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Java Reflection - Class.getConstructor() Examples

Java Reflection Java Java API 

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Class:

java.lang.Class

java.lang.Objectjava.lang.Objectjava.lang.Classjava.lang.Classjava.io.SerializableSerializablejava.lang.reflect.GenericDeclarationGenericDeclarationjava.lang.reflect.TypeTypejava.lang.reflect.AnnotatedElementAnnotatedElementLogicBig

Method:

public Constructor<T> getConstructor(Class<?>... parameterTypes)
                              throws NoSuchMethodException,
                                     SecurityException

This method returns a Constructor object that reflects the specified public constructor of the class represented by this Class object.

Parameters:
parameterTypes - the parameter array
Returns:
the Constructor object of the public constructor that matches the specified parameterTypes


Examples


package com.logicbig.example.clazz;

import java.lang.reflect.Constructor;
import java.math.BigInteger;

public class GetConstructorExample {

    public static void main(String... args) throws NoSuchMethodException {
        Class<MyClass> c = MyClass.class;
        Constructor<MyClass> cons = c.getConstructor();
        System.out.println(cons);

        cons = c.getConstructor(int.class);
        System.out.println(cons);

        cons = c.getConstructor(String.class, BigInteger[].class);
        System.out.println(cons);
    }

    private static class MyClass {
        public MyClass() {
        }

        public MyClass(int x) {
        }

        public MyClass(String s, BigInteger[] integers) {
        }
    }
}

Output

public com.logicbig.example.clazz.GetConstructorExample$MyClass()
public com.logicbig.example.clazz.GetConstructorExample$MyClass(int)
public com.logicbig.example.clazz.GetConstructorExample$MyClass(java.lang.String,java.math.BigInteger[])

See Also