为什么打印 Java 数组会显示内存位置
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Why does printing a Java array show a memory location
提问by dannyfrenton
int[] answer= new int[map.size()];
HashMap<String, Integer> map = new HashMap<String, Integer>();
for (int j=0; j<answer.length;j++){
int x=map.get(keys.get(j));
answer[j]=x;
}
return answer
When I print xusing System.out.println(x)in the loop, I get values of 1, 2, 3but when I return the answer and print it, I get [I@9826ac5. Any idea why?
当我在循环中打印xusingSystem.out.println(x)时，我得到的值为 ，1, 2, 3但是当我返回答案并打印它时，我得到[I@9826ac5. 知道为什么吗？
回答by Dave
I[is kind of the "class type" for an array of integer. Printing out this array itself will print the class type @then a short hex string because that's the hash code of the array. It's the same as something you've probably seen like Object@0b1ac20. This is implemented as the default toString()for Object.
I[是整数数组的“类类型”。打印出这个数组本身将打印类类型，@然后是一个简短的十六进制字符串，因为这是数组的哈希码。这与您可能见过的相同Object@0b1ac20。这是作为默认toString()的Object。
Maybe you want to return a specific element of the array or print the whole array using a for loop?
也许您想返回数组的特定元素或使用 for 循环打印整个数组？
回答by redsaz
Long story short, you can't easily print an array in java. Do this:
长话短说，您不能在 java 中轻松打印数组。做这个：
System.out.println( Arrays.toString(answer) );
回答by Jigar Joshi
because that is how array's toString()method is implemented
因为这就是数组toString()方法的实现方式
