[英]Java - what is better to choose, static or nonstatic methods
因此,我想創建一個將在其中創建一些對象的類,然后將它們添加到Map中。 將有三張地圖。 對象1,對象2的映射以及對象2和對象1之間的關系的映射。 像現在一樣,我有這樣的事情:
public class SomeClass {
private static final Map<Integer, Object1> OBJECTS1 = new HashMap<>();
private static final Map<Integer, Object2> OBJECTS2 = new HashMap<>();
private static final Map<Integer, List<Integer>> OBJECTS2_IN_OBJECTS1 = new HashMap<>();
static {
Object1 object1 = new Object1(1, "someStringForObject1");
Object2 object2 = new Object2(1, "someStringForObject2");
object1.setObject2(object2);
OBJECTS1.put(object1.getId(), object1);
OBJECTS2.put(object2.getId(), object2);
SomeClass.addObject2ToObject1(object2.getId(), object1.getId());
}
public static Collection<Object1> getObjects1() {
return OBJECTS1.values();
}
public static Object1 getObject1(int id) {
return OBJECTS1.get(id);
}
public static void addObject1(Object1 object1) {
OBJECTS1.put(object1.getId(), object1);
}
public static Collection<Object2> getObjects2() {
return OBJECTS2.values();
}
public static Object2 getObject2(int id) {
return OBJECTS2.get(id);
}
public static void addObject2(Object2 object2) {
OBJECTS2.put(object2.getId(), object2);
}
public static void addObject2ToObject1(int object2Id, int object1Id) {
List<Integer> objects1OfObject2 = OBJECTS2_IN_OBJECTS1.get(object2Id);
if (objects1OfObject2 != null) {
objects1OfObject2.add(object1Id);
OBJECTS2_IN_OBJECTS1.put(object2Id, objects1OfObject2);
} else {
objects1OfObject2 = new ArrayList<>();
objects1OfObject2.add(object1Id);
OBJECTS2_IN_OBJECTS1.put(object2Id, objects1OfObject2);
}
}
}
后來在其他類中,我想例如將對象添加到地圖等。只需在這些地圖上進行一些操作即可。 例如:
class SomeOtherClass{
public Collection getObjects() {
return SomeClass.getObjects1();
}
public Object1 addObject1(int idOfObject1, String someString, int idOfObject2) {
if (SomeClass.getObject1(idOfObject1) != null) {
System.out.prinltn("Object with this id already exists.");
return null;
}
Object1 object1 = new Object1(idOfObject1, someString);
SomeClass.addObject2ToObject1(idOfObject2, idOfObject1);
SomeClass.addObject1(object1);
return object1;
}
}
所以這是我的問題。 “ SomeClass”中的方法應該是靜態或非靜態的,因此我將在每種方法中創建“ SomeClass”對象:
class SomeOtherClass{
public Collection getObjects() {
SomeClass someClass = new SomeClass();
return someClass.getObjects1();
}
public Object1 addObject1(int idOfObject1, String someString, int idOfObject2) {
SomeClass someClass = new SomeClass();
if (someClass.getObject1(idOfObject1) != null) {
System.out.prinltn("Object with this id already exists.");
return null;
}
Object1 object1 = new Object1(idOfObject1, someString);
someClass.addObject2ToObject1(idOfObject2, idOfObject1);
someClass.addObject1(object1);
return object1;
}
}
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