OC和Java

1-OC和Java中迭代

        NSSet *set1 = [NSSet setWithObjects:@"one", @"two", @"two", nil];
        NSEnumerator *e = [set1 objectEnumerator];
        NSString *s;
        while((s = [e nextObject]) != nil) {
            NSLog(@"%@", s);
        }

2-数组转集合

        NSArray *arr2 = @[@"one", @"one", @"two", @"tow"];
        NSSet *set = [NSSet setWithArray:arr2];
        NSLog(@"%@", set);

3-Map

 　　　　NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:@"IOS", @"1", @"Android", @"2", @"cocos2d-x", @"3", nil];
        NSLog(@"%@", dic);

        NSArray *keys = @[@"1", @"2", @"3", @"3"];
        NSArray *values = @[@"Android", @"iOS", @"cocos2dx", @"wp8"];
        NSDictionary *dc3 = [NSDictionary dictionaryWithObjects:values forKeys:keys];
        NSLog(@"%@", dc3);