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Do we need forward declarations in Java?
Forward declarations means the declaration of a method or variable prior to its implementation. Such declaration is necessary in C/C++ programming language in order to be able to use a variable or object before its implementation. In case, if we want to use a library code, then we need to create its header file and use it. But this is not a case in Java.
Java allows using a variable, class prior to its declaration and implementation.
Java allows using libraries code without any need of header files.
Following example showcases the same. Here we have used a class object before its declaration.
Example
public class Tester{
public static void main(String args[]) {
Test t = new Test();
t.display();
}
}
class Test {
public void display() {
System.out.println("Test");
}
}Output
Test
Updated on: 21-Jun-2020
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