int choice=scanner.nextInt();

这段代码是在Java中用Scanner类读取用户输入的整数值并将其存储在整型变量choice中。用户输入整数值后，程序将会继续执行下一步的操作。需要注意的是，如果用户输入的不是整数值，程序将会抛出InputMismatchException异常。因此，在使用scanner.nextInt()方法时，需要进行异常处理。

相关问题

int choice = scanner.nextInt(); scanner.nextLine();

这段代码是用来获取用户输入的整数值，并获取用户输入的下一行文本。首先，使用`scanner.nextInt()`方法获取用户输入的整数值，然后使用`scanner.nextLine()`方法获取用户输入的下一行文本。这是因为`nextInt()`方法只会读取整数值，而不会读取换行符。因此，需要使用`nextLine()`方法读取换行符，以便后续的输入可以正常进行。

import java.util.ArrayList;import java.util.Scanner;class Clothes { private String name; private String color; private int size; public Clothes(String name, String color, int size) { this.name = name; this.color = color; this.size = size; } public String getName() { return name; } public String getColor() { return color; } public int getSize() { return size; }}class Wardrobe { private ArrayList<Clothes> clothesList = new ArrayList<>(); public void addClothes(Clothes clothes) { clothesList.add(clothes); } public void removeClothes(int index) { clothesList.remove(index); } public void listClothes() { for (int i = 0; i < clothesList.size(); i++) { Clothes clothes = clothesList.get(i); System.out.println((i + 1) + ". " + clothes.getName() + " (" + clothes.getColor() + ", " + clothes.getSize() + ")"); } }}public class WardrobeManagementSystem { public static void main(String[] args) { Wardrobe wardrobe = new Wardrobe(); Scanner scanner = new Scanner(System.in); while (true) { System.out.println("请选择操作："); System.out.println("1. 添加衣物"); System.out.println("2. 删除衣物"); System.out.println("3. 查看衣柜中的衣物"); System.out.println("4. 退出"); int choice = scanner.nextInt(); scanner.nextLine(); switch (choice) { case 1: System.out.println("请输入衣物名称："); String name = scanner.nextLine(); System.out.println("请输入衣物颜色："); String color = scanner.nextLine(); System.out.println("请输入衣物尺寸："); int size = scanner.nextInt(); scanner.nextLine(); Clothes clothes = new Clothes(name, color, size); wardrobe.addClothes(clothes); System.out.println("衣物添加成功！"); break; case 2: System.out.println("请输入要删除的衣物编号："); int index = scanner.nextInt() - 1; scanner.nextLine(); wardrobe.removeClothes(index); System.out.println("衣物删除成功！"); break; case 3: wardrobe.listClothes(); break; case 4: System.out.println("程序已退出！"); System.exit(0); default: System.out.println("输入有误，请重新输入！"); break; } } }}优化代码

以下是对代码的优化建议：

1. 将衣服的属性封装为一个Clothing类，使代码更加模块化和易读。

2. 在Wardrobe类中，可以使用更加简洁的foreach循环来遍历衣服列表。

3. 在程序退出时，可以使用scanner的close()方法来关闭输入流。

4. 在用户输入选项时，可以使用try-catch语句来避免程序崩溃，例如用户输入了一个非数字字符。

下面是对代码的优化后的示例：

import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.Scanner;

class Clothing {
    private String name;
    private String color;
    private int size;

    public Clothing(String name, String color, int size) {
        this.name = name;
        this.color = color;
        this.size = size;
    }

    public String getName() {
        return name;
    }

    public String getColor() {
        return color;
    }

    public int getSize() {
        return size;
    }
}

class Wardrobe {
    private ArrayList<Clothing> clothingList = new ArrayList<>();

    public void addClothing(Clothing clothing) {
        clothingList.add(clothing);
    }

    public void removeClothing(int index) {
        clothingList.remove(index);
    }

    public void listClothing() {
        for (Clothing clothing : clothingList) {
            System.out.println((clothingList.indexOf(clothing) + 1) + ". " + clothing.getName() + " (" + clothing.getColor() + ", " + clothing.getSize() + ")");
        }
    }
}

public class WardrobeManagementSystem {
    public static void main(String[] args) {
        Wardrobe wardrobe = new Wardrobe();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加衣物");
            System.out.println("2. 删除衣物");
            System.out.println("3. 查看衣柜中的衣物");
            System.out.println("4. 退出");

            try {
                int choice = scanner.nextInt();
                scanner.nextLine();

                switch (choice) {
                    case 1:
                        System.out.println("请输入衣物名称：");
                        String name = scanner.nextLine();
                        System.out.println("请输入衣物颜色：");
                        String color = scanner.nextLine();
                        System.out.println("请输入衣物尺寸：");
                        int size = scanner.nextInt();
                        scanner.nextLine();
                        Clothing clothing = new Clothing(name, color, size);
                        wardrobe.addClothing(clothing);
                        System.out.println("衣物添加成功！");
                        break;
                    case 2:
                        System.out.println("请输入要删除的衣物编号：");
                        int index = scanner.nextInt() - 1;
                        scanner.nextLine();
                        wardrobe.removeClothing(index);
                        System.out.println("衣物删除成功！");
                        break;
                    case 3:
                        wardrobe.listClothing();
                        break;
                    case 4:
                        System.out.println("程序已退出！");
                        scanner.close();
                        System.exit(0);
                    default:
                        System.out.println("输入有误，请重新输入！");
                        break;
                }
            } catch (InputMismatchException e) {
                System.out.println("输入有误，请重新输入！");
                scanner.nextLine();
            }
        }
    }
}