String[] student = new String[3]; //String?不是Student类型？
student[].inputStudentDetails(); //这里应该用数组的某个元素

//至少应该是这样的形式
Student student = new Student[3];
student[0] = new Student();
student[0].inputStudentDetails();

------解决方案--------------------
探讨

 String[] student = new String[3];
student是一个数组对象， 数组对象又怎么会有inputStudentDetails()这个方法呢？
这个方法应该是 Student.java里面的才对，所以，你应该这样：
String[] students = new String[]{new Student(),new Student(),new Student(……


------解决方案--------------------
Java code
public class StudentTestr
{
  public static void main(String[] args)
  {
  Student[] student = new Student[]{new Student(),new Student(),new Student()};


  int index = 0;

  while(index<student.length)
  {
  student[index].inputStudentDetails();
  index = index +1;
  }  
  }
}
class Student{//放你的Student内容。
    public void inputStudentDetails() {
        System.out.println("i am a student");
    }
}

------解决方案--------------------
探讨


[Quote=引用:]

现在改成这样的，
import java.lang.String;
public class StudentTestr
{
 public static void main(String[] args)
 {
  Student[] student = new Student[3];
   student[0].inputSt……