未经检查的强制转换泛型

发布于 2024-11-04 16:56:23 字数 611 浏览 3 评论 0原文

在我的代码中我有 <代码> 私有 E[] arrCirc; 在我的构造函数中，我有 arrCirc = (E[]) new Object[capacity]; 但是当我尝试编译它时，我收到警告：

[unchecked] unchecked cast
发现：java.lang.Object
必需：E[]

错误，我不知道为什么。

public class Array12<E> implements LimCapList<E>{

  private int size = 0;
  private int capacity = 0;
  private int front;
  private int back;
  private E[] arrCirc;

  public Array12(int capacity){
     if( capacity <= 0)
       throw new IllegalArgumentException();
     arrCirc = (E[]) new Object[capacity];
     front = 0;
     back = 1;
  }

原文

In my code I have
private E[] arrCirc;
and in my constructor I have arrCirc = (E[]) new Object[capacity];
but when I try to compile it I get an warning:

[unchecked] unchecked cast
found : java.lang.Object
required: E[]

Error and I'm not sure why.

public class Array12<E> implements LimCapList<E>{

  private int size = 0;
  private int capacity = 0;
  private int front;
  private int back;
  private E[] arrCirc;

  public Array12(int capacity){
     if( capacity <= 0)
       throw new IllegalArgumentException();
     arrCirc = (E[]) new Object[capacity];
     front = 0;
     back = 1;
  }

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黑白记忆 2024-11-11 16:56:23

你能让你的 arrCirc 类型为 Object[] （像大多数openJDK 中的通用集合吗）？

（并执行 arrCirc = new Object[capacity]; ）

否则对于警告，您可以使用 SupressWarning。

        @SuppressWarnings("unchecked")
        public Array12(int capacity){
             if( capacity <= 0)
               throw new IllegalArgumentException();
             arrCirc = (E[]) new Object[capacity];
             front = 0;
             back = 1;
          }

Can you make your arrCirc of type Object[] (like most generic collections in openJDK do) ?

( and do arrCirc = new Object[capacity]; )

Otherwise for the warning, you can just use SupressWarning.

        @SuppressWarnings("unchecked")
        public Array12(int capacity){
             if( capacity <= 0)
               throw new IllegalArgumentException();
             arrCirc = (E[]) new Object[capacity];
             front = 0;
             back = 1;
          }

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