I'm creating a function in Java that returns the type of the variable and as such, since I'm trying to figure out its type, I have no way of telling the function what type of variable to expect.
What I'm trying to build is the following:
public String getVarType(AnyType var){
if (var instanceof ArrayList) {
return "ArrayList";
}
if (var instanceof String) {
return "String";
}
}
How can I set the parameters for the function to expect any type?
If you are wanting to know the type of the object, work with Object . After all, every Java class is subclassed from Object implicitly. To check the object type, you can create a method for this:
public String getObjectName(Object o){
return o.getClass().getSimpleName();
}
In which to be called will result in:
getObjectName(new ArrayList()); // ArrayList
getObjectName(new String()); //String
String abc = "abc";
getObjectName(abc); // String
There is one, however, if you try to use the above method with a int a = 10; variable, the return will be 10 . For what I researched, I can not get the primitive data type for obvious reasons.
If your application needs to do this comparison, you can work with numeric classes ( Integer to int , Double to double , etc ...), in those cases the above method would work. / p>
Integer integer = 10;
System.out.println(getObjectType(integer)); // Integer
You can do this.
public String getVarType(String var){
return "String";
}
public String getVarType(ArrayList var){
return "ArrayList";
}