Populating an array using user input(JAVA)

So I have made a 'Student' class which has some data members,and methods....What I want to do is get input from the user using a form and then initialize a student object using the values entered by the user. I used the following code but somehow every Student object has the same values as the last entered user input. Srry for bad English

  //Declared in main class
  Student1 stu = new Student1();
  Student1[] Student1Array = new Student1[200];
  int Mcounter =0;

     //elsewhere in the program
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

    int Admno = Integer.parseInt(admTF.getText());
    String Name = name.getText();
    int Standard = Integer.parseInt((String)(ClassCB.getSelectedItem());     
    String S = (String)SectionCB.getSelectedItem();
    char Section = S.charAt(0);
    String G = (String)GenderCB.getSelectedItem();
    char Gender = G.charAt(0);



      stu.CreateStudent(Admno,Name,Standard,Section,Gender);
      Student1Array[Mcounter]=stu;


      Mcounter++;
       }

//Student class
public class Student1 {   


int standard;
char section ;

void CreateStudent(int n,String s,int c,char sec,char g){
 admissionNo=n;        
 name=s;
 standard=c;
 section = sec;
 gender=g;
 }
  }

The jButton is called whenever the user makes their entry, I need to populate the Student1Array but can't.