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What is Reflection in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 10/10 Helpfulness 2/10

answer What is Reflection in Java?

What is Reflection in Java?

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Reflection is Java language's ability to inspect and dynamically call

classes, methods, attributes etc. at Runtime. It helps in examining or

modifying the Runtime behavior of a class at Runtime.

class Test {
    private String s;
    public Test() { s = "GeeksforGeeks"; }
    public void method1()
    {
        System.out.println("The string is " + s);
    }
    public void method2(int n)
    {
        System.out.println("The number is " + n);
    }
    private void method3()
    {
        System.out.println("Private method invoked");
    }
}
class GFG {
    public static void main(String args[]) throws Exception
    {
        Test obj = new Test();
        Class cls = obj.getClass();
        System.out.println("The name of class is "
                           + cls.getName());
        Constructor constructor = cls.getConstructor();
        System.out.println("The name of constructor is "
                           + constructor.getName());
        System.out.println(
            "The public methods of class are : ");
        Method[] methods = cls.getMethods();
        for (Method method : methods)
            System.out.println(method.getName());
        Method methodcall1
            = cls.getDeclaredMethod("method2", int.class);
        methodcall1.invoke(obj, 19);
        Field field = cls.getDeclaredField("s");
        field.setAccessible(true);
        field.set(obj, "JAVA");
        Method methodcall2
            = cls.getDeclaredMethod("method1");
        methodcall2.invoke(obj);
        Method methodcall3
            = cls.getDeclaredMethod("method3");
        methodcall3.setAccessible(true);
        methodcall3.invoke(obj);
    }
}

https://www.geeksforgeeks.org/reflection-in-java/

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java reflection

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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