同样是1.8的jdk,为什么用eclipse能运行 用dos就出错了?

[今天喝柠檬茶]

事情是这样的:我使用这行调用window风格:
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
然后在eclipse里能正常使用,但是在自己配置的运行环境中就有如下报错了,这是为什么呢

java.lang.ClassNotFoundException: com.sun.java.swing.palf.windows.WindowsLookAndFeel
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1874)
        at javax.swing.UIManager.setLookAndFeel(UIManager.java:582)
        at SwingComponent.changeFlavor(SwingComponent.java:182)
        at SwingComponent.lambda$init$1(SwingComponent.java:146)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
        at java.awt.Component.processMouseEvent(Component.java:6533)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
        at java.awt.Component.processEvent(Component.java:6298)
        at java.awt.Container.processEvent(Container.java:2236)
        at java.awt.Component.dispatchEventImpl(Component.java:4889)
        at java.awt.Container.dispatchEventImpl(Container.java:2294)
        at java.awt.Component.dispatchEvent(Component.java:4711)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
        at java.awt.Container.dispatchEventImpl(Container.java:2280)
        at java.awt.Window.dispatchEventImpl(Window.java:2746)
        at java.awt.Component.dispatchEvent(Component.java:4711)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
        at java.awt.EventQueue$4.run(EventQueue.java:731)
        at java.awt.EventQueue$4.run(EventQueue.java:729)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[soton_dolphin]

classpath 设置对了吗？

[今天喝柠檬茶]

引用 1 楼 soton_dolphin 的回复:

classpath 设置对了吗？

我的设置:.;%java_HOME%\lib;%java_HOME%\bin; 前面有个点, 这是我设置的java_HOME:E:\java\jdk1.8.0_101

[尼古拉斯-全蛋]

dos里跑个javac 先试试环境配对没

[今天喝柠檬茶]

引用 3 楼 qnmdcsdn 的回复:

dos里跑个javac 先试试环境配对没

环境没有设置错啊,还有我给按钮添加了图标,但是在eclipse里运行不显示图标,dos里面运行就可以显示图标.

[今天喝柠檬茶]

引用 4 楼 zblzbl1991 的回复:

引用 3 楼 qnmdcsdn 的回复:

dos里跑个javac 先试试环境配对没

环境没有设置错啊,还有我给按钮添加了图标,但是在eclipse里运行不显示图标,dos里面运行就可以显示图标.

我设置了绝对路径,有的图片能显示,有的不显示,是因为大小限制吗? 18X18像素的显示,20X20的不显示.

[解开者]

com.sun.java.swing.palf.windows.WindowsLookAndFeel 这个类，运行的时候，要能被类加载器加载（也就是在jre的类加载器、或自定义类加载器查找类文件的路径下，一般jre环境把jre类加载器设为环境变量，值为【.】，即执行java进程的当前路径），一般IDE都会自动管理；而从控制台启动jre时，就需要关注这一点 两种方式，或者把这个类的class文件放进和主类相同路径，或者把这个类所在路径加到环境变量里边