Question

请帮帮我。我是编程新手。我有一些任务要提交。我使用Netbeans。我想编辑一个关于给出matric编号的学生的特定数据。首先，系统将提示学生的基础编号。如果找到，系统将询问用户是否要编辑数据（名称或matric或年龄或标记）。用户将指定哪些数据，然后系统将要求用户输入数据的新值。使用新值设置数据后，系统将显示有关学生的所有数据。这是我的代码：

班级：

公共班学生{

int matric;
String name;
int age;
double mark;
String grade;

Student(int m, String n, int a, double mk) {
    matric = m;
    name = n;
    age = a;
    mark = mk;
}


public String computeGrade() {

    return "";
}


public String getName() {
    return name;
}

public void setName(int name) {
    this.matric = name;
}

public int getMatric() {
    return matric;
}

public void setMatric(int matric) {
    this.matric = matric;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public double getMark() {
    return mark;
}

public void setMark(double mark) {
    this.mark = mark;
}








else if (choice == 4) {
            System.out.println ("Edit Student Data");
            System.out.print("Enter the matric number>");
            int matric = read.nextInt();
            boolean found=false;
            for (int i = 0; i < index; i++) {
                if (myStud[i].getMatric() == matric) {
                    System.out.println("======================================");
                    System.out.println("Student Name = " + myStud[i].getName());
                    System.out.println("Student Matric = " + myStud[i].getMatric());
                    System.out.println("Student Age = " + myStud[i].getAge());
                    System.out.println("Student Mark = " + myStud[i].getMark());
                    System.out.println("Student Grade = " + myStud[i].computeGrade());
                    System.out.println("======================================");

                    found=true;



                        System.out.println("1. Edit Name");
                        System.out.println("2. Edit Matric");
                        System.out.println("3. Edit Age");
                        System.out.println("4. Edit Mark");
                        System.out.print ("Please choose data to edit > ");                        
                        int edit = read.nextInt();


                        if(edit == 1){
                        System.out.println("Enter Your Name ");                            
                        String name = read.next ();

                        }
                        else if(edit == 2){
                        System.out.println("Enter Your Matric ");
                        matric = read.nextInt ();

                        }
                        else if(edit == 3){
                        System.out.println("Enter Your Age ");
                        int age = read.nextInt ();
                        // **how to save and replace the oldest?**
                        }
                        else if(edit == 4){
                        System.out.println("Enter Your Mark ");
                        int mark = read.nextInt ();

                        }

                System.out.println("Student Data has been updated!");
                break;
                } 
            }
            if (found==false)
            System.out.println("Student Data not Found!");
        }

Answer 1

首先，你有一个数组，而不是ArrayList。你可以这样做：

myStud[i].setAge(readValue);

用于编辑数组中第i个对象的age属性。

这是你要找的答案吗？

如何编辑arraylist中对象内的每个变量

1 个答案: