ishaD05
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pm | Java Generics (7th Sep 23 at 6:32am UTC)
Java Generics: Type Safety and Reusability | | Java Generics is a powerful feature introduced in Java 5 that enables you to create classes, interfaces, and methods that operate with types as parameters. This concept allows you to write more flexible and reusable code while ensuring type safety at compile time. Generics are particularly useful in collections, where they help avoid type casting and improve code readability.
Here's a brief overview of how Java Generics work:
Type Parameter: You can define a class or method with one or more type parameters using angle brackets (< >). For example, class MyGenericClass<T> { ... } or public <T> void myGenericMethod(T data) { ... }.
Type Safety: With Generics, the compiler can catch type-related errors at compile time, reducing the likelihood of runtime exceptions. This ensures that the data you work with is of the expected type.
Code Reusability: Generics allow you to write code that works with different types without duplication. For example, you can create a generic List<T> class that can store elements of any type.
Wildcards: Java Generics also support wildcards (?), which allow you to work with an unknown type or a bounded type. Wildcards are useful when you want to write more flexible and reusable methods.
Example of using Generics in a method:
java
Copy code
public static <T> T findMax(T[] array) {
if (array == null || array.length == 0) {
return null;
}
T max = array[0];
for (T item : array) {
if (item.compareTo(max) > 0) {
max = item;
}
}
return max;
}
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