英文:
How to swap the first word with the last word in the file in Java?
问题
我正在尝试将第一个单词移到Java中的最后一个位置。我可能遗漏了什么吗？
没有将第一个单词更改为最后一个单词，并且不确定是否然后将字符串再次添加到文件中。
public class WorkString {
public WorkString() {
this.reader = new BufferedReader(new InputStreamReader(System.in));
}
public void swapWords() throws IOException {
System.out.println("输入文件名：");
filename = reader.readLine();
fio = new RandomAccessFile(new File(filename), "r");
data = fio.readLine();
System.out.println("来自文件的信息：" + data);
String content = fio.toString();
System.out.println(content);
String[] ori = content.split(" ");
String str = "";
String temp = ori[0];
ori[0] = ori[ori.length - 1];
ori[ori.length - 1] = temp;
for (int i = 1; i < ori.length; i++)
str += ori[i];
fio.writeBytes(str + ori[0]); // 我可以这样做吗？
fio.close();
}
}
英文:
I am trying to move the first word to the last position in Java.What could I be missing?
Doesn't change the first word to the last one and is not sure that then the String is added to the file again.
public class WorkString {
public WorkString() {
this.reader = new BufferedReader(new InputStreamReader(System.in));
}
public void swapWords() throws IOException {
System.out.println("Enter file name : ");
filename = reader.readLine();
fio = new RandomAccessFile(new File(filename), "r");
data = fio.readLine();
System.out.println("Information from file : " + data);
String content = fio.toString();
System.out.println(content);
String[] ori = content.split(" ");
String str = "";
String temp=ori[0];
ori[0]=ori[ori.length-1];
ori[ori.length-1]=temp;
for(int i = 1; i < ori.length; i++)
str += ori[i];
fio.writeBytes(str + ori[0]); // Can I do this?
fio.close();
}
}
答案1
得分: 0
public void swapWords() throws Exception {
System.out.println("输入文件名 : ");
String filename = reader.readLine();
RandomAccessFile fio = new RandomAccessFile(new File(filename), "rw");
String data = fio.readLine();
System.out.println("文件中的信息 : " + data);
String content = data;
System.out.println(content);
String[] ori = content.split(" ");
String str = "";
String temp = ori[0];
ori[0] = ori[ori.length - 1];
ori[ori.length - 1] = temp;
str = String.join(" ", ori);
fio.write(str.getBytes(StandardCharsets.UTF_8));
fio.close();
}
英文:
public void swapWords() throws Exception {
System.out.println("Enter file name : ");
String filename = reader.readLine();
RandomAccessFile fio = new RandomAccessFile(new File(filename), "rw");
String data = fio.readLine();
System.out.println("Information from file : " + data);
String content = data;
System.out.println(content);
String[] ori = content.split(" ");
String str = "";
String temp=ori[0];
ori[0]=ori[ori.length-1];
ori[ori.length-1]=temp;
str = String.join(" ", ori);
fio.write(str.getBytes(StandardCharsets.UTF_8));
fio.close();
}
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