package com.test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
public class test {
public static void main(String[] args){
String s = new String();
String s1 = new String();
try {
File f = new File("E://123.txt");
if(f.exists()){
System.out.print("文件存在");
}else{
System.out.print("文件不存在");
f.createNewFile();// 不存在則創建
}
BufferedReader input = new BufferedReader(new FileReader(f));
while((s = input.readLine())!=null){
s1 += s+"/n";
}
System.out.println(s1);
input.close();
s1 += "添加的內容!";
BufferedWriter output = new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}