Untitled

package StudentPack;
import java.io.*;
public class Depersist {

	public static void main(String[] args) {
		try {
			FileInputStream fin = new FileInputStream("f.txt");
			ObjectInputStream in = new ObjectInputStream(fin);
			Student s = (Student)in.readObject();
			in.close();
			System.out.println(s.name+" "+s.id);
		}catch(Exception e) {
			System.out.println(e);
		}
	}

}
package StudentPack;
import java.io.Serializable;
public class Student implements Serializable {
	int id;
	String name;
	public Student(int id,String name) {
		this.id=id;
		this.name=name;
	}
}

package StudentPack;
import java.io.*;
public class Persist {
	public static void main(String[] args) {
		try {
			Student s1 =new Student(211,"ravi");
			
			FileOutputStream fout= new FileOutputStream("f.txt");
			ObjectOutputStream out = new ObjectOutputStream(fout);
			out.writeObject(s1);
			out.flush();
			out.close();
			System.out.println("Success");
		}catch(Exception e) {
			System.out.println(e);
		}
	}

}
package L2;
import java.io.*;
import java.util.*;
class Student{
	int rollno,year,sem,age;
	String name,branch;
	float fees;
	static String clg;
	public Student(int rollno,String name,float fees,String branch,int year,int sem,int age) {
		this.age=age;
		this.branch=branch;
		this.fees=fees;
		this.name=name;
		this.rollno=rollno;
		this.sem=sem;
		this.year=year;
		clg="PU";
	}
	public String toString() {
		return rollno+" "+name+" "+fees+" "+branch+" "+year+" "+sem+" "+age+" "+clg+"\n"; 
	}
}
class AgeComparator implements Comparator{
	public int compare(Object o1,Object o2) {
		Student s1=(Student)o1;
		Student s2=(Student)o2;
		if(s1.age==s2.age)
			return 0;
		else if(s1.age>s2.age)
			return 1;
		else
			return -1;
	}
}
class NameComparator implements Comparator{
	public int compare(Object o1, Object o2) {
		Student s1=(Student)o1;
		Student s2=(Student)o2;
		return s1.name.compareTo(s2.name);
	}
}
class FeeComparator implements Comparator{
	public int compare(Object o1,Object o2) {
		Student s1=(Student)o1;
		Student s2=(Student)o2;
		if(s1.fees==s2.fees)
			return 0;
		else if(s1.fees>s2.fees)
			return 1;
		else
			return -1;
	}
}
public class Temp {

	public static void main(String[] args) {
		ArrayList sl = new ArrayList();
		sl.add(new Student(1,"Shiva",10000.00f,"cse",1,1,18));
		sl.add(new Student(2,"Venky",15000.00f,"ise",1,2,20));
		sl.add(new Student(3,"Jesus",17000.00f,"ece",1,1,19));
		sl.add(new Student(3,"Alla",12000.00f,"eee",1,1,19));
		sl.add(new Student(3,"Budda",12000.00f,"mec",1,1,21));

		System.out.println("Sorting by Name");
		System.out.println("_________________");
		Collections.sort(sl,new NameComparator());
		Iterator itr = sl.iterator();
		while(itr.hasNext()) {
			Student st=(Student)itr.next();
			System.out.println(st);
		}
		System.out.println("Sorting by Age");
		System.out.println("_________________");
		Collections.sort(sl,new AgeComparator());
		Iterator itr1 = sl.iterator();
		while(itr1.hasNext()) {
			Student st=(Student)itr1.next();
			System.out.println(st);
		}
		System.out.println("Sorting by Fees");
		System.out.println("_________________");
		Collections.sort(sl,new FeeComparator());
		Iterator itr2 = sl.iterator();
		while(itr2.hasNext()) {
			Student st=(Student)itr2.next();
			System.out.println(st);
		}
	}

}