Java 几个类或者方法的用法

String separetor = File.separator;
// 获取系统的文件分隔符

System.getProperty("user.dir")
// 获得当前的工作路径

//编码
ByteBuffer buffer = cset.encode("dafafe");
byte[] bytes = buffer.array();
//转码
byte[] byt={1,2};
ByteBuffer bbuf = ByteBuffer.wrap(byt);
CharBuffer cbuf = cset.decode(bbuf);
String str = cbuf.toString();

StringTokenizer t = new StringTokenizer(s, "|"); // 分隔符工具
[code=java]//文件过滤
public class ExtensionFilter implements FilenameFilter {

private String extension;
public ExtensionFilter(String ext){
extension = "."+ext;
}
@Override
public boolean accept(File dir, String name) {
return name.endsWith(extension);
}

}

//使用
File directory=new File(filename);
String[] files = directory.list(new ExtensionFilter());