如何在 Java 中将 Object[] 转换为 String[]？
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How to convert the Object[] to String[] in Java?
提问by Questions
I have a question about Java. I have an Object[](Java default, not the user-defined) and I want to convert it to a String[]. Can anyone help me? thank you.
我有一个关于 Java 的问题。我有一个Object[]（Java 默认的，不是用户定义的），我想将它转换为String[]. 谁能帮我？谢谢。
回答by Jigar Joshi
this is conversion
这是转换
for(int i = 0 ; i < objectArr.length ; i ++){
try {
strArr[i] = objectArr[i].toString();
} catch (NullPointerException ex) {
// do some default initialization
}
}
This is casting
这是铸造
String [] strArr = (String[]) objectArr; //this will give you class cast exception
Update:
更新：
Tweak 1
调整 1
String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);
Tweak2
调整2
Arrays.asList(Object_Array).toArray(new String[Object_Array.length]);
Note:That only works if the objects are all Strings; his current code works even if they are not
注意：只有当对象都是字符串时才有效；他当前的代码有效，即使它们不是
forTweak1 :only on Java 1.6 and above
forTweak1 ：仅适用于 Java 1.6 及更高版本
回答by aioobe
Simply casting like this String[] strings = (String[]) objectArray;probably won't work.
像这样简单地投射String[] strings = (String[]) objectArray;可能行不通。
Try something like this:
尝试这样的事情：
public static String[] asStrings(Object... objArray) {
String[] strArray = new String[objArray.length];
for (int i = 0; i < objArray.length; i++)
strArray[i] = String.valueOf(objArray[i]);
return strArray;
}
You could then use the function either like this
然后您可以像这样使用该功能
Object[] objs = { "hello world", -1.0, 5 };
String[] strings = asStrings(objs);
or like this
或者像这样
String[] strings = asStrings("hello world", -1.0, 5);
回答by bdhar
I guess you could also use System.arraycopy
我想你也可以使用System.arraycopy
System.arraycopy(objarray, 0, strarray, 0, objarray.length);
provided, strarrayis of the length objarray.lengthand objarray contain only strings. Or it would throw ArrayStoreException. See aioobe's comment.
提供strarray的长度objarray.length和 objarray 只包含字符串。否则它会抛出 ArrayStoreException。请参阅 aioobe 的评论。
回答by nanda
I think this is the simplest way if all entries in objectArr are String:
如果 objectArr 中的所有条目都是字符串，我认为这是最简单的方法：
for(int i = 0 ; i < objectArr.length ; i ++){
strArr[i] = (String) objectArr[i];
}
