代码的目的是为了通过输入五组学生数据，进行储存并且遍历显示，一下是源代码
分别在第二个和第三个类文件中调用Student类成员时报错，显示缺少方法
//第一个类文件
package StudentInfor;
import java.io.*;
public class Student implements Serializable {
private String id; //学号
private String name; //姓名
private int eng; //英语成绩
private int math; //数学成绩
private int comp; //计算机成绩
private int sum; //总成绩
public Student(String id,String name, int eng, int math,int comp){//生成构造函数
this.id=id;
this.name=name;
this.eng=eng;
this.math=math;
this.comp=comp;
sum(); //计算总成绩
}
public static Student getAStudent(int i){
Student studenti;
System.out.println("输入第" + i + "个学生的信息:");
System.out.print("学号:");
String id = Keyboard.getString();
System.out.print("姓名:");
String name = Keyboard.getString();
System.out.print("英语成绩:");
int eng = Keyboard.getInteger();
System.out.print("数学成绩:");
int math = Keyboard.getInteger();
System.out.print("计算机成绩:");
int comp = Keyboard.getInteger();
studenti = new Student(id,name,eng,math,comp);
return studenti;
}
public void setId(String id){
this.id=id;
}
public void setName(String name)
{
this.name=name;
}
public void setEng(int eng)
{
this.eng=eng;
sum(); //计算总成绩
}
public void setMath(int math)
{
this.math=math;
sum(); //计算总成绩
}
public void setComp(int comp){
this.comp=comp;
sum(); //计算总成绩
}
public String getId(){//读取成员变量并转换为字符串返回
return id;
}
public String getName(){
return name;
}
public int getEng(){ return eng; }
public int getMath(){ return math; }
public int getComp(){ return comp; }
public int getSum(){ return sum; }
final void sum(){
sum=eng+math+comp;
}
public String toString(){
return getId() + "\t"+getName() +"\t"+getEng() + "\t"+getMath() +"\t"+getComp() +"\t"+getSum();
}
public boolean equals(Object x) {
if (this.getClass() != x.getClass()) return false;
Student b = (Student) x;
return (this.getId().equals(b.getId()));
}
//比较成绩大小,当前对象成绩比参数对象成绩大时返回1,相等时返回0,其它返回-1.
public int compare(Student A){
if(this.getSum()>A.getSum()) return 1;
else if(this.getSum()==A.getSum()) return 0;
else return -1;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}
//第二个类文件
package StudentInfor;
import java.io.*;
public class StudentClass{
private String name; //班级名称
static int capacity = 40; //最大容量
private Student students[]; //学生
private int size; //实际人数
public StudentClass(String name, int size){
this.name = name;
this.size = size;
students = new Student[capacity];
}
public String getName(){ return name; }
public int getCapacity(){ return capacity; }
public Student[] getStudents(){ return students; }
public int getSize(){ return size; }
public void setName(String name){ this.name =name;}
public void setCapacity(int capacity)
{
this.capacity = capacity;
}
public void setSize(int size){
this.size = size;
}
public void setStudents(Student[] students){
for (int i = 0; i<size; i++)
this.students[i] = new Student(students[i]);//报错-----------------------------------------------------
}
public String toString(){
String s;
s = " 班级:" + name +"\t" + "容量:" + capacity + "\t" + "实际人数:" + size +"\n\n";
s = s + "学号"+"\t" + "姓名"+"\t" + "英语"+"\t" + "数学" + "\t" + "计算机" +"\t" + "总成绩\n"; for (int i=0; i<size; i++)
s = s + students[i].getId()+"\t"+ students[i].getName()+ "\t" +students[i].getEng()+ "\t" +students[i].getMath()+"\t"+
students[i].getComp()+"\t"+students[i].getSum()+"\n";
return s;
}
}
//第三个类
package StudentInfor;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
public class Tester1{
public static void main(String args[]){
StudentClass aClass = new StudentClass("信管",5); Student students[]=new Student[5];
for (int i=0; i<5; i++)
students[i] = new Student(getAStudent(i+1)); //报错------------
aClass.setStudents(students);
System.out.println(aClass);
try {
ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream ("D:\\java学习\\java junk\\StudentInfor\\src\\StudentInfor\\student.ser"));
for (int i=0; i<5; i++)
oos.writeObject(students[i]);
oos.close();
}catch(Exception e){
System.out.println(e) ;
}
}
public static Student getAStudent(int i){
Student studenti;
System.out.println("输入第" + i + "个学生的信息:");
System.out.print("学号:");
String id = Keyboard.getString();
System.out.print("姓名:");
String name = Keyboard.getString();
System.out.print("英语成绩:");
int eng = Keyboard.getInteger();
System.out.print("数学成绩:");
int math = Keyboard.getInteger();
System.out.print("计算机成绩:");
int comp = Keyboard.getInteger();
studenti = new Student(id,name,eng,math,comp);
return studenti;
}
}
//第四个类
package StudentInfor;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Keyboard{
static BufferedReader inputStream = new BufferedReader (new InputStreamReader(System.in));
public static int getInteger(){
try {
return (Integer.valueOf(inputStream.readLine().trim()).intValue());
}catch(Exception e){
e.printStackTrace();
return 0;
}
}
public static String getString() {
try{
return (inputStream.readLine());
}catch (IOException e){
return "0";
}
}
}
