The traversal method of set set in Java

Source: Internet
Author: User
Tags set set

S Child Collection Traversal:

The first type: for enhanced loops

set<string> set = new hashset<string> ();

for (String Str:set) {
System.out.println (str);

Second type: iterator traversal

Iterator<string> it = Set.iterator ();
while (It.hasnext ()) {
System.out.println (;

The third type: less use (mainly for generic traversal)

Like what:

set<object> set = new hashset<object> ();

For (Object obj:set) {
if (obj instanceof integer) {//If integer type Object
int aa= (Integer) obj; Converting from wrapper class integer to basic data type
}else if (obj instanceof string) {//If a string object is converted to a string type
string aa = (string) obj

The traversal method of set set in Java

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