ArrayList list = new ArrayList();
list.add("h");
list.add("e");
list.add("l");
list.add("l");
list.add("o");
for (int i = 1; i < 10; i++) {
list.add(i);
}
Iterator it = list.iterator();
while (it.hasNext()) {
out.println(it.next() + "<br/>");
}
HashSet hs = new HashSet();
hs.add("A");
hs.add("B");
hs.add("C");
hs.add("C");
hs.add("C");
HashMap hm = new HashMap();
hm.put("a", "A");
hm.put("b", "B");
Iterator its = hs.iterator();
while (its.hasNext()) {
out.println(its.next() + "<br/>");
}
Iterator itr = hm.entrySet().iterator();
while (itr.hasNext()) {
Map.Entry pair = (Map.Entry) itr.next();
out.println(pair.getKey() + " => " + pair.getValue() + "<br/>");
}
String[] strarr = new String[10];
for (int i = 0; i < 10; i++) {
strarr[i] = "abc" + i;
}
for (String valu : strarr) {
out.println(valu);
}
Ref:
- http://stackoverflow.com/questions/85190/how-does-the-java-for-each-loop-work
- http://stackoverflow.com/questions/4131655/what-is-the-difference-between-lists-arraylists-maps-hashmaps-collections-et
- https://www.quora.com/What-is-the-difference-between-a-Set-and-a-Map-in-Java
- http://stackoverflow.com/questions/1066589/iterate-through-a-hashmap
- http://stackoverflow.com/questions/1200621/how-to-declare-an-array-in-java
- http://stackoverflow.com/questions/1665834/how-can-i-initialize-a-string-array-with-length-0-in-java
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