Question

我正在创建一个程序来显示已存储在数组中的类的名称，年龄和gpa。我使用构造函数，访问器和打印细节的方法创建了Student类。

在main方法中，我填充数组并希望显示数组中的所有项（这是我遇到的问题）。

这是我到目前为止所做的：

public class Student {
  private String name;
  private int age;
  private double gpa;

public Student(String studentName, int studentAge, double studentGpa) {
   this.name = studentName;
   this.age = studentAge;
   this.gpa = studentGpa;
}

//Normal accessors, not going to bother putting them on here.

public void printStudents() {
   System.out.println("Name: " + name + ", Age: " + age + ", GPA: " + gpa);
}

//New class, imagine it's on a different file

public class MyClass {

private static Student [] students = new Student[3];

System.out.println("Students in my class");

students[0] = new Student("Mark",16,77.6);
students[1] = new Student("Sam",17,56.9);
students[2] = new Student("Polly",16,97.4);

for (int g = 0; g < students.length; g++) {
//This is where I'm stuck, I'm not sure how to call printStudents here. students.printStudents didn't work for some reason.

Answer 1

class Student {
  private String name;
  private int age;
  private double gpa;

public Student(String studentName, int studentAge, double studentGpa) {
   this.name = studentName;
   this.age = studentAge;
   this.gpa = studentGpa;
}
public void printStudent() {
   System.out.println("Name : "+this.name);
   System.out.println("Age : "+this.age);
   System.out.println("GPA : "+this.gpa);
}
 }




public class MyClass {
public static void main(String s[])
{

 Student [] students = new Student[3];

System.out.println("Students in my class");

students[0] = new Student("Mark",16,77.6);
students[1] = new Student("Sam",17,56.9);
students[2] = new Student("Polly",16,97.4);

for (int i = 0; i <=(students.length-1); i++) {
    students[i].printStudent();
}
}
}

Answer 2

正如@Hello_World在评论中提到的那样 - 将brew install phantomjs方法名称更改为printStudents以使其更有意义。它是printStudent对象的公共方法，这意味着您可以直接从对象的实例访问它（例如Student）。您还可以使用foreach循环遍历数组，这样更容易阅读。

students[0].printStudent()

使用外部方法的Java打印阵列

2 个答案: