Question

java 中从控制台输入两个数，并将相加的结果存入一个文本文件中

Answer 1

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.Scanner;

public class Test {
public static void main(String[] args) {

System.out.println("请输入第一个数");
Scanner input = new Scanner(System.in);
int one = input.nextInt();
System.out.println("请输入第二个数");

int two=input.nextInt();

int sum=one+two;
System.out.println(one+"和"+two+"的和为:"+sum);
write("E:\\123.txt", String.valueOf(sum));

}
public static void write(String path, String content) {
String s = new String();
String s1 = new String();
try {
File f = new File(path);
if (f.exists()) {
System.out.println("文件存在");
} else {
System.out.println("文件不存在，正在创建...");
if (f.createNewFile()) {
System.out.println("文件创建成功！");
} else {
System.out.println("文件创建失败！");
}

}
BufferedReader input = new BufferedReader(new FileReader(f));

while ((s = input.readLine()) != null) {
s1 += s + "\n";
}
System.out.println("文件内容：" + s1);
input.close();
s1 += content;

BufferedWriter output = new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

Answer 2

这就是正确的答案？还没有明白你问的什么意思。