数组和数组操作

代码示例

1Breakfast: 400  
2Lunch: 600  

1int[] calories = {400, 600, 300}; // 一天各餐的卡路里列表
2String[] meals = {"Breakfast", "Lunch", "Dinner"}; // 各餐名称列表

1int[] meals = {400, 600, 300};

1int[] meals = {400, 600, 300};
2System.out.println(Arrays.toString(meals));
3 

1import java.util.Arrays;
2
3public class MealTotals {
4    public static void main(String[] args) {
5        int[] meals = {400, 600, 300};
6        int total = 0;
7
8        for (int meal : meals) {
9            total += meal;
10        }
11
12        System.out.println("一天总卡路里: " + total);
13    }
14}

代码示例

1请输入第1天的餐食（用逗号分隔）：Breakfast,Lunch,Dinner
2请输入第1天各餐的卡路里（用逗号分隔）：400,600,300
3
4第1天餐食：[Breakfast, Lunch, Dinner]
5第1天总卡路里：1300
6
7请输入第2天的餐食（用逗号分隔）：Breakfast,Lunch,Dinner
8请输入第2天各餐的卡路里（用逗号分隔）：500,700,250
9
10第2天餐食：[Breakfast, Lunch, Dinner]
11第2天总卡路里：1450
12
13一周总卡路里：2750
14很棒，继续保持饮食记录！

1// 健康餐食追踪器
2
3import java.util.*;
4
5public class HealthyMealsTracker {
6    public static void main(String[] args) {
7        Scanner sc = new Scanner(System.in);
8        int weeklyTotal = 0;  // 存储一周总卡路里
9
10        // --- 每日输入循环 ---
11        for (int day = 1; day <= 2; day++) { // 测试时使用2天
12            System.out.print("请输入第 " + day + " 天的餐食（用逗号分隔）: ");
13            String[] meals = sc.nextLine().split(",");
14
15            System.out.print("请输入第 " + day + " 天各餐的卡路里（用逗号分隔）: ");
16            String[] calStr = sc.nextLine().split(",");
17            int[] calories = new int[calStr.length];
18
19            for (int i = 0; i < calStr.length; i++) {
20                calories[i] = Integer.parseInt(calStr[i].trim());
21            }
22
23            int dayTotal = 0;
24            for (int cal : calories) {
25                dayTotal += cal;
26            }
27
28            System.out.println("第 " + day + " 天餐食: " + Arrays.toString(meals));
29            System.out.println("第 " + day + " 天总卡路里: " + dayTotal);
30
31            weeklyTotal += dayTotal; // 将当天卡路里加入一周总计
32        }
33
34        // --- 最终输出 ---
35        System.out.println("一周总卡路里: " + weeklyTotal);
36        System.out.println("很棒，继续保持饮食记录！");
37    }
38}

1// 健康餐食追踪器
2
3import java.util.*;
4
5public class HealthyMealsTracker {
6    public static void main(String[] args) {
7        Scanner sc = new Scanner(System.in);
8        int weeklyTotal = 0;  // 存储一周总卡路里
9
10        // --- 每日输入循环 ---
11        for (int day = 1; day <= 2; day++) { // 测试时使用2天
12            System.out.print("请输入第 " + day + " 天的餐食（用逗号分隔）: ");
13            String[] meals = sc.nextLine().split(",");
14
15            System.out.print("请输入第 " + day + " 天各餐的卡路里（用逗号分隔）: ");
16            String[] calStr = sc.nextLine().split(",");
17            int[] calories = new int[calStr.length];
18
19            for (int i = 0; i < calStr.length; i++) {
20                calories[i] = Integer.parseInt(calStr[i].trim());
21            }
22
23            int dayTotal = 0;
24            for (int cal : calories) {
25                dayTotal += cal;
26            }
27
28            System.out.println("第 " + day + " 天餐食: " + Arrays.toString(meals));
29            System.out.println("第 " + day + " 天总卡路里: " + dayTotal);
30
31            weeklyTotal += dayTotal; // 将当天卡路里加入一周总计
32        }
33
34        // --- 最终输出 ---
35        System.out.println("一周总卡路里: " + weeklyTotal);
36        System.out.println("很棒，继续保持饮食记录！");
37    }
38}

代码示例

1今天吃了多少零食？ 3
2请输入零食名称：Chips
3请输入零食卡路里：150
4请输入零食名称：Juice
5请输入零食卡路里：200
6请输入零食名称：Cookies
7请输入零食卡路里：100
8
9今天的零食：[Chips, Juice, Cookies]
10今天零食数量：3
11卡路里：[150, 200, 100]
12零食总卡路里：450
13记得用健康餐食来平衡零食摄入！

1// 每日零食追踪器
2
3import java.util.*;
4
5public class DailySnacksTracker {
6    public static void main(String[] args) {
7        Scanner sc = new Scanner(System.in);
8
9        // --- 目标输入 ---
10        System.out.print("今天吃了多少零食？ ");
11        int numSnacks = sc.nextInt();
12        sc.nextLine(); // 消耗剩余的换行符
13
14        ArrayList<String> snacks = new ArrayList<>();   // 存储零食名称
15        ArrayList<Integer> calories = new ArrayList<>(); // 存储零食卡路里
16
17        // --- 零食输入循环 ---
18        for (int i = 0; i < numSnacks; i++) {
19            System.out.print("请输入零食名称: ");
20            String snack = sc.nextLine();
21            snacks.add(snack);
22
23            System.out.print("请输入零食卡路里: ");
24            int cal = sc.nextInt();
25            sc.nextLine(); // 消耗剩余的换行符
26            calories.add(cal);
27        }
28
29        // --- 最终输出 ---
30        System.out.println("今天的零食: " + snacks);
31        System.out.println("今天零食数量: " + snacks.size());
32        System.out.println("卡路里: " + calories);
33
34        int total = 0;
35        for (int cal : calories) {
36            total += cal;
37        }
38
39        System.out.println("零食总卡路里: " + total);
40        System.out.println("记得用健康餐食来平衡零食摄入！");
41    }
42}

1// 每日零食追踪器
2
3import java.util.*;
4
5public class DailySnacksTracker {
6    public static void main(String[] args) {
7        Scanner sc = new Scanner(System.in);
8
9        // --- 目标输入 ---
10        System.out.print("今天吃了多少零食？ ");
11        int numSnacks = sc.nextInt();
12        sc.nextLine(); // 消耗剩余的换行符
13
14        ArrayList<String> snacks = new ArrayList<>();   // 存储零食名称
15        ArrayList<Integer> calories = new ArrayList<>(); // 存储零食卡路里
16
17        // --- 零食输入循环 ---
18        for (int i = 0; i < numSnacks; i++) {
19            System.out.print("请输入零食名称: ");
20            String snack = sc.nextLine();
21            snacks.add(snack);
22
23            System.out.print("请输入零食卡路里: ");
24            int cal = sc.nextInt();
25            sc.nextLine(); // 消耗剩余的换行符
26            calories.add(cal);
27        }
28
29        // --- 最终输出 ---
30        System.out.println("今天的零食: " + snacks);
31        System.out.println("今天零食数量: " + snacks.size());
32        System.out.println("卡路里: " + calories);
33
34        int total = 0;
35        for (int cal : calories) {
36            total += cal;
37        }
38
39        System.out.println("零食总卡路里: " + total);
40        System.out.println("记得用健康餐食来平衡零食摄入！");
41    }
42}