How to convert the a java type to java string []?

Question

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[]).

Answer 1

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;

Answer 2

1. What you call 'convert' is actually called 'cast'.
2. Casting variable has no effect on object itself. In other words, (String) x is not equivalent of x.toString()

3. 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

Answer 3

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);

Answer 4

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)};