我正在使用gitpod为学校项目开发游戏。问题是,由于出现“找不到符号”错误,它不会让我编译。奇怪的是,它在日食时运行良好,并且没有问题。但是,我正在使用Chromebook,目前无法下载eclipse。香港专业教育学院还尝试了另一个在线编译器,但有相同的错误。它仅在跑步类中。
package ddr;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class runner {
JFrame frame;
Panel panel; //Another error here
final int WIDTH = 800;
final int HEIGHT = 800;
public runner() {
frame = new JFrame();
panel = new Panel(); //Error here
frame.add(panel);
frame.getContentPane().setPreferredSize(new Dimension(WIDTH, HEIGHT));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.addKeyListener(panel);
setUp();
}
public static void main(String[] args) {
new runner();
}
public void setUp() {
}
}
错误在这里:
gitpod /workspace/ddr/src/ddr $ javac runner.java
Picked up JAVA_TOOL_OPTIONS: -Xmx3543m
runner.java:9: error: cannot find symbol
Panel panel;
^
symbol: class Panel
location: class runner
runner.java:16: error: cannot find symbol
panel = new Panel();
^
symbol: class Panel
location: class runner
2 errors