Home » Java programming language

Java Class class isAssignableFrom() method with example

Class class isAssignableFrom() method: Here, we are going to learn about the isAssignableFrom() method of Class class with its syntax and example.
Submitted by Preeti Jain, on November 02, 2019

Class class isAssignableFrom() method

  • isAssignableFrom() method is available in java.lang package.
  • isAssignableFrom() method is used to check whether the class or an interface denoted by this Class object is either the same as, or the Class object is a superclass or superinterface.
  • isAssignableFrom() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • isAssignableFrom() method may throw an exception at the time of assigning an object.
    NullPointerException: In the exception, when the given class exists null.

Syntax:

    public boolean isAssignableFrom(Class class);

Parameter(s):

  • Class class – represents the Class object to be determined.

Return value:

The return type of this method is boolean, it returns a boolean value based on the following cases,

  • It returns true, when the object of class is assignable to object of this Class.
  • It returns false, when the object of class is not assignable to object of this Class.

Example:

// Java program to demonstrate the example 
// of boolean isAssignableFrom(Class class) method of Class 

public class Parent {
    public static void main(String[] args) throws Exception {
        // Create and Return Parent Class object
        Parent p = new Parent();
        Class cl1 = p.getClass();

        // Create and Return Child Class object
        Child ch = new Child();
        Class cl2 = ch.getClass();

        // We are checking the given Parent class is 
        // Assignable from Child Class
        boolean child = cl2.isAssignableFrom(cl1);
        System.out.println("Is" + " " + cl1.getSimpleName() + " " + "Assignable from Child: " + " " + child);

        // We are checking the given Child class is 
        // Assignable from Parent Class
        boolean parent = cl1.isAssignableFrom(cl2);
        System.out.println("Is" + " " + cl2.getSimpleName() + " " + "Assignable from Parent: " + " " + parent);
    }
}

class Child extends Parent {
    public Child() {
        // Default Constructor with blank implementation
    }
}

Output

Is Parent Assignable from Child:  false
Is Child Assignable from Parent:  true





Comments and Discussions

Ad: Are you a blogger? Join our Blogging forum.




Languages: » C » C++ » C++ STL » Java » Data Structure » C#.Net » Android » Kotlin » SQL
Web Technologies: » PHP » Python » JavaScript » CSS » Ajax » Node.js » Web programming/HTML
Solved programs: » C » C++ » DS » Java » C#
Aptitude que. & ans.: » C » C++ » Java » DBMS
Interview que. & ans.: » C » Embedded C » Java » SEO » HR
CS Subjects: » CS Basics » O.S. » Networks » DBMS » Embedded Systems » Cloud Computing
» Machine learning » CS Organizations » Linux » DOS
More: » Articles » Puzzles » News/Updates


© https://www.includehelp.com some rights reserved.