Generic classes/interfaces:
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.
Generics class example with two parameters:
GenericsTest.java
/**
* This class is used to show the use generics
* class with two parameters.
* @author javawithease
*/
class Test<T, U> {
private T itemT;
private U itemU;
public Test(T itemT, U itemU){
this.itemT = itemT;
this.itemU = itemU;
}
public T getItemT() {
return itemT;
}
public void setItemT(T itemT) {
this.itemT = itemT;
}
public U getItemU() {
return itemU;
}
public void setItemU(U itemU) {
this.itemU = itemU;
}
public void showItemDetails(){
System.out.println("Value of the itemT: "
+ itemT);
System.out.println("Type of the itemT: "
+ itemT.getClass().getName());
System.out.println("Value of the itemU: "
+ itemU);
System.out.println("Type of the itemU: "
+ itemU.getClass().getName());
}
}
public class GenericsTest {
public static void main(String args[]){
//String type test
Test<String, Integer> test =
new Test<String, Integer>("Test String.", 100);
test.showItemDetails();
}
} |
Output:
Value of the itemT: Test String.
Type of the itemT: java.lang.String
Value of the itemU: 100
Type of the itemU: java.lang.Integer |
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