如何在Java中的Object []和接口（IProject []）之间进行转换？

问题描述

我在Java中有一个Object []，并希望将它转换为IProject []，这是一个Java接口（org.eclipse.core.resources.IProject），以便为eclipse编写一个插件。

这是可能吗？

关心

解决方案

您不能转换数组本身 - 数组知道其插槽的类型，因此您不能只投掷一个 Object [] 到 IProject [] 的表达式，即使数组恰好只包含 IProject 的实例（除非你发生要有一个类型为 Object [] 的变量，它实际上指向一个 IProject [] 的实例）。

相反，您需要使用相同的内容创建一个新数组：

  Object [] objects; 
 IProject [] projects = new IProject [objects.length]; 
 System.arraycopy（objects，0，projects，0，objects.length）; 
  

数组存储是动态类型检查的，所以如果你的 Object [] 包含不是 IProject 的实例的任何对象，您将得到一个 ArrayStoreException 。

I have an Object[] in Java and want to convert it to IProject[], which is a Java interface (org.eclipse.core.resources.IProject), in order to write a plugin for eclipse.

Is this possible?

Regards

解决方案

You can't convert the array itself - arrays know the type of their slots, so you can't just cast an instance of Object[] to an expression of type IProject[], even if the array happens to contain only instances of IProject (unless you happen to have a variable of type Object[] which actually points to an instance of IProject[]).

Instead, you'll need to make a new array with the same contents:

Object[] objects;
IProject[] projects = new IProject[objects.length];
System.arraycopy(objects, 0, projects, 0, objects.length);

Array stores are dynamically type-checked, so if your Object[] contains any objects which are not instances of IProject, you'll get an ArrayStoreException.

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