摘要：NSString *str = [NSString stringWithString:[[NSString alloc] initWithFormat:@"123"]]; int i= [str retainCount]; //2 方法中套init，套用的init不会自动release NSString *str2 = [[NSString alloc] initWithFormat:[[NSString alloc] initWithFormat:@"456"]]; int i2= [str2 retainCount]; //1 重新分配内存总结：最好
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