if statement - Java: Sort lowest-to-highest -

need identify names of youngest/ oldest of following three, using "if" statements: can list students running code, need identify youngest , oldest of three.

public class  app    {       public static void main(string args[])    {       student st1 = new student();       st1.setfirstname("fred");       st1.setlastname("fonz");       st1.setage(44);        student st2 = new student();       st2.setfirstname("john");       st2.setlastname("smith");       st2.setage(20);        student st3 = new student();       st3.setfirstname("zack");       st3.setlastname("mills");       st3.setage(21);        system.out.println("student 1 info = "+ st1.getfirstname()+ " "+          st1.getlastname()+ " "+    st1.getage());       system.out.println("student 2 info = "+ st2.getfirstname()+ " "+         st2.getlastname()+ " "+    st2.getage());       system.out.println("student 3 info = "+ st3.getfirstname()+ " "+         st3.getlastname()+ " "+    st3.getage());   } } 

i think need :

student[] arr = new student[3]; arr[0] = st1; arr[1] = st2; arr[2] = st3; int min_age = integer.max_value, max_age = integer.min_value, min_age_index = 0, max_age_index= 0; for(int =0; <arr.length ; i++){     int age = arr[i].getage();     if(min_age>age) {         min_age = age;         min_age_index = i;     }     if(max_age<age) {         max_age = age;         max_age_index = i;     } } system.out.println("youngest student : "+arr[min_age_index].getfirstname()+" "+arr[min_age_index].getlastname()); system.out.println("oldest student : "+arr[max_age_index].getfirstname()+" "+arr[max_age_index].getlastname());