--Technique that allows you to define classes and methods without fixing the data type --Generics methods can be replaced by overloading. However, overloading is smart because you have to define multiple methods, but using generics you only have to define one method.
Sample.java
//Class using generics
class Hello<T> {
T data1;
//constructor
public Hello(T data) {
this.data1 = data;
}
//Method
public T getData1() {
return data1;
}
}
//Calling class
public class Sample {
public static void main(String[] args) {
//String type
Hello<String> s1 = new Hello<>("String");
System.out.println(s1.getData1());
//Integer type
Hello<Integer> s2 = new Hello<>(100);
System.out.println(s2.getData1());
}
}
javac Sample.java
java Sample
String
100
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