Java Class getComponentType() Method

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Description

The Java Class getComponentType() method returns the Class representing the component type of an array. If this class does not represent an array class this method returns null.

Declaration

Following is the declaration for java.lang.Class.getComponentType() method

public Class<?> getComponentType()

Parameters

NA

Return Value

This method returns the Class representing the component type of this class if this class is an array.

Exception

NA

Getting Component Type of a String Array Example

The following example shows the usage of java.lang.Class.getComponentType() method. In this program, we've created an instance of String Array and then using getClass() method, the class of the instance is retrieved. Using getComponentType(), we've retrieved component type of the class and the result is printed.

package com.tutorialspoint;

public class ClassDemo {

   public static void main(String[] args) {

      String[] arr = new String[] {"admin"};

      // returns the Class representing the component type
      Class arrClass = arr.getClass();
      Class componentType = arrClass.getComponentType();
      if (componentType != null) {
         System.out.println("ComponentType = " + componentType.getName());
      } else {
         System.out.println("ComponentType is null");
      }
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

ComponentType = java.lang.String

Getting Component Type of a List Class Example

The following example shows the usage of java.lang.Class.getComponentType() method. In this program, the class of the List class is retrieved. Using getComponentType(), we've retrieved component type of the class and the result is printed.

package com.tutorialspoint;

import java.util.List;

public class ClassDemo {

   public static void main(String[] args) {

      // returns the Class representing the component type
      Class arrClass = List.class;
      Class componentType = arrClass.getComponentType();
      if (componentType != null) {
         System.out.println("ComponentType = " + componentType.getName());
      } else {
         System.out.println("ComponentType is null");
      }
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

ComponentType is null

Getting Component Type of a Integer Class Example

The following example shows the usage of java.lang.Class.getComponentType() method. In this program, the class of the Integer class is retrieved. Using getComponentType(), we've retrieved component type of the class and the result is printed.

package com.tutorialspoint;

public class ClassDemo {

   public static void main(String[] args) {

      // returns the Class representing the component type
      Class arrClass = Integer.class;
      Class componentType = arrClass.getComponentType();
      if (componentType != null) {
         System.out.println("ComponentType = " + componentType.getName());
      } else {
         System.out.println("ComponentType is null");
      }
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

ComponentType is null