如何使用Java中的BufferedReader读取文件结尾（EOF）？

Question

I have problem with reading the input until EOF in Java . In here, there are single input and the output consider the input each line.

Example:

input:

1
2
3
4
5

output:

0 
1
0
1
0

But, I have coded using Java, the single output will printed when I was entering two numbers. I want single input and print single output each line (terminate EOF ) using BufferedReader in Java.

This is my code:

BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
StringBuffer pr = new StringBuffer("");

String str = "";
while((str=input.readLine())!=null && str.length()!=0) {
    BigInteger n = new BigInteger(input.readLine());
}

Answer 1

You are consuming a line at, which is discarded

while((str=input.readLine())!=null && str.length()!=0)

and reading a bigint at

BigInteger n = new BigInteger(input.readLine());

so try getting the bigint from string which is read as

BigInteger n = new BigInteger(str);

   Constructor used: BigInteger(String val)

Aslo change while((str=input.readLine())!=null && str.length()!=0) to

while((str=input.readLine())!=null)

see related post string to bigint

readLine()
Returns:
    A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached 

see javadocs

Answer 2

With text files, maybe the EOF is -1 when using BufferReader.read(), char by char. I made a test with BufferReader.readLine()!=null and it worked properly.