Hi Friend,

Try the following code:

import java.util.*;

class Employee implements Comparable{
int id;
String name;
int salary;

public void setId(int id){
this.id=id;
}
public int getId(){
return id;
}

public void setName(String name){
this.name=name;
}
public String getName(){
return name;
}
public void setSalary(int salary){
this.salary=salary;
}
public int getSalary(){
return salary;
}
public int compareTo(Object ob) throws ClassCastException {
if (!(ob instanceof Employee))
throw new ClassCastException("Error");
int sal = ((Employee) ob).getSalary();
return this.salary - sal;
}
}
class Manager extends Employee{
int bonus;
public void setBonus(int bonus){
this.bonus=bonus;
}
public int getBonus(){
return bonus;
}
}
class DisplayInformation{

public static void main(String[]args){
Manager data[]=new Manager[5];
data[0] = new Manager();
data[0].setId(1);
data[0].setName("A");
data[0].setSalary(1000);

data[1] = new Manager();
data[1].setId(2);
data[1].setName("B");
data[1].setSalary(4000);

data[2] = new Manager();
data[2].setId(3);
data[2].setName("C");
data[2].setSalary(3000);

data[3] = new Manager();
data[3].setId(4);
data[3].setName("D");
data[3].setSalary(5000);

data[4] = new Manager();
data[4].setId(5);
data[4].setName("E");
data[4].setSalary(2000);
for(int i=0;i<5;i++){
Manager show = data[i];
int no=show.getId();
String name = show.getName();
int sal = show.getSalary();
System.out.println(no + " " + name + " " + sal);
}
Arrays.sort(data);
System.out.println("********Sorted by sal********");

for (int i=0; i<5; i++) {
Manager show = data[i];
int no=show.getId();
String name = show.getName();
int sal = show.getSalary();
System.out.println(no + " " + name + " " + sal);
}
}
}

Hope that it will be helpful for you.
Thanks