How to read a big binary file in Java -

i want read binary file in java, contains m datasets. know each dataset consists of 3 elements: long number, double number , long number in sequence. datasets repeated 1 after each other till end of file. supposing number m of datasets known, how can read file in java without passing datasets main memory, able read large files well, not "fit" in main memory?

if want sequential access:

import java.io.fileinputstream; import java.io.datainputstream;  datainputstream dis = new datainputstream(new fileinputstream("input.bin")) for(int = 0; < m; i++){     long l1 = dis.readlong();     double d1 = dis.readdouble();     long l2 = dis.readlong();     /* need */ } dis.close();