This is a simple program to test read write Java objects

ReadWriteObjects.java

package me.yogedra.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class ReadWriteObjects {

  static String dataFile = "/tmp/contactEmployee.dat";
	
	public static void main(String[] args) {
		if(args != null && args.length > 0){
			dataFile = args[0];
		}
			
		ContractEmployee [] list = new ContractEmployee [] {
				new ContractEmployee("CE001", "Foo1 Bar3", "India", 15.0f),
				new ContractEmployee("CE002", "Foo2 Bar3", "USA", 95.0f),
				new ContractEmployee("CE002", "Foo3 Bar3", "Australia", 45.0f),
		};
		write(list, dataFile);
		ContractEmployee [] readList = read(dataFile);
		for(ContractEmployee e : readList){
			System.out.printf("Id: %1$s\nName: %2$s\nAddress: %3$s\nDaily Rate: %4$4.2f\n", e.empCode, e.empName, e.empAddress, e.empDailyRate);
		}
		
	}
	
	private static ContractEmployee[] read( String file){
		try{
			ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File(file)));
			Object o = ois.readObject();
			ois.close();
			ContractEmployee [] d = (ContractEmployee[]) o;
			return d;
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
	private static void write(ContractEmployee [] data, String file){
		try {
			ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File(file)));
			oos.writeObject(data);
			oos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private static class ContractEmployee implements Serializable{
		String empCode;
		String empName;
		String empAddress;
		float empDailyRate;
		public ContractEmployee(){
			
		}
		public ContractEmployee(String empCode, String empName,
				String empAddress, float empDailyRate) {
			super();
			this.empCode = empCode;
			this.empName = empName;
			this.empAddress = empAddress;
			this.empDailyRate = empDailyRate;
		}	
	}
}