how to use FileSystem Object API

[Ved Prakash]

I m trying to run following code

public class localtohdfs {
public static void main()
{
          Configuration config = new Configuration();
          FileSystem hdfs = FileSystem.get(config);
          Path srcPath = new Path("/root/testfile");
          Path dstPath = new Path("testfile_hadoop");
          hdfs.copyFromLocalFile(srcPath, dstPath);
}
}

when I do javac i see
[r...@nlb-2 hadoop-0.17.2.1]# javac localtohdfs.java
localtohdfs.java:3: package org.apache.hadoop does not exist
import org.apache.hadoop.*;
^
localtohdfs.java:7: cannot find symbol
symbol  : class Configuration
location: class localtohdfs
          Configuration config = new Configuration();
          ^
localtohdfs.java:7: cannot find symbol
symbol  : class Configuration
location: class localtohdfs
          Configuration config = new Configuration();
                                     ^
localtohdfs.java:8: cannot find symbol
symbol  : class FileSystem
location: class localtohdfs
          FileSystem hdfs = FileSystem.get(config);
          ^
localtohdfs.java:8: cannot find symbol
symbol  : variable FileSystem
location: class localtohdfs
          FileSystem hdfs = FileSystem.get(config);
                            ^
localtohdfs.java:9: cannot find symbol
symbol  : class Path
location: class localtohdfs
          Path srcPath = new Path("/root/testfile");
          ^
localtohdfs.java:9: cannot find symbol
symbol  : class Path
location: class localtohdfs
          Path srcPath = new Path("/root/testfile");
                             ^
localtohdfs.java:10: cannot find symbol
symbol  : class Path
location: class localtohdfs
          Path dstPath = new Path("testfile_hadoop");
          ^
localtohdfs.java:10: cannot find symbol
symbol  : class Path
location: class localtohdfs
          Path dstPath = new Path("testfile_hadoop");
                             ^
9 errors

CLASS_PATH="/root/newhadoop/hadoop-0.17.2.1/src/java:/root/newhadoop/hadoop-0.17.2.1/conf:/usr/java/jdk1.6.0/lib"
PATH="/usr/java/jdk1.6.0/bin:/usr/local/apache-ant-1.7.1/bin:/root/newhadoop/hadoop-0.17.2.1/bin:/usr/lib/jvm/java-1.5.0-sun-1.5.0.13/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"
HADOOP_HOME="/root/newhadoop/hadoop-0.17.2.1"
JAVA_HOME="/usr/java/jdk1.6.0/"

Where is the problem?

thanks and regards!