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Java Reflection - Constructor.canAccess() Examples

Java Reflection Java Java API 

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Class:

java.lang.reflect.Constructor

java.lang.Objectjava.lang.Objectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AnnotatedElementAnnotatedElementjava.lang.reflect.Executablejava.lang.reflect.Executablejava.lang.reflect.MemberMemberjava.lang.reflect.GenericDeclarationGenericDeclarationjava.lang.reflect.Constructorjava.lang.reflect.ConstructorLogicBig

Method:

public final boolean canAccess(Object obj)

This method tests if the caller can access this constructor. For constructors obj must be null.


Examples


package com.logicbig.example.constructor;

import java.lang.reflect.Constructor;

public class CanAccessExample {

    private CanAccessExample() {}

    public static void main(String... args) throws NoSuchMethodException {
        Constructor<CanAccessExample> cons = CanAccessExample.class.getDeclaredConstructor();
        boolean b = cons.canAccess(null);
        System.out.println(b);
    }
}

Output

true




package com.logicbig.example.constructor;

import java.lang.reflect.Constructor;

public class CanAccessExample2 {

    private static class Test {
        private Test() {}
    }

    public static void main(String... args) throws NoSuchMethodException {
        Constructor<Test> cons = Test.class.getDeclaredConstructor();
        boolean b = cons.canAccess(null);
        System.out.println(b);

        boolean b1 = cons.trySetAccessible();
        System.out.println(b1);

        boolean b2 = cons.canAccess(null);
        System.out.println(b2);
    }
}

Output

false
true
true




package com.logicbig.example.constructor;

import java.lang.reflect.Constructor;

public class CanAccessExample3 {
    public class Test {
        public Test() {}
    }

    public static void main(String... args) throws NoSuchMethodException {
        //inner class has an implicit arg of outer class
        Constructor<Test> cons = Test.class.getDeclaredConstructor(CanAccessExample3.class);
        boolean b = cons.canAccess(null);
        System.out.println(b);
    }
}

Output

true

See Also