漂亮的打印数组对象，而不是对象数组？
所以，我已经发现了
Arrays.toString(arr);
所以不要让我指出 这个问题。
我的问题有点不同。在这种情况下，我没有指向相关数组的本机数组指针。我将它作为对象指针，它可以是任何类型的数组（原始或其他类型）。在这种情况下，我可以通过将 Object 指针转换为 Object[] 来使用上面的 toString() 方法。但是，如果指针是原始数组，它将引发运行时异常并崩溃。所以？
示例：
double test[] = {1, 2, 3, 4};
Object t = test;
// Now how do I pretty print t as an array with no access to test?
我用这个解决了我的问题：
public String unkObjectToString(Object o) {
if(!o.getClass().isArray()) return o.toString();
int len = Array.getLength(o);
String ret = "[";
for(int i = 0; i < len; i++) {
Object q = Array.get(o, i);
ret += unkObjectToString(q);
if(i == len - 1)
ret += "]";
else
ret += ", ";
}
return ret;
}
So, I've already discovered
Arrays.toString(arr);
So don't point me to this question.
My problem is just a tiny bit different. In this case, I don't have a native array pointer to the array in question. I have it as an Object pointer, and it could be an array of any type (primitive or otherwise). In this case, I can use the above toString() method by casting the Object pointer to Object[]. However, if the pointer is a primitive array, it will throw a runtime exception and crash. So?
Example:
double test[] = {1, 2, 3, 4};
Object t = test;
// Now how do I pretty print t as an array with no access to test?
I solved my problem with this:
public String unkObjectToString(Object o) {
if(!o.getClass().isArray()) return o.toString();
int len = Array.getLength(o);
String ret = "[";
for(int i = 0; i < len; i++) {
Object q = Array.get(o, i);
ret += unkObjectToString(q);
if(i == len - 1)
ret += "]";
else
ret += ", ";
}
return ret;
}
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你必须测试并投射。
您可以通过反射来完成此操作，但最终不会更干净，尽管会少几行代码。
You have to test and cast.
You could do this via reflection, but it would not be any cleaner in the end, although it would be a few lines of code less.
ArrayUtils.toString(arrayObj)(commons-lang) -完全符合您的要求（还处理多维数组）。只需下载 commons-lang jar 并将其添加到您的类路径中即可。ArrayUtils.toString(arrayObj)(commons-lang) - does exactly what you want (also handles multi-dimensional arrays). Simply download the commons-lang jar and add it to your classpath.