请教各位
public class Student {private String name;
private int score;
public Student()
{
setName("noname");
}
public Student(String name,int score)
{
setName(name);
this.score=score;
}
public String getName() {
return name;
}
public void setName(String name) {
StringBuilder builder=null;
if(name!=null)
builder=new StringBuilder(name);
else
builder=new StringBuilder(15);
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
public static int size()
{
return 34;
}
}
import
import
import
import java.util.Scanner;
public class RandomAccessFileDemo {
public static void main(String[] args) {
Student[] students = { new Student("zhangsheng", 90),
new Student("liyuan", 92), new Student("goofy", 90) };
try {
File file = new File(args[0]);
RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");
for (int i = 0; i < students.length; i++) {
randomAccessFile.writeChars(students[i].getName());
randomAccessFile.writeInt(students[i].getScore());
}
Scanner scanner = new Scanner(System.in);
System.out.print("读取第几个数据");
int num = scanner.nextInt();
randomAccessFile.seek((num-1) * Student.size());
Student student = new Student();
student.setName(readName(randomAccessFile));
student.setScore(randomAccessFile.readInt());
System.out.println("姓名：" + student.getName());
System.out.println("分数：" + student.getScore());
randomAccessFile.close();
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("请指定文件名称");
} catch (IOException e) {
e.printStackTrace();
}
}
private static String readName(RandomAccessFile randomAccessFile)
throws IOException {
char[] name = new char[15];
for (int i = 0; i < name.length; i++)
name[i] = randomAccessFile.readChar();
return new String(name).replace('\0', ' ');
}
}
良哥哥的书上的例子，运行怎么就抛出ArrayIndexOutOfBoundsException异常啊？在Eclipse上运行的
