在Linux和Java中对记录进行排序，但将标题保留在顶部

标题1,内容1
标题2,内容2
标题3,内容3

sort -k1,1 data.txt

标题1,内容1
标题2,内容2
标题3,内容3

public class Record implements Comparable<Record> {
    private String title;
    private String content;

    public Record(String title, String content) {
        this.title = title;
        this.content = content;
    }

    public String getTitle() {
        return title;
    }

    public String getContent() {
        return content;
    }

    @Override
    public int compareTo(Record other) {
        return this.title.compareTo(other.title);
    }
}

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        List<Record> records = new ArrayList<>();
        records.add(new Record("标题3", "内容3"));
        records.add(new Record("标题1", "内容1"));
        records.add(new Record("标题2", "内容2"));

        Collections.sort(records);

        for (Record record : records) {
            System.out.println(record.getTitle() + "," + record.getContent());
        }
    }
}

标题1,内容1
标题2,内容2
标题3,内容3