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Java reflection get class object


We can get class object in java by using following approaches:

  • forName() method of Class class
  • getClass() method of Object class
  • the .class syntax

 

Note: When using forName() method we must pass the fully qualified class name.

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;
 
public class ReflectionTest {
	public static void main(String args[]){
		try {
			//Using forName() method
			Class c=Class.forName("com.codesjava.Rectangle");  
			System.out.println(c.getName());
 
			//Using getClass() method of Object class
			Rectangle object = new Rectangle();
			c= object.getClass();
			System.out.println(c.getName());
 
			//.class syntax
			c = Rectangle.class;
			System.out.println(c.getName());
		} catch (Exception e) {
			e.printStackTrace();
		}  
	}
}

Output

com.codesjava.Rectangle
com.codesjava.Rectangle
com.codesjava.Rectangle
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