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Generics class example


Generics class in java and generics interface in java:

Generic classes/interfaces have the class name followed by a type parameter section. Type parameter section of can have one or more type parameters separated by commas. These classes/interfaces are known as parameterized classes/interfaces.

Example:

GenericsTest.java

/**
 * This class is used to show the use generics class.
 * @author codesjava
 */
class Test<T> {
	  private T item;
 
	  public Test(T item){
		  this.item = item;
	  }
 
	  public T getItem() {
		  return item;
	  }
 
	  public void setItem(T item) {
		this.item = item;
	  }	 
 
	  public void showItemDetails(){
		  System.out.println("Value of the item: " 
				  + item);
		  System.out.println("Type of the item: " 
				  + item.getClass().getName());
	  }
}
 
public class GenericsTest {	
	public static void main(String args[]){
		//String type test
		Test<String> test1 = 
			new Test<String>("Test String.");
		test1.showItemDetails();
 
		//Integer type test
		Test<Integer> test2 = 
			new Test<Integer>(100);
		test2.showItemDetails();		
	}
}

Output:

Value of the item: Test String.
Type of the item: java.lang.String
Value of the item: 100
Type of the item: java.lang.Integer

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