How to implement conditional control in the code to avoid unnecessary input operations?

Efficient code: conditional control and input optimization

In programming, clever use of conditional control statements can effectively avoid redundant input and improve code efficiency. This article takes student information entry as an example to explain how to optimize the code to avoid repeatedly entering information such as name, age, and address when the student ID is repeated.

The original code has the following problems: ArrayList<student> list</student> is recreated as empty every time the function call, causing the ID to be invalidated; multiple calls to sc.next() cause the input value to be misaligned.

The improved code is as follows:

 public static int addStudent(Student a, ArrayList<student> list) {
    Scanner sc = new Scanner(System.in);
    Student st = new Student();
    int temp = 0; // Determine whether the system.out.println("Please enter student id");
    String inputId = sc.next();

    // Check whether the ID is duplicated for (Student s : list) {
        if (inputId.equals(s.getId())) {
            System.out.println("Student ID already exists!");
            return temp; // ID is repeated, return directly}
    }

    st.setId(inputId);
    System.out.println("Please enter the student name");
    st.setName(sc.next());
    System.out.println("Please enter the student's age");
    st.setAge(sc.nextInt());
    System.out.println("Please enter the student address");
    st.setAddress(sc.nextLine()); // Use nextLine() to read the input of the whole line to avoid line breaks interference temp = 1;
    list.add(st); // Add student information to the list return temp;
}</student>

Key Improvements:

1. External incoming student list: ArrayList<student> list</student> is passed into the function as a parameter, avoiding recreating the list every time the call is called, making sure the ID is repeatedly checked based on global student information.

2. Read ID in advance: The ID input is processed separately and stored in the inputId variable to avoid input misalignment.

3. Use nextLine() : Use sc.nextLine() when reading the address to avoid nextInt() leaving newline characters interfering with subsequent input.

4. Add student information: After successfully adding student information, add st to list .

5. Prompt message: Added duplicate ID prompt message to improve user experience.

Through these improvements, the code logic is clear, unnecessary input operations are avoided, and code efficiency and maintainability are improved. It is recommended that developers be proficient in using debugging tools, such as breakpoint debugging, to help understand the code execution process, and to discover and solve problems in a timely manner.

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