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Java reflection get implemented interfaces


The java.lang.Class provides the methods to examine the runtime properties of the object including its members and type information. For every type of object, the JVM instantiates an immutable instance of java.lang.Class. Using reflection, we can get the metadata of a class at run time.

Following two methods are used to get the implemented interfaces in java:

  • getGenericInterfaces() method is used to get the array of interfaces implemented by the class with generic type information.
  • getInterfaces() method is used to get the array of all the implemented interfaces.

Example

Shape.java

package com.codesjava;
 
public interface Shape {
	public void drawShape(String color);
}

Rectangle.java

package com.codesjava;
 
public class Rectangle implements Shape{
	private int defaultLength = 10;
	private int defaultWidth = 5;
 
	@Override
	public void drawShape(String color) {
		System.out.println("Rectangle create with following properties: ");
		System.out.println("Length: " + defaultLength);
		System.out.println("Width: " + defaultWidth);
	}
 
}

ReflectionTest.java

package com.codesjava;
 
import java.util.Arrays;
 
public class ReflectionTest {
	public static void main(String args[]){
		try {
			Class c=Class.forName("com.codesjava.Rectangle");  
			System.out.println(Arrays.toString(c.getInterfaces()));
		} catch (Exception e) {
			e.printStackTrace();
		}  
	}
}

Output

[interface com.codesjava.Shape]
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