callback test

interface JdbcTemplateHandler {

public Object mapRow(String param, JdbcTemplateHandler handler);

}

class JdbcTemplate implements JdbcTemplateHandler {

public Object queryForObject(String param, JdbcTemplateHandler handler) {

System.out.println("query executing...");

try {

Thread.sleep(3000);

} catch (InterruptedException e) {

e.printStackTrace();

}

return mapRow(param, handler);

}

public Object mapRow(String param, JdbcTemplateHandler handler) {

return handler.mapRow(param, handler);

}

}

public class CallBackTest {

public static void main(String[] args) {

JdbcTemplate jdbcTemplate = new JdbcTemplate();

String retVal = (String)jdbcTemplate.queryForObject("123ABC", new JdbcTemplateHandler() {

public Object mapRow(String param, JdbcTemplateHandler handler) {

return "RETURN VALUE, " + param;

}

});

System.out.println("retVal : " + retVal);

}

}