import jdbm.htree.HTree; //导入依赖的package包/类
public FruitBasket()
    throws IOException
{
    // create or open fruits record manager
    Properties props = new Properties();
    recman = RecordManagerFactory.createRecordManager( "fruits", props );

    // create or load fruit basket (hashtable of fruits)
    long recid = recman.getNamedObject( "basket" );
    if ( recid != 0 ) {
        System.out.println( "Reloading existing fruit basket..." );
        hashtable = HTree.load( recman, recid );
        showBasket();
    } else {
        System.out.println( "Creating new fruit basket..." );
        hashtable = HTree.createInstance( recman );
        recman.setNamedObject( "basket", hashtable.getRecid() );
    }
}
 

import jdbm.htree.HTree; //导入依赖的package包/类
/**
 * Initialize RecordManager and HTree
 */
protected void init()
    throws IOException
{
    recman = RecordManagerFactory.createRecordManager( jdbmName );

    // create or reload HTree
    long recid = recman.getNamedObject( name );
    if ( recid == 0 ) {
        hashtable = HTree.createInstance( recman );
        recman.setNamedObject( name, hashtable.getRecid() );
    } else {
        hashtable = HTree.load( recman, recid );
    }

}
 

import jdbm.htree.HTree; //导入依赖的package包/类
public static HTree loadPersistentMap(RecordManager recman, String mapName) throws IOException {
	long recid = recman.getNamedObject(mapName);
	HTree ret;
	if (recid != 0) {
		ret = HTree.load(recman, recid);
	} else {
		ret = HTree.createInstance(recman);
		recman.setNamedObject(mapName, ret.getRecid());
	}
	return ret;
}