Comparable Interface

 ADDRESS.JAVA:

public class Address  implements Comparable<Address>{
    //fill your code here
    
    private String username;
    private String addressLine1;
    private String addressLine2;
    private int pinCode;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getAddressLine1() {
        return addressLine1;
    }
    public void setAddressLine1(String addressLine1) {
        this.addressLine1 = addressLine1;
    }
    public String getAddressLine2() {
        return addressLine2;
    }
    public void setAddressLine2(String addressLine2) {
        this.addressLine2 = addressLine2;
    }
    public int getPinCode() {
        return pinCode;
    }
    public void setPinCode(int pinCode) {
        this.pinCode = pinCode;
    }
    public Address() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Address(String username, String addressLine1, String addressLine2, int pinCode) {
        super();
        this.username = username;
        this.addressLine1 = addressLine1;
        this.addressLine2 = addressLine2;
        this.pinCode = pinCode;
    }
    
    public int compareTo(Address address) {
        if (pinCode == address.pinCode) {
        return (addressLine1.compareTo(address.addressLine1));
        } else if (pinCode > address.pinCode) {
        return 1;
        } else {
        return -1;
        }
    
    }
}

MAIN.JAVA:

import java.io.*;
import java.util.*;
public class Main {
	public static void main(String[] args){
		//fill code here
		 Scanner scan= new Scanner(System.in);
	        System.out.println("Enter the number of users:");
	        int num=scan.nextInt();
	        scan.nextLine();
	        System.out.println("Enter user address in CSV(Username,AddressLine 1,AddressLine 2,PinCode)");
	        ArrayList<Address>address=new ArrayList<Address>();
	        for(int i=0;i<num;i++) {
	        String info[]=scan.nextLine().split(",");
	        address.add(new Address(info[0],info[1],info[2],Integer.parseInt(info[3])));
	        }
	        Collections.sort(address);
	        System.out.println("User Details:");
	        for(Address addr:address) {
	        System.out.println(addr.getUsername()+","+addr.getAddressLine1()+","+addr.getAddressLine2()+","+addr.getPinCode());
	        }
	}
}