Java报错Error occurred during initialization of boot layer怎么办

Question

运行报错，这为啥呀，弄好几个小时了/(ㄒoㄒ)/~~
代码：

package test0420;

abstract class Person {
    protected String name;
    protected String sex;
    protected String birth;
    public Person() {}
    public Person(String name,String sex,String birth) {
        this.name=name;
        this.sex=sex;
        this.birth=birth;
        }
    public String toString() {
        return "姓名:"+name+"，性别："+sex+",出生日期："+birth;
    }
    }
class Teacher extends Person{
    private String school;
    private String kind;
    public Teacher(String name,String sex,String birth,String school,String kind) {
        super(name,sex,birth);
        this.school=school;
        this.kind=kind;
    }
    public String toString() {
        return super.toString()+"，任课学校："+school+"，类别："+kind;
    }
}
abstract class Student extends Person{
    protected String school;
    protected int sno;
    protected String grade;
    public Student () {}
    public Student (String name,String sex,String birth,String school,int sno,String grade) {
        super(name,sex,birth);
        this.school=school;
        this.sno=sno;
        this.grade=grade;
    }
    public String toString() {
        return super.toString()+"，学校"+school+"，学号："+sno+"，年级："+grade;
    }
}
class College extends Student{
    private String major;
    public College() {}
    public College(String name,String sex,String birth,String school,int sno,String grade,String major) {
        super(name,sex,birth,school,sno,grade);
        this.major=major;
    }
    public String toString() {
        return super.toString()+"，专业："+major;
    }
}
class Middle extends Student{
    public Middle() {}
    public Middle(String name,String sex,String birth,String school,int sno,String grade) {
        super(name,sex,birth,school,sno,grade);
    }
    public String toString() {
    return super.toString();
}
class Primary extends Student{
    public Primary() {}
    public Primary(String name,String sex,String birth,String school,int sno,String grade) {
        super(name,sex,birth,school,sno,grade);
        this.school=school;
        
    }
    public String toString() {
    return super.toString();
    }
}
public class Test{
    public void main(String[] args) {
    Teacher t[]=new Teacher[2];
    t[0]= new Teacher("王老师", "女", "1991年5月3日", "南昌交通学院", "大学");
    t[2]= new Teacher("李老师", "男", "1981年8月5日", "实验小学", "小学");
    System.out.println(t.toString());
    College c[]=new College[3];
    c[0]= new College("张三", "男","2003年7月9日", "南昌大学",001, "大二", "计算机");
    c[1]= new College("李四", "男","2001年6月12日", "南昌交通学院",045, "大四", "软件工程");
    c[2]= new College("黄玲", "女","2003年12月4日", "厦门大学",076, "大一", "英语");
    System.out.println(c.toString());
    Middle m[]=new Middle[3];
    m[0]= new Middle("李华", "女","2004年11月8日", "永新中学",024, "高三");
    m[1]= new Middle("尹龙", "男","2003年6月15日", "永新二中",024, "高二");
    m[2]= new Middle("陈萧", "男","2003年3月6日", "禾川中学",024, "高一");
    System.out.println(m.toString());
    Primary p[]=new Primary[3];
    p[0]= new Primary("黄栗","女","2012年6月30日","城厢小学",034,"三年级");
    p[1]= new Primary("陈泽","男","2010年5月18日","城南小学",024,"一年级");
    System.out.println(p.toString());
    }
}

报错：

Answer 1

• Test 类 和 Primary 要独立出来，跟其他类平级，你都写到 Middle 类里了
• 另外Test类中 的 main 方法 没有用 static 修饰，它是无法运行的
• Teather数组 ，访问 t[2] 肯定会数组越界的
• 直接打印 数组，不能调用 数组元素的toString方法，你要换成 Arrays.toString
• 帮你修改如下：

package test0420;
import java.util.Arrays;

/**
 * @author huazie
 * @version 2.0.0
 * @since 2.0.0
 */

abstract class Person {
    protected String name;
    protected String sex;
    protected String birth;

    public Person() {
    }

    public Person(String name, String sex, String birth) {
        this.name = name;
        this.sex = sex;
        this.birth = birth;
    }

    public String toString() {
        return "姓名:" + name + "，性别：" + sex + ",出生日期：" + birth;
    }
}

class Teacher extends Person {
    private String school;
    private String kind;

    public Teacher(String name, String sex, String birth, String school, String kind) {
        super(name, sex, birth);
        this.school = school;
        this.kind = kind;
    }

    public String toString() {
        return super.toString() + "，任课学校：" + school + "，类别：" + kind;
    }
}

abstract class Student extends Person {
    protected String school;
    protected int sno;
    protected String grade;

    public Student() {
    }

    public Student(String name, String sex, String birth, String school, int sno, String grade) {
        super(name, sex, birth);
        this.school = school;
        this.sno = sno;
        this.grade = grade;
    }

    public String toString() {
        return super.toString() + "，学校" + school + "，学号：" + sno + "，年级：" + grade;
    }
}

class College extends Student {
    private String major;

    public College() {
    }

    public College(String name, String sex, String birth, String school, int sno, String grade, String major) {
        super(name, sex, birth, school, sno, grade);
        this.major = major;
    }

    public String toString() {
        return super.toString() + "，专业：" + major;
    }
}

class Middle extends Student {
    public Middle() {
    }

    public Middle(String name, String sex, String birth, String school, int sno, String grade) {
        super(name, sex, birth, school, sno, grade);
    }

    public String toString() {
        return super.toString();
    }
}

class Primary extends Student {
    public Primary() {
    }

    public Primary(String name, String sex, String birth, String school, int sno, String grade) {
        super(name, sex, birth, school, sno, grade);
        this.school = school;

    }

    public String toString() {
        return super.toString();
    }
}

public class Test {
    public static void main(String[] args) {
        Teacher t[] = new Teacher[2];
        t[0] = new Teacher("王老师", "女", "1991年5月3日", "南昌交通学院", "大学");
        t[1] = new Teacher("李老师", "男", "1981年8月5日", "实验小学", "小学");
        System.out.println(Arrays.toString(t));
        College c[] = new College[3];
        c[0] = new College("张三", "男", "2003年7月9日", "南昌大学", 001, "大二", "计算机");
        c[1] = new College("李四", "男", "2001年6月12日", "南昌交通学院", 045, "大四", "软件工程");
        c[2] = new College("黄玲", "女", "2003年12月4日", "厦门大学", 076, "大一", "英语");
        System.out.println(Arrays.toString(c));
        Middle m[] = new Middle[3];
        m[0] = new Middle("李华", "女", "2004年11月8日", "永新中学", 024, "高三");
        m[1] = new Middle("尹龙", "男", "2003年6月15日", "永新二中", 024, "高二");
        m[2] = new Middle("陈萧", "男", "2003年3月6日", "禾川中学", 024, "高一");
        System.out.println(Arrays.toString(m));
        Primary p[] = new Primary[3];
        p[0] = new Primary("黄栗", "女", "2012年6月30日", "城厢小学", 034, "三年级");
        p[1] = new Primary("陈泽", "男", "2010年5月18日", "城南小学", 024, "一年级");
        System.out.println(Arrays.toString(p));
    }
}