报错信息如下 : Exception in thread "main" java.awt.AWTError: BoxLayout can't be shared at javax.swing.BoxLayout.checkContainer(BoxLayout.java:465) at javax.swing.BoxLayout.invalidateLayout(BoxLayout.java:249) at javax.swing.BoxLayout.addLayoutComponent(BoxLayout.java:282) at java.awt.Containe...
Printing Java 1.1 gives components the ability to print. The rest There are many other new features, including more flexible use of cursors; the ability to use system color schemes, and thus make your program look like other software in the run-time environment; more image filters to play ...
In Java, WindowListener Interface is under java.awt.event package. This interface is used when the state of the window is changed. It has 7 methods which are as following: 1. public abstract void windowActivated(WindowEvent e); 2. public abstract void windowClosed(WindowEvent e); ...
读Core java 卷I,14.1节的时候,有一段用于在UI上面移动小球的代码,用了paint方法,而不是我们平时用的比较多的repaint,而且jdk文档中明确注明了不推荐直接调用paint,所以有些困惑。 对此,书中的解释是:But if you try to call comp.repaint()in this program, you’ll find that the panel is only repainted...
Exception in thread "main" java.awt.AWTError: Can't connect to X11 window server using ':0' as the value of the DISPLAY variable 解决办法 看看你的家目录下面是否有~/.bash_profile这个文件,如果没有就新建一个输入一下内容: exportJAVA_OPTS=-Djava.awt.headless=true ...
Exception in thread “main“ java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibilit,找到如下文件(在/usr/lib/jvm下看看类似java-8-openjdk-amd64的目录):jre/lib/accessibility.properties注释以下语句:#assistive_technologies=org.GNOME.Ac
链接:https://pan.baidu.com/s/1rRzwi5ChH-XurQxzZQi_Ig 提取码:y08w(文件失效可联系我) 1.右键项目->Build Path->Configure Build Path..-> 2.然后如果下载的jonl文件在外边,选第二个Add External JARs...出现下面的框,选中这两个 jar包,由于每个人存储位置不一样,这里主要就是要导入jar包,如果原本...
第一，e.getActionCommand()=="登陆"这种写法绝对错误，比较字符串的值应该永远使用equals方法而不是==，下面同理；第二，in1和in2中至少有一个运行时为空，自己调试检查。
教你一个通用方法，以后再出现“java.lang.NullPointerException”，就要明白，是因为调用了一个object的方法 && 此object的reference为null；比如说 String a=null；//a即为一个String类型的reference a.trim(); //这行代码就会报“java.lang.NullPointerException”错 //误;...
在下面Java applet程序的横线处填入代码,使程序完整并能够正确运行。 import java.awt. *: import java.applet.*; public class Greeting extends Applet public void ___ (Graphics g) g.drawString("how are you!",10,10);