educoder实验六第二题

public class Student {
    public char[] name = {'\u0000','\u0000','\u0000','\u0000','\u0000','\u0000','\u0000','\u0000','\u0000','\u0000'};
    public int age;

    public Student() {
    }

    public Student(String name, int age) {
        if (name.length() > 10) {
            System.arraycopy(name.toCharArray(), 0, this.name, 0, 10);
        } else {
            System.arraycopy(name.toCharArray(), 0, this.name, 0, name.toCharArray().length);
        }
        this.age = age;
    }

    public void Print() {
        System.out.println(String.valueOf(name) + " " + age );
    }

    @Override
    public String toString() {
        return String.valueOf(name) + " " + age ;
    }

}

public class RWClass {
    private String filename;

    public RWClass(String filename) {
        this.filename = filename;
    }

    public void saveStudent(Student student, int pos) throws Exception {
        RandomAccessFile rw = null;
        rw = new RandomAccessFile(filename, "rw");
        rw.seek(pos * 28);
        for (int i = 0; i < 10; i++) {
            rw.writeChar(student.name[i]);
        }
        rw.writeInt(student.age);
        rw.close();
    }

    public Student readStudent(int pos) throws Exception {
        char[] read = new char[10];
        RandomAccessFile r = new RandomAccessFile(filename, "r");
        r.seek(pos * 28);
        for (int i = 0; i < 10; i++) {
            read[i] = r.readChar();
        }
        int age = r.readInt();
        return new Student(read.toString(),age);
    }
}

本文地址：https://blog.csdn.net/qq_46197019/article/details/110292883