くえびこwiki

import java.io.FileReader;
 
String filename = "c:\\hoge.txt"
FileReader reader = new FileReader(filename);
 
char c = (char)reader.read();  // 1文字読み込み
 
reader.close();

import java.io.FileWriter;
 
String filename="c:\\hoge.txt"
FileWriter writer = new FileWriter(filename);
 
writer.write('あ');
 
writer.close();