hashSet的遍曆andJava的潛規則

package thinkingInJava4;</p><p>import java.util.HashSet;<br />import java.util.Iterator;<br />import java.util.Set;</p><p>public class InnerClassTest {</p><p> private static final Set<String> VALID_CODES = new HashSet<String>() {{<br /> add("XZ13s");<br /> add("AB21/X");<br /> add("YYLEX");<br /> add("AR2D");<br />}}; </p><p>public static void main(String[] args) {<br />//把set轉換成數組<br /> Object o[] = VALID_CODES.toArray();<br /> for(int i=0;i<o.length;i++){<br /> System.out.println((String)o[i]);<br /> }<br /> //迭代器<br /> Iterator<String> it = VALID_CODES.iterator();<br /> while(it.hasNext()){<br /> String temp = it.next();<br /> System.out.println(temp);<br /> }<br />}</p><p>}<br />