Constructor toGenericString() method in Java with Examples

Last Updated : 29 Oct, 2019

The toGenericString() method of java.lang.reflect.Constructor class is used to return get the generic form of this constructor, i.e. a string representing the details about this constructor including the type parameters. Syntax:

public String toGenericString()

Parameters: This method accepts nothing. Return: This method returns a generic form of this constructor as a string that describes this Constructor along with the type parameters. Below programs illustrate toGenericString() method: Program 1:

Java

// Java program to illustrate
// toGenericString() method

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;

public class GFG {

    public static void main(String[] args)
    {
        // create a class object
        Class classObj = shape.class;

        // get Constructor object
        // array from class object
        Constructor[] cons = classObj.getConstructors();

        // check get string representation
        String str = cons[0].toGenericString();

        // print result
        System.out.println("Constructor : " + str);
    }

    public class shape {

        public shape(Object... objects)
        {
        }
    }
}

Output:

Constructor : public GFG$shape(GFG, java.lang.Object...)

Program 2:

Java

// Java program to illustrate
// toGenericString() method

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;

public class GFG {

    public static void main(String[] args)
    {
        // create a class object
        Class classObj = String.class;

        // get Constructor object
        // array from class object
        Constructor[] cons
            = classObj.getConstructors();

        for (int i = 0; i < cons.length; i++) {

            String str = cons[i].toGenericString();

            // print result
            System.out.println(str);
        }
    }
}

Output:

public java.lang.String(byte[], int, int) public java.lang.String(byte[], java.nio.charset.Charset) public java.lang.String(byte[], java.lang.String) throws java.io.UnsupportedEncodingException public java.lang.String(byte[], int, int, java.nio.charset.Charset) public java.lang.String(byte[], int, int, java.lang.String) throws java.io.UnsupportedEncodingException public java.lang.String(java.lang.StringBuilder) public java.lang.String(java.lang.StringBuffer) public java.lang.String(byte[]) public java.lang.String(int[], int, int) public java.lang.String() public java.lang.String(char[]) public java.lang.String(java.lang.String) public java.lang.String(char[], int, int) public java.lang.String(byte[], int) public java.lang.String(byte[], int, int, int)

References: https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Constructor.html#toGenericString()