How to get content of HashMap and displat it on Android?

Question

I have this :

HashMap<String, String[]> strs = new HashMap<String, String[]>(); 
String [] morning_food = new String [8];
String [] snack1_food = new String [6];
String [] lunch_food = new String [12];
String [] snack2_food = new String [4];
String [] nite_food = new String [10];

strs.put("Breakfast", morning_food);
strs.put("Snack1", snack1_food);
strs.put("Lunch", lunch_food);
strs.put("Snack2", snack2_food);
strs.put("Dinner", nite_food);

How to get the content of strs? I want to print out or display it into Log. Thx

I see this questions lacks research, because data from a `HashMap` can be retrieved with a key, which is the first parameter of the put method, and you use the get method with the key value to retrieve data... — Alvin Baena, Nov 03 '11 at 12:41
[This has been answered elsewhere](http://stackoverflow.com/questions/1066589/java-iterate-through-hashmap/1066607#1066607) — Mr. S, Nov 03 '11 at 12:41
mine is String [], the object is array, it is different problem should be >_ — Michelle, Nov 03 '11 at 14:26

Simeon · Accepted Answer · 2011-11-04T08:07:36.633

1

strs.toString() ?

OR

You can:

for (String[] vals : strs.values()) {
    for (String val : vals) {
        System.out.print(val);
    }
}

edited Nov 04 '11 at 08:07

answered Nov 03 '11 at 12:41

Simeon

7,582
15
64
101

both of them, it is not display the content of String [] morning_food = new String [8]; String [] snack1_food = new String [6]; String [] lunch_food = new String [12]; String [] snack2_food = new String [4]; String [] nite_food = new String [10]; – Michelle Nov 03 '11 at 16:35

score 0 · Answer 2 · answered Nov 03 '11 at 12:40

0

strs.toString() will return the content of the map as a String. It will delegate to the default toString of the arrays, which won't print anything useful, though. So you should use a List instead of a String[] as the value type of the map:

Map<String, List<String>> strs = new HashMap<String, List<String>>(); 
strs.put("Breakfast", new ArrayList<String>());
...

Collections should generally be preferred over arrays, in most of the cases.

answered Nov 03 '11 at 12:40

JB Nizet

678,734
91
1,224
1,255

so where I should put this String [] morning_food = new String [8]; String [] snack1_food = new String [6]; String [] lunch_food = new String [12]; String [] snack2_food = new String [4]; String [] nite_food = new String [10]; so they are relating ? – Michelle Nov 03 '11 at 14:30
You don't put it anywhere. A list has a dynamic size. Once you add something to it, its size will automatically be incremented. Read the javadoc: it's a core class that must be known. – JB Nizet Nov 03 '11 at 15:29

score 0 · Answer 3 · answered Nov 03 '11 at 12:44

0

String[] str-new String[strs.size()];
Set set=strs.keySet();
for(int i=0;i<strs.size();i++){
str[i]=strs.get(set.get(i));
}

Here str array will contain all the values.else you can directly use strs.get(set.get(i)).

answered Nov 03 '11 at 12:44

Android Killer

18,174
13
67
90

How to get content of HashMap and displat it on Android?

3 Answers3