Basics of Classes and Objects in java

package javaapplication1;



class Student
{
private int rollNo;
    private String name;
    private double marks;
    public Student(int rollNo, String name, double marks) {
            this.rollNo = rollNo;
            this.name = name;
            this.marks = marks;
    }
    public double getMarks() {
    return marks;
    }
public void setMarks(double marks) {
this.marks = marks;
}
public int getRollNo() {
return rollNo;
}
public String getName() {
return name;
}
}





package javaapplication1;



class StudentDemo
{
public static void main(String args[])
{
Student one =new Student(1,"Ravi",45);
Student two =new Student(2,"Ravish",95);
Student three =new Student(3,"Ravindra",75);
System.out.println("Highest is "+compareHighest(one,two,three));
}
public static String compareHighest(Student one,Student two,Student three)
{
Student st=one;
if(st.getMarks()<two.getMarks())
{
st=two;
}
if(st.getMarks()<three.getMarks())
{
st=three;
}
return st.getName();
}
}