Java错误总结

1.The method printf(String, Object[]) in the type PrintStream is not applicable for the arguments

项目–>属性–>Java complier–>complier compliance lever:1.5

2.the jar file has no source attachment

rt的source在jdk目录的src.zip里，将路径设置为jdk下src.zip的路径就行了。具体如下

Window>Preferences>Java>Installed JREs 选上jdk1.6.xxxx，点edit，jre system libraries下面点rt.jar的那一栏，然后选source attachment在弹出的对话框里填写src.zip的路径