NSArray的removeAllObjects

removeAllObjects会让element自动release.

下面是一个二维数组的用法。

NSMutableArray* buddyList = [[NSMutableArray alloc] init];for (int i=0; i<5; i++) {[buddyList addObject:[[NSMutableArray alloc] init]];}for (int i=0; i<5; i++) {for (int j=0; j<6; j++) {NSString* str = [NSString stringWithFormat:@"%d%d", i, j];[[buddyList objectAtIndex:i] addObject:str];}}//the 1th way to releaseint i = 0;int j = 0;//1th wayfor (i=0; i<[buddyList count]; i++) {[[buddyList objectAtIndex:i] removeAllObjects];}[buddyList removeAllObjects];[buddyList release];//the 2th way to releasefor (i=0; i<[buddyList count]; i++) {for (j=0; j<[[buddyList objectAtIndex:i] count]; j++) {[[[buddyList objectAtIndex:i] objectAtIndex:j] release];}[[buddyList objectAtIndex:i] release];}[buddyList release];