比较两个Java对象与检查为null [英] Compare two Java objects with a check for null

问题描述

我觉得这样一个新手问这个问题，但是在JDK中有一个方法比较两个对象的相等性，占空的？类似这样：

I feel like such a novice for asking this question, but is there a method in the JDK that compares two objects for equality, accounting for nulls? Something like this:

public static boolean equals(Object o1, Object o2)
{
    if (o1 == null)
    {
        return o2 == null; // Two nulls are considered equal
    }
    else if (o2 == null)
    {
        return false;
    }

    return o1.equals(o2);
}

自己写这个方法似乎很愚蠢，因为我认为它。

It seems silly to write this method myself since I would think that it has to exist already somewhere.

更新：删除了泛型（类型参数），因为在这种情况下没有添加任何值。

Update: Removed the generics (type parameter) since it did not add any value in this case.

推荐答案

Java 7.0添加了一个新的方便的类： Objects 。

Java 7.0 added a new handy class: Objects.

对于此： Objects.equals（Object a，Object b）

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