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Update what-issues-should-be-considered-when-overriding-equals-and-hashcode-in-java.md

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`1`		`-##重写(Override)equlas和hashCode方法时应考虑的问题`
	`1`	`+##重写(Override)equals和hashCode方法时应考虑的问题`
`2`	`2`
`3`	`3`	`###理论上讲(编程语言、数学层面)`
`4`	`4`	`equals() 定义了对象的相等关系(自反性、对称性、传递性)(有点抽象,更详细说明,请参考[javadoc](http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#equals(java.lang.Object))) 。`

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