BufferedWriter

import

import java.io.BufferedWriter;
import java.io.OutputStreamWriter;

create

BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));

append

int aaa = 333;
bfw.append(String.valueOf(aaa);

example

import java.io.BufferedWriter;
import java.io.OutputStreamWriter;

public static void main (String args[]) throws Exception {
    private static int N = 0;

    BufferedWriter bfw = new BufferedWriter(new OutputStreamWriter(System.out));

    bfw.append(String.valueOf(N));
    bfw.append("\n);

    bfw.flush();
    bfw.close();
}