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Introduction
The java.lang.reflect.Constructor class provides information about, and access to, a single constructor for a class. Constructor permits widening conversions to occur when matching the actual parameters to newInstance() with the underlying constructor”s formal parameters, but throws an IllegalArgumentException if a narrowing conversion would occur.
Class declaration
Following is the declaration for java.lang.reflect.Constructor class −
public final class Constructor<T>
extends AccessibleObject
implements GenericDeclaration, Member
Class methods
| Sr.No. | Method & Description |
|---|---|
| 1 | boolean equals(Object obj)
Compares this Constructor against the specified object. |
| 2 | <T extends Annotation> T getAnnotation(Class<T> annotationClass)
Returns this element”s annotation for the specified type if such an annotation is present, else null. |
| 3 | Annotation[] getDeclaredAnnotations()
Returns all annotations that are directly present on this element. |
| 4 | Class<T> getDeclaringClass()
Returns the Class object representing the class that declares the constructor represented by this Constructor object. |
| 5 | Class<?>[] getExceptionTypes()
Returns an array of Class objects that represent the types of exceptions declared to be thrown by the underlying constructor represented by this Constructor object. |
| 6 | Type[] getGenericExceptionTypes()
Returns an array of Type objects that represent the exceptions declared to be thrown by this Constructor object. |
| 7 | Type[] getGenericParameterTypes()
Returns an array of Type objects that represent the formal parameter types, in declaration order, of the method represented by this Constructor object. |
| 8 | int getModifiers()
Returns the Java language modifiers for the constructor represented by this Constructor object, as an integer. |
| 9 | String getName()
Returns the name of this constructor, as a string. |
| 10 | Annotation[][] getParameterAnnotations()
Returns an array of arrays that represent the annotations on the formal parameters, in declaration order, of the method represented by this Constructor object. |
| 11 | Class<?>[] getParameterTypes()
Returns an array of Class objects that represent the formal parameter types, in declaration order, of the constructor represented by this Constructor object. |
| 12 | int hashCode()
Returns a hashcode for this Constructor. |
| 13 | boolean isSynthetic()
Returns true if this constructor is a synthetic constructor; returns false otherwise. |
| 14 | boolean isVarArgs()
Returns true if this constructor was declared to take a variable number of arguments; returns false otherwise. |
| 15 | T newInstance(Object… initargs)
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor”s declaring class, with the specified initialization parameters. |
| 16 | String toGenericString()
Returns a string describing this Constructor, including type parameters. |
| 17 | String toString()
Returns a string describing this Constructor. |
Methods inherited
This class inherits methods from the following classes −
- java.lang.reflect.AccessibleObject
- java.lang.Object
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