Why do I get Chinese characters when generating random numbers in Java?

This program generates 50 random numbers between 1 to 100 and the output are written in the fileresult.txt .

    FileWriter outputChar = new FileWriter(new File ("fileresult.txt"));
    Random random = new Random();
    for(int i = 1 ; i <= 50 ; i++){
        int min = 1;
        int max = 100;
        int number = random.nextInt(max - min + 1) + min;
        outputChar.write(number);
    }
    outputChar.close();

The problem is the output are not integer values, but many Chinese characters instead. Why does this happen?