您执行删除和添加的代码（包括加载和保存文件的逻辑）丢失或不完整。看起来你正在尝试做的事情实际上很容易。
不知道您的具体要求enter code here是什么，我无法一针见血。但是，这是一个完整的示例类，我用 Groovy 编写（非常接近 Java - 但更好），它完成了我“认为”你想要完成的事情。如果这对您有帮助，请将此示例标记为明确的答案。
随意运行下面的 Groovy 类并尝试一下。
import groovy.transform.Canonical
import javax.swing.*
public class AddressBook {
List<Address> addressBook = new ArrayList<>();
String filePath;
public String deleteAddress(String firstName, String lastName) {
String result = "Not Found"
Iterator<Address> iter = addressBook.iterator();
while(iter.hasNext()){
Address addy = iter.next();
if ((addy.getFirstName().equalsIgnoreCase(firstName)) && (addy.getLastName().equalsIgnoreCase(lastName))) {
iter.remove();
result = "Address was found and removed..save to update the file.";
}
}
println result;
return result;
}
void addAddress(String firstName, String lastName, String addyString){
addressBook.add(new Address("firstName":firstName, "lastName":lastName, "address":addyString));
println "Address added..save to update the file.";
}
void saveAddressBookToFile() throws IOException{
BufferedWriter bw = null;
println "Saving addresses to file: " + filePath;
try{
File file = new File(filePath);
bw = new BufferedWriter(new FileWriter(file));
file.createNewFile()
for(Address addy: addressBook){
bw.write(addy.toString() + "\n");
}
bw.flush();
}
finally{
if(bw){
bw.close();
}
}
}
void loadAddressBook(String path) throws IOException{
addressBook.clear();
filePath = path;
BufferedReader br = null;
try{
List<String> lines = new BufferedReader(new FileReader(path)).readLines();
for(String line: lines){
addressBook.add(new Address(line));
}
println path + " loaded successfully."
}
catch(FileNotFoundException fnfe){
println "File " + path + " does not exist, nothing loaded.";
}
finally {
if (br) {
br.close()
}
}
}
void printLoadedAddresses(){
for(Address addy: addressBook){
println addy.prettyString();
}
}
public static void main(String... args) {
AddressBook ab = new AddressBook();
String readln = ' '
while(readln){
readln = JOptionPane.showInputDialog('Please input a valid command: load, add, delete, save')
if (readln) {
args = readln.split()
switch (args[0]) {
case "load":
if (args.length < 2) {
println("You did not provide the second argument for the address csv file path.")
break;
} else {
ab.loadAddressBook(args[1])
}
break;
case "add":
if(args.length < 4){
println("Please provide the firstName, lastName, and address parameters when adding.")
}
else {
ab.addAddress(args[1], args[2], args[3..-1].join(" "));
}
break;
case "delete":
if(args.length < 3){
println("Please provide the firstName, lastName, and address parameters when deleting.")
}
else {
ab.deleteAddress(args[1], args[2]);
}
break;
case "save":
if (ab.filePath) {
ab.saveAddressBookToFile();
} else {
println("You must first call load with a file path for the csv file (even it it doesn't exist yet.")
}
break;
case "print":
ab.printLoadedAddresses();
break;
case "exit":
System.exit(0)
default:
println "Unrecognized command: " + args[0]
}
}
}
}
}
@Canonical
class Address {
String firstName;
String lastName;
String address;
public Address(){
super
}
public Address(String csvString){
List<String> tokens = csvString.split(",");
firstName = tokens[0];
lastName = tokens[1];
address = tokens[2]
}
@Override
public String toString(){
return firstName + "," + lastName + "," + address;
}
public String prettyString(){
return firstName + " " + lastName + " - " + address;
}
}