Bagaimana Cara Menginputkan Data ke Arrayof object dan loop Pemrograman Berorientasi Objek

Selamat siang, salam sejahtera, saya mau bertanya mengenai script berikut, dimana kesalahannya, dan bagaimana benarnya?

import java.io.*;
import javax.swing.JOptionPane;
public class ClsIdentitas {
	protected String nama, alamat, telp;
	public ClsIdentitas (String nama, String alamat, String telp) {
		this.nama = nama;
		this.alamat = alamat;
		this.telp = telp;
	}

	public void Output() {
		System.out.println("Nama : " + nama + "\nAlamat : " + alamat + "\nTelp : " + telp);
	}
}

public class Karyawanx extends ClsIdentitas {
	private String nik;
	public Karyawanx(String nama, String alamat, String telp, String pNik) {
		super(nama, alamat, telp);
		this.pNik = pNik;
	}

	public String get(){
		return nik;
	}

	public String getNama(){
		return nama;
	}

	public void Output(){
		System.out.println("NIK : " + nik);
		this.Output();
	}
}

public class C1GajiKar {
	private String Gol;
	private int JmlLembur;

	public void Gol(String Gol){
		this.gol = gol;
	}

	public void JmlLembur(int JmlLembur){
		this.JmlLembur = JmlLembur;
	}

	public void tampilHitung(){
		double Gaji;
		double lembur = JmlLembur * 10000;
		if(Gol == 1){
			Gaji = 2500000;
		}
		else if(Gol == 2){
			Gaji = 2000000;
		}
		else if(Gol == 3){
			Gaji = 1750000;
		}
		else {
			Gaji = 1500000;
		}

		System.out.println("Gaji Pokok : " + Gaji);
		System.out.println("Uang Lembur : " + lembur);
		System.out.println((Gaji+lembur));
	}
}

public class Main {
	public static void main(String[] args){
		String input;

		Karyawanx = new Karyawanx[3];
		Karyawanx[0] = new Karyawanx("Riyanti", "Jl.Angkasa 20", "084242242", "16.0289");
		Karyawanx[1] = new Karyawanx("Rahmat Wa", "Jl.Bebek 121", "0746334", "16.0325");
		Karyawanx[2] = new Karyawanx("Dwi Ary", "Jl.Hasyim 100", "084854", "16.0254");

		input = new input[3];

		for(int i = 0; i < 3 ; i++) {
			input[i] = new Karyawanx();

			String data = input[i].get() + " - " + input[i].getNama();

			input = JOptionPane.showInputDialog(data + "\nMasukkan Golongan : ");
			input[i].Gol(Integer.parseDoub(Gol));
			input = JOptionPane.showInputDialog(data + "\nMasukkan jml Lembur : ");
			input[i].JmlLembur(Integer.parseInt(JmlLembur));
		}

		System.out.println("===== TAMPIL DATA GAJI KARYAWAN =====");
		for (int i = 0; i<=3; i++){
			System.out.println("Data " + (i+1));
			Karyawanx[i].Karyawanx();
			Karyawanx[i].tampilHitung();
			System.out.println("=====================================");
		}
	}
}