java txt 파일 읽어서 추가로 쓰기 -> 성적처리
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
public class java_성적처리 {
public static void main(String[] args) throws IOException {
BufferedReader in = null;
BufferedWriter out = null;
in = new BufferedReader(new FileReader("sungjuk.txt"));
out = new BufferedWriter(new FileWriter("sungjuk1.txt"));
String line;
while((line = in.readLine()) != null){
String[] tokens = line.split(" ");
int sum = Integer.parseInt(tokens[1]) + Integer.parseInt(tokens[2]) + Integer.parseInt(tokens[3]);
line = line + " " + sum;
out.write(line);
out.newLine();
//System.out.println(line);
}
in.close();
out.close();
}
}

import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
public class java_성적처리 {
public static void main(String[] args) throws IOException {
BufferedReader in = null;
BufferedWriter out = null;
in = new BufferedReader(new FileReader("sungjuk.txt"));
out = new BufferedWriter(new FileWriter("sungjuk1.txt"));
String line;
while((line = in.readLine()) != null){
String[] tokens = line.split(" ");
int sum = Integer.parseInt(tokens[1]) + Integer.parseInt(tokens[2]) + Integer.parseInt(tokens[3]);
line = line + " " + sum;
out.write(line);
out.newLine();
//System.out.println(line);
}
in.close();
out.close();
}
}
결과
이름 점수 점수 점수 형식에서
이름 점수 점수 점수 점수의 합계로
sungjuk.txt -> sungjuk1.txt

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