While 循环用于追踪步数

1public class LoopDemo {
2    public static void main(String[] args) {
3        int count = 1;
4
5        while (count <= 5) {
6            System.out.println("This is loop number " + count);
7            count = count + 1;
8        }
9    }
10}

Code Example

1Enter your steps (or type 'done' to finish): 3000  
2Enter your steps (or type 'done' to finish): 4500  
3Enter your steps (or type 'done' to finish): 2200  
4Enter your steps (or type 'done' to finish): done  
5
6Total steps: 9700  
7Great job staying active!  

1import java.util.Scanner;
2
3public class StepTracker {
4    public static void main(String[] args) {
5        Scanner scanner = new Scanner(System.in);
6
7        int totalSteps = 0;
8
9        System.out.print("Enter your steps (or type 'done' to finish): ");
10        String userInput = scanner.nextLine();
11
12        while (!userInput.equals("done")) {
13            if (userInput.matches("\\d+")) {
14                int steps = Integer.parseInt(userInput);
15                totalSteps += steps;
16            } else {
17                System.out.println("Invalid input. Please enter a number or 'done'.");
18            }
19
20            System.out.print("Enter your steps (or type 'done' to finish): ");
21            userInput = scanner.nextLine();
22        }
23
24        System.out.println("Total steps: " + totalSteps);
25        System.out.println("Great job staying active!");
26
27        scanner.close();
28    }
29}

1import java.util.Scanner;
2
3public class StepTracker {
4    public static void main(String[] args) {
5        Scanner scanner = new Scanner(System.in);
6
7        int totalSteps = 0;
8
9        System.out.print("Enter your steps (or type 'done' to finish): ");
10        String userInput = scanner.nextLine();
11
12        while (!userInput.equals("done")) {
13            if (userInput.matches("\\d+")) {
14                int steps = Integer.parseInt(userInput);
15                totalSteps += steps;
16            } else {
17                System.out.println("Invalid input. Please enter a number or 'done'.");
18            }
19
20            System.out.print("Enter your steps (or type 'done' to finish): ");
21            userInput = scanner.nextLine();
22        }
23
24        System.out.println("Total steps: " + totalSteps);
25        System.out.println("Great job staying active!");
26
27        scanner.close();
28    }
29}

Code Example

1Enter your daily step goal: 5000  
2Enter steps taken (or type 'done' to finish): 1200  
3Enter steps taken (or type 'done' to finish): 2500  
4Enter steps taken (or type 'done' to finish): done  
5
6Total steps taken: 3700  
7Steps left to reach your goal: 1300  
8Keep moving and stay active!

1import java.util.Scanner;
2
3public class StepGoalTracker {
4    public static void main(String[] args) {
5        Scanner scanner = new Scanner(System.in);
6
7        // --- Goal input with validation ---
8        System.out.print("Enter your daily step goal: ");
9        String goalInput = scanner.nextLine();
10
11        while (!goalInput.matches("\\d+") || Integer.parseInt(goalInput) <= 0) {
12            System.out.println("Invalid input. Please enter a positive number.");
13            goalInput = scanner.nextLine();
14        }
15        int goal = Integer.parseInt(goalInput);
16
17        int totalSteps = 0;
18
19        // --- Loop for step input ---
20        System.out.print("Enter steps taken (or type 'done' to finish): ");
21        String userInput = scanner.nextLine();
22
23        while (!userInput.equals("done")) {
24            if (userInput.matches("\\d+")) {
25                int steps = Integer.parseInt(userInput);
26                if (steps > 0) { // prevent negative or zero values
27                    totalSteps += steps;
28                } else {
29                    System.out.println("Please enter a positive number.");
30                }
31            } else {
32                System.out.println("Invalid input. Please enter a number or 'done'.");
33            }
34
35            System.out.print("Enter steps taken (or type 'done' to finish): ");
36            userInput = scanner.nextLine();
37        }
38
39        // --- Final Output ---
40        System.out.println("Total steps taken: " + totalSteps);
41        System.out.println("Steps left to reach your goal: " + (goal - totalSteps));
42        System.out.println("Keep moving and stay active!");
43
44        scanner.close();
45    }
46}

1import java.util.Scanner;
2
3public class StepGoalTracker {
4    public static void main(String[] args) {
5        Scanner scanner = new Scanner(System.in);
6
7        // --- Goal input with validation ---
8        System.out.print("Enter your daily step goal: ");
9        String goalInput = scanner.nextLine();
10
11        while (!goalInput.matches("\\d+") || Integer.parseInt(goalInput) <= 0) {
12            System.out.println("Invalid input. Please enter a positive number.");
13            goalInput = scanner.nextLine();
14        }
15        int goal = Integer.parseInt(goalInput);
16
17        int totalSteps = 0;
18
19        // --- Loop for step input ---
20        System.out.print("Enter steps taken (or type 'done' to finish): ");
21        String userInput = scanner.nextLine();
22
23        while (!userInput.equals("done")) {
24            if (userInput.matches("\\d+")) {
25                int steps = Integer.parseInt(userInput);
26                if (steps > 0) { // prevent negative or zero values
27                    totalSteps += steps;
28                } else {
29                    System.out.println("Please enter a positive number.");
30                }
31            } else {
32                System.out.println("Invalid input. Please enter a number or 'done'.");
33            }
34
35            System.out.print("Enter steps taken (or type 'done' to finish): ");
36            userInput = scanner.nextLine();
37        }
38
39        // --- Final Output ---
40        System.out.println("Total steps taken: " + totalSteps);
41        System.out.println("Steps left to reach your goal: " + (goal - totalSteps));
42        System.out.println("Keep moving and stay active!");
43
44        scanner.close();
45    }
46}