Java 如何使调用多个ListIterator更有效?
所以我的问题是,是否有可能通过使用一个带有列表名(foodList、foodAmount等)的数组来简化这段代码,而不是使用列表名(来自所述数组)在迭代器中替换它们的占位符来进行某种循环 代码如下:Java 如何使调用多个ListIterator更有效?,java,Java,所以我的问题是,是否有可能通过使用一个带有列表名(foodList、foodAmount等)的数组来简化这段代码,而不是使用列表名(来自所述数组)在迭代器中替换它们的占位符来进行某种循环 代码如下: public static void writeFile()引发IOException{ ListIterator foodIterator=GrocerieList.foodList.ListIterator(0); ListIterator foodAmountIterator=Grocerie
public static void writeFile()引发IOException{
ListIterator foodIterator=GrocerieList.foodList.ListIterator(0);
ListIterator foodAmountIterator=GrocerieList.foodAmount.ListIterator(0);
ListIterator-drinkIterator=GrocerieList.drinkList.ListIterator(0);
ListIterator-drinkAmountIterator=GrocerieList.drinkAmount.ListIterator(0);
FileWriter=newfilewriter(“/Users/c-mon/IdeaProjects/final/src/shoppingList.txt”);
//食物
作家。写(“食物清单”);
writer.write(System.getProperty(“line.separator”);
if(foodIterator.hasNext()){
做{
write.write(foodIterator.next());
writer.write(System.getProperty(“line.separator”);
}while(foodIterator.hasNext());
}否则{
writer.write(“空”);
writer.write(System.getProperty(“line.separator”);
}
作者:写(“foodAmount”);
writer.write(System.getProperty(“line.separator”);
if(foodAmountIterator.hasNext()){
做{
write(foodAmountIterator.next()+);
writer.write(System.getProperty(“line.separator”);
}while(foodAmountIterator.hasNext());
}否则{
writer.write(“空”);
writer.write(System.getProperty(“line.separator”);
}
//饮料
作家。写作(“饮酒者”);
writer.write(System.getProperty(“line.separator”);
if(drinkIterator.hasNext()){
做{
write.write(drinkIterator.next());
writer.write(System.getProperty(“line.separator”);
}while(drinkIterator.hasNext());
}否则{
writer.write(“空”);
writer.write(System.getProperty(“line.separator”);
}
作家。写作(“drinkAmount”);
writer.write(System.getProperty(“line.separator”);
if(drinkAmountIterator.hasNext()){
做{
write(drinkAmountIterator.next()+);
writer.write(System.getProperty(“line.separator”);
}while(drinkAmountIterator.hasNext());
}否则{
writer.write(“空”);
writer.write(System.getProperty(“line.separator”);
}
writer.close();
}
这是声明列表的地方
import java.util.ArrayList;
import java.util.ListIterator;
public class GrocerieList {
static ArrayList<String> foodList = new ArrayList<>();
static ArrayList<String> hygieneList = new ArrayList<>();
static ArrayList<String> drinkList = new ArrayList<>();
static ArrayList<String> otherList = new ArrayList<>();
static ArrayList<Integer> foodAmount = new ArrayList<>();
static ArrayList<Integer> hygieneAmount = new ArrayList<>();
static ArrayList<Integer> drinkAmount = new ArrayList<>();
static ArrayList<Integer> otherAmount = new ArrayList<>();
public static void foodOutput (){
ListIterator<String> foodListIterator = foodList.listIterator(0);
ListIterator<Integer> foodAmountIterator = foodAmount.listIterator(0);
if(foodListIterator.hasNext()){
System.out.println("\t" + "Food");
do {
System.out.println("\t" + foodAmountIterator.next() + "\t\t" + "\t--\t" + "\t\t" + foodListIterator.next());
}while (foodListIterator.hasNext());
System.out.println(" ");
}else{
System.out.println("\t" + "Food");
System.out.println("\t" + "No food on your list");
System.out.println(" ");
}
}
public static void drinkOutput (){
ListIterator<String> drinkListIterator = drinkList.listIterator(0);
ListIterator<Integer> drinkAmountIterator = drinkAmount.listIterator(0);
if(drinkListIterator.hasNext()){
System.out.println("\t" + "Drinks");
do {
System.out.println("\t" + drinkAmountIterator.next() + "\t\t" + "\t--\t" + "\t\t" + drinkListIterator.next());
}while (drinkListIterator.hasNext());
System.out.println(" ");
}else{
System.out.println("\t" + "Drinks");
System.out.println("\t" + "No drinks on your list");
System.out.println(" ");
}
}
public static void hygieneOutput (){
ListIterator<String> hygieneListIterator = hygieneList.listIterator(0);
ListIterator<Integer> hygieneAmountIterator = hygieneAmount.listIterator(0);
if(hygieneListIterator.hasNext()){
System.out.println("\t" + "Hygiene");
do {
System.out.println("\t" + hygieneAmountIterator.next() + "\t\t" + "\t--\t" + "\t\t" + hygieneListIterator.next());
}while (hygieneListIterator.hasNext());
System.out.println(" ");
}else{
System.out.println("\t" + "Hygiene");
System.out.println("\t" + "No hygiene products on your list");
System.out.println(" ");
}
}
public static void otherOutput (){
ListIterator<String> otherListIterator = otherList.listIterator(0);
ListIterator<Integer> otherAmountIterator = otherAmount.listIterator(0);
if(otherListIterator.hasNext()){
System.out.println("\t" + "Other products");
do {
System.out.println("\t" + otherAmountIterator.next() + "\t\t" + "\t--\t" + "\t\t" + otherListIterator.next());
}while (otherListIterator.hasNext());
System.out.println(" ");
}else{
