[Java] Object method - toString(), equals()

• toString()
• http://koronya.tistory.com/entry/%EC%82%AC%EC%9A%A9%EC%9E%90-%EC%A0%95%EC%9D%98-%ED%81%B4%EB%9E%98%EC%8A%A4-%EA%B0%9D%EC%B2%B4%EC%9D%98-%EB%82%B4%EC%9A%A9-%EC%B6%9C%EB%A0%A5%ED%95%98%EA%B8%B0-toString
• equals()
• http://ojava.tistory.com/15
• http://www.programmerinterview.com/index.php/java-questions/java-whats-the-difference-between-equals-and/