Java无法实例化类型Module（非抽象类）

时间：2014-02-24 21:55:11

标签： java compiler-construction

我在编译代码时遇到问题。 eclipse给了我这个错误代码：

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
Cannot instantiate the type Module
Cannot instantiate the type Module

at Model.AddModule(Model.java:214)
at Model.loadFromTextFiles(Model.java:129)
at Model.menu(Model.java:98)
at Run.main(Run.java:7)

这是我的型号代码：

import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.*;
import java.util.*;

import com.sun.xml.internal.ws.api.server.Module;

public class Model implements java.io.Serializable {

private Student[] StudentList = new Student[0];
private Module[] ModuleList  = new Module[0];

public void runTests() throws FileNotFoundException {
    Scanner scan=new Scanner (System.in);
    System.out.println("Loading From text files");
    scan.nextLine();
    loadFromTextFiles();
    printReport();
    System.out.println("Saving serializable");
    scan.nextLine();
    saveSer();
    System.out.println("Creating a new module(CS12330)");
    scan.nextLine();
    String[] temp=new String[0];
    AddModule("CS12330",temp);
    printReport();
    System.out.println("Loading from serialixed file");
    scan.nextLine();
    loadSer();
    printReport();
    System.out.println("Saving using XML");
    scan.nextLine();
    saveXML();
    System.out.println("Creating a new module(CS15560)");
    scan.nextLine();
    AddModule("CS15560",temp);
    printReport();
    System.out.println("Loading from XML file");
    scan.nextLine();
    loadXML();
    printReport();
}

public void menu() throws FileNotFoundException {
    while (true) {
        System.out.println("Menu");
        System.out.println("1-Run Tests");
        System.out.println("2-Add Student");
        System.out.println("4-Add Module");
        System.out.println("5-Add A Student To Module");
        System.out.println("6-Save (Text File)");
        System.out.println("7-Save (Serialization)");
        System.out.println("8-Save (XML)");
        System.out.println("9-Load (Text File)");
        System.out.println("10-Load (Serialization)");
        System.out.println("11-Load (XML)");

        Scanner scan=new Scanner (System.in);
        String response=scan.nextLine();
        if (response.equals("1")){
            runTests();
        } else if (response.equals("2")) {
            System.out.print("Enter UID: ");
            String UID=scan.nextLine();
            System.out.print("Enter Surname: ");
            String surname=scan.nextLine();
            System.out.print("Enter First Name: ");
            String firstname=scan.nextLine();
            System.out.print("Course Code: ");
            String courseCode=scan.nextLine();
            AddStudent(UID,surname,firstname,courseCode);
        } else if (response.equals("4")) {
            System.out.print("Enter Module Code: ");
            String moduleCode=scan.nextLine();
            String[] temp=new String[0];
            AddModule(moduleCode,temp);
        } else if (response.equals("5")) {
            System.out.print("Enter Module Code: ");
            String moduleCode=scan.nextLine();
            Module m=findAModule(moduleCode);
            scan.nextLine();
            if(m!=null){
                System.out.print("Enter UID: ");
                String UID=scan.nextLine();
                Student s=findAStudent(UID);
                if (s!=null) {
                    //m.addThisStudent(s);
                }else System.out.println("Student Not Found");
            }else System.out.println("Module Not Found");

        } else if (response.equals("6")) {
            saveToTextFiles();
        } else if (response.equals("7")) {
            saveSer();
        } else if (response.equals("8")) {
            saveXML();
        } else if (response.equals("9")) {
            loadFromTextFiles();
        } else if (response.equals("10")) {
            loadSer();
        } else if (response.equals("11")) {
            loadXML();
        }
    }
}

public void loadFromTextFiles() throws FileNotFoundException {
    Scanner infile=new Scanner(new InputStreamReader(new FileInputStream("students.txt")));
    int num=infile.nextInt();infile.nextLine();
    for (int i=0;i<num;i++) {
        String u=infile.nextLine();
        String sn=infile.nextLine();
        String fn=infile.nextLine();
        String c=infile.nextLine();
        AddStudent(u,sn,fn,c);
    }
    infile.close();

        infile=new Scanner(new InputStreamReader(new FileInputStream("modules.txt")));
        num=infile.nextInt();infile.nextLine();
        for (int i=0;i<num;i++) {
            String c=infile.nextLine();
            int numOfStudents=infile.nextInt();infile.nextLine();
            String[] students = new String[numOfStudents];
            for (int j=0;j<numOfStudents;j++) {
                students[j] = infile.nextLine();
            }

