如何修复这个java.io.NotSerializableException:java中的错误?

Question

我对java很陌生，不确定如何修复这个java.io.NotSerializableException错误。

我正在尝试使用 GUI 上的添加按钮将对象添加到数组列表 然后将该对象写入文件，以便我能够读回它。

这是我用于实现 JavaSerializable的Branch类的代码：

import java.io.Serializable;
public class Branch implements Serializable{
private String branch_name;
private String branch_address;
public Branch(String Bname, String Baddress) {
this.branch_name = Bname;
this.branch_address = Baddress;
public String getbranch_name(){
return branch_name;
}
public String getbranch_address(){
return branch_address;
}
public void show_branch_details() {
System.out.println( " The branch name is : " + getbranch_name()
+ " branch address :"+ getbranch_address()
}
}
}

以下是添加按钮的代码：

ArrayList<Branch> BranchList = new ArrayList<Branch>();
JButton AddBranch = new JButton("ADD BRANCH");
AddBranch.setBounds(10, 35, 161, 23);
AddBranch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String Bname = branchNameField.getText();
String Baddress = branchAddressField.getText();
Branch A = new Branch(Bname, Baddress);
BranchList.add(A);
for (int i = 0; i < BranchList.size(); i++) {
displayInfo.append(BranchList.get(i).getbranch_name() +);
}
System.out.println("The ArrayList has " + BranchList.size());
for (int i = 0; i < BranchList.size(); i++) {
System.out.println(BranchList.get(i).getbranch_name());
}
try {
FileOutputStream fos = new FileOutputStream("branch.dat");
ObjectOutputStream oos = new ObjectOutputStream(fos);
//oos.writeObject(BranchList);
for (int b = 0; b < BranchList.size(); b++) {
oos.writeObject(BranchList.get(b));
}
oos.flush();
oos.close();
FileInputStream fis = new FileInputStream("branch.dat");
ObjectInputStream ois = new ObjectInputStream(fis);
//BranchList = (ArrayList<Branch>)ois.readObject();
Branch obj = null;
while ((obj = (Branch) ois.readObject()) != null) {
System.out.println("Name:" + obj.getbranch_name() + ", Address:"
+ obj.getbranch_address());
}
ois.close();
} catch (IOException ex) {
System.out.println(" IOE ERROR");
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
System.out.println("class ERROR");
ex.printStackTrace();
}
}
});

Answer 1

请将其用作分支类：

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
class Branch implements Serializable{
private String branch_name;
private String branch_address;
public Branch(String Bname, String Baddress) {
this.branch_name = Bname;
this.branch_address = Baddress;
}
public String getbranch_name(){
return branch_name;
}
public String getbranch_address(){
return branch_address;
}
public void show_branch_details() {
System.out.println( " The branch name is : " + getbranch_name()
+ " branch address :"+ getbranch_address());
}
}
public class Test {
public static void main(String[] args) throws IOException, ClassNotFoundException {
Branch A= new Branch("TestA","Add_A");
Branch B= new Branch("TestB","Add_B");
ArrayList<Branch> BranchList = new ArrayList<>();
BranchList.add(A);
BranchList.add(B);
FileOutputStream fos = new FileOutputStream("branch.dat");
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(BranchList);
oos.flush();
oos.close();
ArrayList<Branch> OutputBranchList = new ArrayList<>();
FileInputStream fis = new FileInputStream("branch.dat");
ObjectInputStream ois = new ObjectInputStream(fis);
OutputBranchList = (ArrayList) ois.readObject();
for(Branch branch : OutputBranchList) {
System.out.println(branch.getbranch_name()+" "+ branch.getbranch_address());
}
ois.close();
}
}