#javac aa.java
#java aa
Exception in thread main java.lang.NoClassDefFoundError: aa

我没有java aa.class
也出现问题阿！


.bash_profile

PATH=/usr/java/j2sdk1.4.0/bin:/usr/java/j2sdk1.4.0/jre/bin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbinPATHHOME/bin
JAVA_HOME=/usr/java/j2sdk1.4.0
CLASSPATH=/usr/java/j2sdk1.4.0/lib:/usr/java/j2sdk1.4.0/jre/lib:/usr/java/j2sdk1.4.0/lib/dt.jar:/usr/java/j2sdk1.4.0/lib/htmlconverter.jar:/usr/java
/j2sdk1.4.0/lib/tools.jar
BASH_ENV=$HOME/.bashrc
USERNAME="root"

export USERNAME BASH_ENV PATH
export JAVA_HOME
export CLASSPATH

以前没有加这行/usr/java/j2sdk1.4.0/lib/dt.jar:/usr/java/j2sdk1.4.0/lib/htmlconverter.jar:/usr/java/j2sdk1.4.0/lib/tools.jar


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是类的路径没设好。试试在运行时用"-classpath"把当前路径加上去。　　　　　　

CLASSPATH=.:/usr/java/j2sdk1.4.0/lib:/usr/java/j2sdk1.4.0/jre/lib:/usr/java/j2sdk1.4.0/lib/dt.jar:/usr/java/j2sdk1.4.0/lib/htmlconverter.jar:/usr/java
/j2sdk1.4.0/lib/tools.jar

加入当前目录就OK