How to find maximum value in ArrayList

**Sir i am writing below code but its not working.i don't know how to implement logic my requirement.My requirement is find maximum value in userdefined objects and dispaly that object values only.This object store in another collection object(list,set) MY sample code:

package com.naresh; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set;

public class EmpList {

public static Set getList(List<Employe> list){ Employe emp=null;

Set s = new HashSet<Employe>();

for(Employe e:list){  //outer

    for(Employe e1:list){  //inner

        if(e.getEno()==e1.getEno()&&e.getName().equals(e1.getName())) {

            if(e.getSalary()>e1.getSalary()) {
                s.add(e);

                }
        }
    }
}
    return s;
}

public static void main(String[] args) { List<Employe> list = new ArrayList<Employe>(); list.add(new Employe(1,"naresh", 200)); list.add(new Employe(1, "naresh", 400)); list.add(new Employe(1, "naresh", 500)); list.add(new Employe(1, "naresh", 900));

System.out.println(EmpList.getList(list));

} }

Exectep OutPut Is: 1 naresh 900 print this object only

My Employe class:

package com.naresh;

import java.util.Comparator;

public class Employe{

int eno;
String name;
double salary;

public int getEno() {
    return eno;
}
public void setEno(int eno) {
    this.eno = eno;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public double getSalary() {
    return salary;
}
public void setSalary(double salary) {
    this.salary = salary;
}
public Employe(int eno , String name , double salary) {
    this.eno = eno;
    this.name = name;
    this.salary = salary;

}
public String toString(){
    return eno+" "+name+" "+salary;
}

}

Please help any one how to write above logic

October 19, 2012 at 10:47 AM

Here is a code that calculates the highest salary from the list of employees.

import java.io.*;
import java.util.*;

class Employee{
public int salary;
public String name;
public String address;
public static int count = 0;
public Employee(){}
public Employee(String name,String address,int salary) {
super();
this.name = name;
this.address=address;
this.salary = salary;

count++;
}

public String getName() {
return name;
}
public String getAddress() {
return address;
}
public int getSalary() {
return salary;
}
}
class SalaryComparator implements Comparator{
    public int compare(Object emp1, Object emp2){
        int sal1 = ((Employee)emp1).getSalary();        
        int sal2 = ((Employee)emp2).getSalary();

        if(sal1 > sal2)
            return 1;
        else if(sal1 < sal2)
            return -1;
        else
            return 0;    
    }
}

public class EmployeeSalary {

public static void main(String[] args) throws Exception {
List<Employee> list = new ArrayList<Employee>();
list.add(new Employee("A","Delhi",10000));
list.add(new Employee("B","Mumbai",20000));
list.add(new Employee("C","Chennai",15000));
list.add(new Employee("D","Kolkata",12000));
System.out.println(" ");
int count=0;
int salary=0;
               Collections.sort(list,new SalaryComparator());
                for(Employee data: list){
                salary=data.getSalary();
                } 
                System.out.println("Highest salary is: "+salary);
   }
}