I'm new to Java, what does it mean for while(t!=-1) [READFILE]? -

i'm new java , i'm learning how read file .txt. i've stumbled across numerous notes lecture , i'm wondering why has while(t!=-1) when i'm trying read file small , simple java code.

thanks answers. :)

edit: thank guys answer. understand -1 means end-of-file, loop continue until file read. have -1? kind of specific rule in java? thank you.

import java.io.*; public class test2 { public static void main(string[] args) throws exception{ filereader inone = new filereader("myfile.txt"); int t=inone.read(); while (t!=-1) {     system.out.print((char)t);     t=inone.read();     }   } } 

i guess talking loop reads file contents.

usually looks like:

while (int symbol = inputstreamref.read()!=-1) {    // } 

inputstreamref inputstream subclass object.

inputstreamref.read() - reads file, , returns -1 when end of file has been reached.

while (symbol != -1) means end of file has not been reached , need continue reading file contents.

---

update

according code you've posted, check comments:

// initializing reader file filereader inone = new filereader("myfile.txt");  // reading first byte 't' variable int t=inone.read();  // if file empty, 't' contain -1 // , loop won't start while (t!=-1) {    // if t not contain -1, end of file not reached    // printing byte    system.out.print((char)t);     // reading next byte    t=inone.read(); }