Iindlela ezahlukeneyo zokwenza iMephu eJava

Ukutyhoboza ngaphezulu kweMephu kwiJava. Kule posi, sijonga iindlela ezine ezahlukeneyo esinokuzilungisa ngazo kwimephu eseJava. Ukusukela nge Java 8, singasebenzisa forEach indlela kunye neklasi ye-iterator ukuvula ngaphezulu kwemephu.



Ungawenza njani amangeniso emephu (amaqhosha kunye namaxabiso)

Map map = new HashMap(); for (Map.Entry entry : map.entrySet()) {
System.out.println('Key = ' + entry.getKey() + ', Value = ' + entry.getValue()); }


Ungazichaza njani iiMephu zamaqhosha kuphela

Map map = new HashMap(); for (Integer key : map.keySet()) {
System.out.println('Key = ' + key); }


Ungazichaza njani amaxabiso emephu kuphela

for (Integer value : map.values()) {
System.out.println('Value = ' + value); }

Idibeneyo:



Sebenzisa Iterator

Sebenzisa iGenerics:


Map map = new HashMap(); Iterator entries = map.entrySet().iterator(); while (entries.hasNext()) {
Map.Entry entry = entries.next();
System.out.println('Key = ' + entry.getKey() + ', Value = ' + entry.getValue()); }

Ngaphandle kwegeneric:

Map map = new HashMap(); Iterator entries = map.entrySet().iterator(); while (entries.hasNext()) {
Map.Entry entry = (Map.Entry) entries.next();
Integer key = (Integer)entry.getKey();
Integer value = (Integer)entry.getValue();
System.out.println('Key = ' + key + ', Value = ' + value); }


Ukujikeleza ngaphezulu kwezitshixo kunye nokukhangela amaxabiso

Map map = new HashMap(); for (Integer key : map.keySet()) {
Integer value = map.get(key);
System.out.println('Key = ' + key + ', Value = ' + value); }


Sebenzisa iJava 8 ye-Forach

Map items = new HashMap();
items.put('key 1', 1);
items.put('key 2', 2);
items.put('key 3', 3);
items.forEach((k,v)->System.out.println('Item : ' + k + ' Count : ' + v));