标签:包在 read STDIN BufferedReader memory new disk InputStreamReader
Reading from main memory is faster than reading from disk/STDIN.
BufferedReader uses a technique called buffering that allows us to reduce how often we read from disk/STDIN by copying chunks to main memory.
Consider:
BufferedReader in = new InputStreamReader(System.in);
in.read(); //
in.read(); //
// ...
in.read(); // could be hitting the disk/STDIN a lot (slow!)
vs:
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
in.read(); //
in.read(); //
// ...
in.read(); // hitting main memory a lot (fast!)
From the documentation:
Without buffering, each invocation of read() could cause bytes to be read from [disk/STDIN], converted into characters, and then returned, which can be very inefficient.
标签:包在,read,STDIN,BufferedReader,memory,new,disk,InputStreamReader 来源: https://blog.csdn.net/CodingLunatic/article/details/113854808
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