System.out.println("\t" + "Other Products");
System.out.println("\t" + "No other products on your list");
System.out.println(" ");
}
}
public static void rewe (){
System.out.println("########################################");
System.out.println(" ");
System.out.println("Here is your REWE shopping list!");
System.out.println(" ");
System.out.println("\t" + "Qty" + "\t\t" + "\t--\t" + "\t\t" + "Product");
System.out.println(" ");
foodOutput();
drinkOutput();
hygieneOutput();
otherOutput();
System.out.println(" ");
System.out.println("########################################");
}
public static void lidl (){
System.out.println("########################################");
System.out.println(" ");
System.out.println("Here is your LIDL shopping list!");
System.out.println(" ");
System.out.println("\t" + "Qty" + "\t\t" + "\t--\t" + "\t\t" + "Product");
System.out.println(" ");
drinkOutput();
foodOutput();
otherOutput();
hygieneOutput();
System.out.println(" ");
System.out.println("########################################");
}
public static void edeka (){
System.out.println("########################################");
System.out.println(" ");
System.out.println("Here is your EDEKA shopping list!");
System.out.println(" ");
System.out.println("\t" + "Qty" + "\t\t" + "\t--\t" + "\t\t" + "Product");
System.out.println(" ");
foodOutput();
hygieneOutput();
otherOutput();
drinkOutput();
System.out.println(" ");
System.out.println("########################################");
}
public static void aldi (){
System.out.println("########################################");
System.out.println(" ");
System.out.println("Here is your ALDI shopping list!");
System.out.println(" ");
System.out.println("\t" + "Qty" + "\t\t" + "\t--\t" + "\t\t" + "Product");
System.out.println(" ");
drinkOutput();
foodOutput();
hygieneOutput();
otherOutput();
System.out.println(" ");
System.out.println("########################################");
}
public static void kaufland (){
System.out.println("########################################");
System.out.println(" ");
System.out.println("Here is your KAUFLAND shopping list!");
System.out.println(" ");
System.out.println("\t" + "Qty" + "\t\t" + "\t--\t" + "\t\t" + "Product");
System.out.println(" ");
foodOutput();
otherOutput();
drinkOutput();
hygieneOutput();
System.out.println(" ");
System.out.println("########################################");
}
}
import java.util.ArrayList;
导入java.util.ListIterator;
公营杂货店{
静态ArrayList foodList=新建ArrayList();
静态ArrayList卫生学列表=新ArrayList();
静态ArrayList drinkList=新ArrayList();
静态ArrayList otherList=新建ArrayList();
静态ArrayList foodAmount=新ArrayList();
静态ArrayList hygieneAmount=新ArrayList();
静态ArrayList drinkAmount=新ArrayList();
静态ArrayList otherAmount=新ArrayList();
公共静态void foodOutput(){
ListIterator foodListIterator=foodList.ListIterator(0);
ListIterator foodAmountIterator=foodAmount.ListIterator(0);
if(foodListIterator.hasNext()){
System.out.println(“\t”+“Food”);
做{
System.out.println(“\t”+foodAmountIterator.next()+”\t\t“+”\t--\t”+“\t\t”+foodListIterator.next());
}while(foodListIterator.hasNext());
System.out.println(“”);
}否则{
System.out.println(“\t”+“Food”);
System.out.println(“\t”+“您的列表上没有食物”);
System.out.println(“”);
}
}
公共静态void drinkOutput(){
ListIterator-drinkListIterator=drinkList.ListIterator(0);
ListIterator-drinkAmountIterator=drinkAmount.ListIterator(0);
if(drinkListIterator.hasNext()){
System.out.println(“\t”+“饮料”);
做{
System.out.println(“\t”+drinkAmountIterator.next()+”\t\t“+”\t--\t”+“\t\t”+drinkListIterator.next());
}while(drinkListIterator.hasNext());
System.out.println(“”);
}否则{
System.out.println(“\t”+“饮料”);
System.out.println(“\t”+“您的列表上没有饮料”);
System.out.println(“”);
}
}
公共静态空隙卫生输出(){
ListIterator HygieneListaterator=hygieneList.ListIterator(0);
ListIterator hygieneAmountIterator=hygieneAmount.ListIterator(0);
if(hygieneListIterator.hasNext()){
System.out.println(“\t”+“卫生”);
做{
System.out.println(“\t”+hygieneAmountIterator.next()+”\t\t“+”\t--\t”+“\t\t”+hygieneListIterator.next());
}while(hygieneListIterator.hasNext());
System.out.println(“”);
}否则{
System.out.println(“\t”+“卫生”);
System.out.println(“\t”+“您的列表上没有卫生产品”);
System.out.println(“”);
}
}
公共静态输出(){
ListIterator otherListIterator=otherList.ListIterator(0);
ListIterator otherAmountIterator=otherAmount.ListIterator(0);
if(otherListIterator.hasNext()){
System.out.println(“\t”+“其他产品”);
做{
System.out.println(“\t”+otherAmountIterator.next()+”\t\t“+”\t--\t”+“\t\t”+otherListIterator.next());
}while(otherListIterator.hasNext());
System.out.println(“”);
}否则{
System.out.println(“\t”+“其他产品”);
System.out.println(“\t”+“列表中没有其他产品”);
System.out.println(“”);
}
}
公共静态无效rewe(){
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System.out.println(“”);
System.out.println(“这是您的R