            AddModule(c,students);
        }
        infile.close();
    }
public void saveToTextFiles() {
    try {
        PrintWriter outfile = new PrintWriter(new OutputStreamWriter (new FileOutputStream("Students.txt")));
        outfile.println(StudentList.length);
        for(int i=0;i<StudentList.length;i++) {
            outfile.println(StudentList[i].getUID());
            outfile.println(StudentList[i].getSName());
            outfile.println(StudentList[i].getFName());
            outfile.println(StudentList[i].getDegree());
        }
        outfile.close();

        outfile = new PrintWriter(new OutputStreamWriter (new FileOutputStream("Modules.txt")));
        outfile.println(ModuleList.length);
        for(int i=0;i<ModuleList.length;i++) {
            outfile.println(ModuleList[i].getCode());
            outfile.println(ModuleList[i].getStudents().length);
            for (int j=0;j<(ModuleList[i]).getStudents().length;j++) {
                outfile.println(ModuleList[i].getStudents()[j]);
            }
        }
        outfile.close();
    }
    catch(IOException e) {
    }
}

public void loadSer() {
    Model m =null;
    try{
        FileInputStream fileIn = new FileInputStream("Model.ser");
        ObjectInputStream in = new ObjectInputStream(fileIn);
        m=(Model) in.readObject();
        in.close();
        fileIn.close();
    }catch (Exception e){}
    if (m!=null) {
        setStudentList(m.getStudentList());
        setModuleList(m.getModuleList());
    }
}

public void saveSer() {
try {
    FileOutputStream fileOut = new FileOutputStream("Model.ser");
    ObjectOutputStream out = new ObjectOutputStream(fileOut);
    out.writeObject(this);
    out.close();
    fileOut.close();
} catch(IOException e) {}
}

public void loadXML() {
    try {
        Model m = null;
        XMLDecoder decoder = new XMLDecoder (new BufferedInputStream (new FileInputStream("model.xml")));
        m = (Model) decoder.readObject();
        decoder.close();
        setStudentList(m.getStudentList());
        setModuleList(m.getModuleList());
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void saveXML() {
    try {
        Model m = null;
        XMLEncoder encoder = new XMLEncoder (new BufferedOutputStream (new FileOutputStream("model.xml")));
        encoder.writeObject(this);
        encoder.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void AddModule(String c, String[] students) {
    int length = ModuleList.length;
    Module NewArray[]=new Module[length+1];
    for (int i=0;i<length+1;i++) {
        if (i<length) {
            NewArray[i]=new Module(ModuleList[i]);
        }
    }
    NewArray[length]=new Module(c, students);
    ModuleList = NewArray.clone();


}
private void AddStudent(String u, String sn, String fn, String c) {
    int length = StudentList.length;
    Student NewArray[]=new Student[StudentList.length+1];
    for (int i=0;i<StudentList.length+1;i++) {
        if (i<length) {
            NewArray[i]=new Student(StudentList[i]);
        }
    }
    NewArray[length]=new Student(u,sn,fn,c);
    StudentList = NewArray.clone();

}
public void printReport() {
    for (int i= 0;i<ModuleList.length;i++) {
        System.out.println(ModuleList[i].toString(this));
    }
}
public Student findAStudent(String UID) {
    for(int i=0;i<StudentList.length;i++) {
        if (StudentList[i].getUID().compareTo(UID)==0) {
            return StudentList[i];
        }
    }
    return null;
}
public Module findAModule(String moduleCode) {
    for(int i=0;i<ModuleList.length;i++) {
        if (ModuleList[i].getCode().compareTo(moduleCode)==0) {
            return ModuleList[i];
        }
    }
    return null;

}

public Module[] getModuleList() {
    return ModuleList;
}

public Student[] getStudentList() {
    return StudentList;
}

public void setModuleList(Module[] m) {
    ModuleList=m.clone();
}

public void setStudentList(Student[] s) {
    StudentList=s.clone();
}
}

这是我的模块代码：

public class Module{

private String Code;
private String[] students = new String[0];

public Module (){};

public Module(String c, String[] s) {
    Code=c;
    students=s;
}
public Module(Module module) {
    Code=module.getCode();
    students=module.getStudents();
}
public String[] getStudents() {
    return students;
}
public String getCode() {
    return Code;
}
public void addThisStudent(Student s) {
    AddStudent(s.getUID());
}

public String toString(Model mod) {
    String studentString ="";
    if (students.length == 0) {
        studentString = "\n   No Students";
    }else {
        for (int i=0;i<students.length;i++) {
            Student s = mod.findAStudent(students[i]);
            if (s!=null) {
                studentString += "\n   "+s.toString();
            }
        }
    }
    return Code + studentString;
}
private void AddStudent(String UIDToAdd) {
    int length = students.length;
    String NewArray[]=new String[students.length+1];
    for (int i=0;i<length;i++) {
        NewArray[i] = students[i];
    }
    NewArray[length] = UIDToAdd;
    students = NewArray.clone();
}
}

老实说，我不知道为什么会这样。我之前用Google搜索了我的错误，我只发现了涉及抽象类的问题。

2 个答案:

答案 0 :(得分：1)

您导入了错误的模块 - 您正在导入：

import com.sun.xml.internal.ws.api.server.Module;

您需要导入自己的模块。

答案 1 :(得分：0)

这是因为您在Model类中导入了“com.sun.xml.internal.ws.api.server.Module”。尝试取出并输入你的.package.Module。

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