class Nesoy {
	private int age;
	private String name;

	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

public static void main(String[] args){
	Nesoy p1 = new Nesoy();
	p1.setAge(27);
	p1.setName("YoungJae");

	Nesoy p2 = new Nesoy();
	p2.setAge(27);
	p2.setName("YoungJae");

	System.out.println(p1.equals(p2)); // false
}

@Override
public boolean equals(Object obj) {

    if (obj == null) {
        return false;
    }

    if (this.getClass() != obj.getClass()) {
        return false;
    }

    if (this == obj) {
        System.out.println("Object Same");
        return true;
    }

    Nesoy that = (Nesoy) obj;

    if (this.name == null && that.name != null) {
        return false;
    }

    if (this.age == that.age && this.name.equals(that.name)) {
        System.out.println("Object Value Same");
        return true;
    }

    return false;
}

Map<Nesoy, Integer> map = new HashMap<Nesoy, Integer>();
map.put(p1, 1);
map.put(p2, 1);
System.out.println(map.size()); // 2

@Override
public int hashCode() {

	final int prime = 31;
	int hashCode = 1;

	hashCode = prime * hashCode + ((name == null) ? 0 : name.hashCode());
	hashCode = prime * hashCode + age;

	return hashCode;
}