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Example1.java
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70 lines (55 loc) · 1.92 KB
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package com.tutorial.def;
import java.util.Comparator;
public class Example1 {
public static void main(String[] args) {
Employee emp1 = new Employee("Xander", 1);
Employee emp2 = new Employee("Jon", 3);
Employee emp3 = new Employee("Greta", 2);
Employee emp4 = new Employee("Greta", 4);
Employee[] employees = {emp1, emp2, emp3, emp4};
System.out.println("Comparator:: sort by name");
java.util.Arrays.sort(employees, new Comparator<Employee>() {
@Override
public int compare(Employee o1, Employee o2) {
return o1.name.compareTo(o2.name);
}
});
//System.out.println(java.util.Arrays.toString(employees));
for (Employee emp :
employees) {
System.out.println(emp.name + " : " + emp.id);
}
System.out.println("Comparator:: sort by id");
java.util.Arrays.sort(employees, new Comparator<Employee>() {
@Override
public int compare(Employee o1, Employee o2) {
return o1.id - o2.id;
}
});
for (Employee emp :
employees) {
System.out.println(emp.name + " : " + emp.id);
}
System.out.println("Comparator:: sort by name and then by id, if name is same");
java.util.Arrays.sort(employees, new Comparator<Employee>() {
@Override
public int compare(Employee o1, Employee o2) {
int nameDiff = o1.name.compareTo(o2.name);
if(nameDiff != 0) return nameDiff;
return o1.id - o2.id;
}
});
for (Employee emp :
employees) {
System.out.println(emp.name + " : " + emp.id);
}
}
}
class Employee{
public String name;
public int id;
Employee(String name, int id){
this.name = name;
this.id = id;
}
}