我想恢复MAc os 10.7.4的默认java类路径

我已经问过www.google.com很多次了，但我似乎不知道如何将其恢复到默认状态

我现在不能简单地编译和运行java文件

romel$ java test.java 
Exception in thread "main" java.lang.NoClassDefFoundError: test/java
Caused by: java.lang.ClassNotFoundException: test.java
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

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您的测试类在哪个包中

假设您没有指定包，那么要运行的命令将是

javatest

。通过运行“test.java”，它正在名为“test”的包（目录）中查找名为“java”的类

例如：

test.java

class test {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

---

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系统类路径位于

/system/Library/Java/JavaConfig.plist

中。默认值为：

<key>DefaultClasspath</key>
    <string>$HOME/Library/Java:$NEXT_ROOT/Library/Java:$NEXT_ROOT/System/Library/Java:$NEXT_ROOT/Network/Library/Java:$NEXT_ROOT/System/Library/Frameworks/JavaVM.framework/Classes/classes.jar:$NEXT_ROOT/System/Library/Frameworks/JavaVM.framework/Classes/ui.jar</string>

DefaultClasspath
$HOME/Library/Java:$NEXT\u ROOT/Library/Java:$NEXT\u ROOT/System/Library/Java:$NEXT\u ROOT/Network/Library/Java:$NEXT\u ROOT/System/Library/Frameworks/JavaVM.framework/Classes/Classes.jar:$NEXT\u ROOT/System/Library/Frameworks/JavaVM.framework/Classes/ui.jar

试试这个

java test

并且您的类名必须在第一个单词中大写，如下面的

Test

java test