Modifier isAbstract(mod) method in Java with Examples

The isAbstract(mod) method of java.lang.reflect.Modifier is used to check if the integer argument includes the abstract modifier or not. If this integer parameter represents abstract type Modifier then method returns true else false.

Syntax:

public static boolean isAbstract(int mod)

Parameters: This method accepts a integer names as mod represents a set of modifiers.

Return: This method returns true if mod includes the abstract modifier; false otherwise.

Below programs illustrate isAbstract() method:
Program 1:

// Java program to illustrate isAbstract() method

import java.lang.reflect.*;

public class GFG {

    public static void main(String[] args)
    {

        // get Method class object
        Method[] methods
            = Shape.class.getMethods();

        // get Modifier Integer value
        int mod = methods[0].getModifiers();

        // check Modifier is Abstract or not
        boolean result = Modifier.isAbstract(mod);

        System.out.println("Mod integer value "
                           + mod + " is Abstract : "
                           + result);
    }

    abstract class Shape {

        public abstract String drawShape();
    }
}

Output:

Mod integer value 1025 is Abstract : true

Program 2:

// Java program to illustrate isAbstract()

import java.lang.reflect.*;

public class GFG {

    public static void main(String[] args)
    {

        // get Method class object
        Method[] methods = Numbers.class.getMethods();

        // get Modifier Integer value
        int mod1 = methods[0].getModifiers();
        int mod2 = methods[1].getModifiers();

        // check Modifiers are Abstract or not
        boolean result1 = Modifier.isAbstract(mod1);
        boolean result2 = Modifier.isAbstract(mod2);

        // print results
        System.out.println("Mod integer value "
                           + mod1 + " for method "
                           + methods[0].getName()
                           + " is Abstract : "
                           + result1);

        System.out.println("Mod integer value "
                           + mod2 + " for method"
                           + methods[1].getName()
                           + " is Abstract : "
                           + result2);
    }

    // sample abstract class
    abstract class Numbers {

        public abstract int initializeNumber();
        public final int declareNumbers()
        {
            return 0;
        };
    }
}

Output:

Mod integer value 1025 for method initializeNumber is Abstract : true
Mod integer value 17 for methoddeclareNumbers is Abstract : false

References: https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Modifier.html#isAbstract(int)