Java Input Student Scores

public class Card {

/**
* @param args
*/
public static void Main (string[] args) {
TODO auto-generated Method Stub
int stu[] = new INT[3];
try{
for (int i=0; i<stu.length;i++) {
Student s = new Student ();
S.getstudent ();
S.showstudent ();
S.averstudent ();
}
}catch (Exception e) {
SYSTEM.OUT.PRINTLN ("Input error:");
}
}
}

Class Student {
int id;
String name;
Double a,b,c;
Double avg;
Object E=null;

public void Getstudent () {
Scanner keyboard=new Scanner (system.in);
System.out.println ("Please enter the study number:");
Id=keyboard.nextint ();
System.out.println ("Please enter Name:");
Name=keyboard.next ();
SYSTEM.OUT.PRINTLN ("Please input language lesson results:");
A=keyboard.nextint ();
System.out.println ("Please enter math class results:");
B=keyboard.nextint ();
SYSTEM.OUT.PRINTLN ("Please input English class results:");
C=keyboard.nextint ();
}
public void Showstudent () {
SYSTEM.OUT.PRINTLN ("Study Number:" +id+ "" + "Name:" + name+ "" + "language class results:" +a+ "" + "math class results:" +b+ "" + "English class results:" +c);
}
public void Averstudent () {
avg= (A+B+C)/3;
System.out.println ("The average score for each class is:" +avg);
}

}

Java Input Student Scores