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Java reflection get field declaring class


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.

The getDeclaringClass() method of field object is used to get the class declaring the field.

Example

TestClass.java

package com.codesjava;
 
public class TestClass {
	private int defaultLength = 10;
	private int defaultWidth = 5;
	public String testField = "codesjava";
 
	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.lang.reflect.Field;
 
public class ReflectionTest {
	public static void main(String args[]){
		try {
			Class c=Class.forName("com.codesjava.TestClass");  
			Field field = c.getField("testField");
			Class<?> fieldClass = field.getDeclaringClass();
			System.out.println(fieldClass.getCanonicalName());
		} catch (Exception e) {
			e.printStackTrace();
		}  
	}
}

Output

com.codesjava.TestClass
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