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What are the uses of generic collections in Java?
The generic collections are introduced in Java 5 Version. The generic collections disable the type-casting and there is no use of type-casting when it is used in generics. The generic collections are type-safe and checked at compile-time. These generic collections allow the datatypes to pass as parameters to classes. The Compiler is responsible for checking the compatibility of the types.
Syntax
class<type>, interface<type>
Type safety
Generics allows a single type of object.
List list = new ArrayList(); // before generics
list.add(10);
list.add("100");
List<Integer> list1 = new ArrayList<Integer>(); // adding generics
list1.add(10);
list1.add("100"); // compile-time error.Type Casting
No need for type-casting while using generics.
List<String> list = new ArrayList<String>();
list.add("Adithya");
String str = list.get(0); // no need of type-castingCompile-time
The errors are checked at compile-time in generics.
List list = new ArrayList(); // before generics
list.add(10);
list.add("100");
List<Integer> list1 = new ArrayList<Integer>(); // adding generics
list1.add(10);
list1.add("100");// compile-time error
Updated on: 03-Jul-2020
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