Map的遍历
public void testMap() {
Map<String, String> map = new Hashtable<String, String>();
map.put("1", "1s");
map.put("2", "2s");
map.put("3", "3s");
map.put("4", "4s");
map.put("5", "5s");
// 1推荐使用
for (Map.Entry<String, String> entry : map.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
System.out.println("key0=" + key + ",value0=" + value);
}
System.out.println();
// 2
Iterator iter = map.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry<String, String> entry = (Map.Entry<String, String>) iter.next();
String key = entry.getKey();
String value = entry.getValue();
System.out.println("key1=" + key + ",value1=" + value);
}
System.out.println();
// 3
Iterator iter1 = map.keySet().iterator();
while (iter1.hasNext()) {
String key = (String) iter1.next();
String value = map.get(key);
System.out.println("key2=" + key + ",value2=" + value);
}
}