I want to ask a Java String[] question. In the java, if a variable convents to another, it can add the (String), (int), (double),... before the variable in the left hand side. However, is there something like (String[]) in Java as I want to convent the variable into (String[]).
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4 Answers
Yes, there is (String[]) which will cast into an array of String.
But to be able to cast into a String array, you must have an array of a super type of String or a super type of array (only Object, Serializable and Cloneable).
So only these casts will work :
String[] sArray = null;
Object[] oArray = null;
Serializable[] serArray = null;
Comparable[] compArray = null;
CharSequence[] charSeqArray = null;
Object object = null;
Serializable serializable = null;
Cloneable cloneable = null;
sArray = (String[]) oArray;
sArray = (String[]) serArray;
sArray = (String[]) compArray;
sArray = (String[]) charSeqArray;
sArray = (String[]) object;
sArray = (String[]) serializable;
sArray = (String[]) cloneable;
1 Comment
Colin Hebert
@Carlos Heuberger, I knew I forgot something, I'll edit the answer ;)
- What you call 'convert' is actually called 'cast'.
- Casting variable has no effect on object itself. In other words,
(String) xis not equivalent ofx.toString() String[]is a perfectly normal Java class, just like any other. Try this, for example:System.out.println(String[].class.getName());
You can also check 'Casting Objects' section in Java tutorial:
http://download.oracle.com/javase/tutorial/java/IandI/subclasses.html
Comments
What you want is probably not casting to String[], because your object is not a String[] but something else. What I think you are looking for would be something like this:
int someInt = 1;
long someLong = 2;
String[] strings = new String[] {
Integer.toString(someInt),
Long.toString(someLong)};
Comments
Yes, ofcourse.
Example:
String s1 = "test1";
String s2 = "test2";
Object obj [] = new Object[]{s1,s2};
String s[] = (String[]) obj;
System.out.println(s1);
System.out.println(s2);
1 Comment
Buhake Sindi
String s = (String[]) obj; will crash, you cannot convert String[] to String...and why are you printing s1 and s2?