due to restriction on required library D:\Program Files\Java\jdk1.8.0\jre\lib\rt.jar

在网上搜了一下，解决办法是修改编译选项，方法如下：Window -> Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and restricted API -> Forbidden reference (access rules) -> Warnings，或者在项目上修改编译选项。

import javax.swing.JOptionPane;
public class MyFirstApplication{
	public static void main(String[] args){
	JOptionPane.showMessageDialog(null,"Hello it is a joke!");
	}
	}