比较两个对象并检查 null [英] Compare two objects with a check for null
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问题描述
JDK 中是否有一种方法可以比较两个对象的相等性,并考虑空值?像这样:
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);
}
自己编写这个方法似乎很愚蠢,因为我认为它必须已经存在于某处.
It seems silly to write this method myself since I would think that it has to exist already somewhere.
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
.
它有一个专门用于此的方法:Objects.equals(Object a, Object b)
It has a method exactly for this: Objects.equals(Object a, Object b)
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