How to convert json string to java object using Gson APIs?

package com.java2novice.json.gson;

public class Employee {

	private int empId;
	private String name;
	private String designation;
	private String department;
	private int salary;
	
	public int getEmpId() {
		return empId;
	}
	public void setEmpId(int empId) {
		this.empId = empId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDesignation() {
		return designation;
	}
	public void setDesignation(String designation) {
		this.designation = designation;
	}
	public String getDepartment() {
		return department;
	}
	public void setDepartment(String department) {
		this.department = department;
	}
	public int getSalary() {
		return salary;
	}
	public void setSalary(int salary) {
		this.salary = salary;
	}
}

{
    "empId": 1017,
    "name": "Nagesh Y",
    "designation": "Manager",
    "department": "Java2Novice",
    "salary": 30000
}

package com.java2novice.json.gson;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;

import com.google.gson.Gson;

public class JsonToObjectEx {

	public static void main(String a[]){
		
		BufferedReader br = null;
		Gson gsonObj = new Gson();
		try {
			br = new BufferedReader(new FileReader("/Users/ngootooru/jsonInput.txt"));
			// convert json string to object
			Employee emp = gsonObj.fromJson(br, Employee.class);
			System.out.println("Emp Name: "+emp.getName());
			System.out.println("Emp Id: "+emp.getEmpId());
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Emp Name: Nagesh Y
Emp Id: 1017