Sorting Object in ArrayList on the bases of field as name and id in java using comperator

Step 1: Create a Bean class

public class CommonPojo {
private int empId;
private String empName;
public CommonPojo() {
// TODO Auto-generated constructor stub
}
public CommonPojo(int id, String name) {
this.empId=id;
this.empName= name;
}
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}

}

Step 2: Writing an UniversalSorting class to sort the objects


import java.util.Comparator;

public class UniversalSorting {
public static enum CommonSort implements Comparator<CommonPojo> {
BY_NAME {
@Override
public int compare(CommonPojo commonPojo1, CommonPojo commonPojo2) {

return commonPojo1.getEmpName().compareTo(commonPojo2.getEmpName());
}
},
BY_ID {
@Override
public int compare(CommonPojo commonPojo1, CommonPojo commonPojo2) {

return commonPojo1.getEmpId() - commonPojo2.getEmpId();

}

}
}
}

Step 3:  Create an universal method in TestCommonSort  class to sort the objects and test it



import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class TestCommonSort {
public static void main(String[] args) {
sortEmployee(UniversalSorting.CommonSort.BY_NAME);
//sortEmployee(UniversalSorting.CommonSort.BY_ID);

}
public static void sortEmployee(UniversalSorting.CommonSort sorting){
try{

List<CommonPojo> listPojo= new ArrayList<CommonPojo>();
listPojo.add(new CommonPojo(1, "Sumit"));
listPojo.add(new CommonPojo(1, "Kuldeep"));
listPojo.add(new CommonPojo(1, "Sanjay"));
listPojo.add(new CommonPojo(31, "Umesh"));
listPojo.add(new CommonPojo(4, "Abhishek"));
listPojo.add(new CommonPojo(6, "Santosh"));
listPojo.add(new CommonPojo(7, "Bharat"));
listPojo.add(new CommonPojo(88, "Dipak"));
Collections.sort(listPojo, sorting);
for(CommonPojo commonPojo: listPojo){
System.out.println(commonPojo.getEmpName());
}

} catch (Exception ex){
ex.printStackTrace();
}
}
}

Step 4: Output

Bharat
Dipak
Kuldeep
Sanjay
Santosh
Sumit
Umesh