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sontinaresh
How to find maximum value for userdefined objects in ArrayList
1 Answer(s)      a year and 11 months ago
Posted in : Java Beginners


Hi sir,I have requirement i.e finding maximum value in userdefined objects and display that object only and store another collecton object.For example i taken for employe class and write for below sample code ,in this code i can findout maximum value but can't store that object into another object.Please help me how to write logic .

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)); list.add(new Employe(2, "kumar", 600)); list.add(new Employe(2, "kumar", 900));

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

} }

My Excepted output :1 naresh 900 2 kumar 900

My Employe 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;
}

}


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View Answers

October 19, 2012 at 10:45 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);
   }
}


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