NSMutableArray 物件生存週期

物件加入時retainCount自動+1，而物件移出後值-1

而與NSArray差異為此物件元素經宣告後無法變更，元素的內容，仍可變更

[self testArrary];

-(void)testArrary

{

NSMutableArray *array =[[NSMutableArray alloc] init];

NSObject *myObj4 = [[NSObject alloc] init];

[array addObject:myObj4];

NSLog(@"after add to array retainCount = %d",[myObj4 retainCount]);

[array removeObject:myObj4];

NSLog(@"after reomve from array retainCount = %d",[myObj4 retainCount]);

}

MyObject 已改用 NSObject