Getting values in hash map in Java

Question

I am not a java developer, and this is not my homework or something. I am just in need of getting the values of these parameters: end & begin. this is what I have:

rs = [{}, {end=2013/11/5, begin=2012/11/6}]

I am wonder if I could get values like this:

rs[1].end
rs[1].begin

the source is:

protected QueryParameters prepareForm(final ActionContext context) {
    final SearchErrorLogForm form = context.getForm();
    Map<String, Object> rs = form.getValues();
    System.out.println(rs);

    /*the output is: {pageParameters={}, period={end=2013/11/5, begin=2013/11/6}} */
}

sorry, the rs type is hashmap.

please go through java arrays docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html — codeMan
– codeMan, Commented Feb 12, 2013 at 6:48
JAVA arrays does not store values in this format. It's JavaScript, JSON — asifsid88
– asifsid88, Commented Feb 12, 2013 at 6:50

joese · Accepted Answer · 2013-02-12 12:59:27Z

2

That is not a valid statement.

A proper way of assigning an array would be:

String dates[] = {"2013/11/5","2012/11/6"};
String start = dates[0];
String end = dates[1];

There is a excellent tutourial at oracle docs

Okay, that is a Map containing two Maps as it seems. The first map named "pageParameters" is empty. The second one is named period and contains two items. The key "end" maps to the value "2013/11/5". The key "begin" maps to the value "2013/11/6".

To access the objects in the map you could do like this:

final Map<String, String> period = (Map<String, String>) rs.get("period");
final String begin = period.get("begin");
final String end = period.get("end");

If you would like to change a value in the map period you will need to overwrite the already existing one:

period.put("end", "NEW_END");
rs.put("period", period);

For further information, Oracle has great tutorials on Hashmaps.

edited Feb 12, 2013 at 12:59

answered Feb 12, 2013 at 6:54

joese

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3 Comments

Matt Stone Over a year ago

for updating rs after processing begin and end date and creating new values from them, I used first periods.put(end, new_end); and periods.put(begin, new_begin); then updating rs.put(periods,periods) method but I think I did somewhere wrong cos it didnt work! could you help me to solve this too?

joese Over a year ago

I have updated the answer with what I think you where asking for.

Matt Stone Over a year ago

yes Its ok, thanks dude, I just missed "" on first parameters!

Gil Peretz · Accepted Answer · 2013-02-12 06:54:05Z

1

you can do like following:

rs[1][0] for the first

rs[1][rs[1].length-1] for the last

answered Feb 12, 2013 at 6:54

Gil Peretz

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