Classe java.io.FileOutputStream

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import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;


public class Copy {

    public static void main(String[] args) throws Exception {
        
        if ( args.length == 0 ) {
            System.out.println( "Usage: java Copy srcFile destFile" );
            System.exit( 0 );
        }

        File sourceFile = new File( args[0] );
        FileInputStream fis = new FileInputStream( sourceFile );
        FileOutputStream fos = new FileOutputStream( args[1] );
        byte [] buffer = new byte[ 1024 * 1024 ];   // 1 mega bytes        

        long length = sourceFile.length();
        while( length > 0 ) {
            int readedBytesCount = fis.read( buffer );
            fos.write( buffer, 0, readedBytesCount );
            length -= readedBytesCount;
        }
        
        fis.close();
        fos.close();
    }
    
}