突合処理用のラッパー群；普通に書くのが面倒なので

BRIterator.java

import java.io.BufferedReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class BRIterator implements Iterator<String> {
    private final BufferedReader br;

    public BRIterator(BufferedReader bufferedReader) {
        br = bufferedReader;
    }

    @Override
    public String next() {
        try {
            if(hasNext()) { return br.readLine(); }
        }
        catch(IOException e) {}

        throw new NoSuchElementException();
    }
    @Override
    public boolean hasNext() {
        try {
            return br.ready();
        }
        catch(IOException e) {
            return false;
        }
    }
}

EOFWrapper.java

import java.util.Iterator;
import java.util.NoSuchElementException;

public class EOFWrapper<T> {
    private final Iterator<T> it;
    public EOFWrapper(Iterator<T> it) {
        this.it = it;
        this.isEOF = !it.hasNext();
    }

    //
    private boolean isEOF;
    public boolean isEOF() { return isEOF; }

    public T next() {
        try {
            return it.next();
        }
        catch(NoSuchElementException e) {
            isEOF = true;
            return null;
        }
    }
}