The Java Generics programming is introduced in J2SE 5 to deal with type-safe objects.
Advantage of Java Generics
There are mainly 3 advantages of generics. They are as follows:
1) Type-safety : We can hold only a single type of objects in generics. It doesn’t allow to store other objects.
2) Type casting is not required: There is no need to typecast the object.
Before Generics, we need to type cast.
List list = new ArrayList(); list.add("CoderzHeaven"); String s = (String) list.get(0); //typecasting |
After Generics, we don’t need to typecast the object.
List<String> list = new ArrayList<String>(); list.add("hello"); String s = list.get(0); |
3) Compile-Time Checking: It is checked at compile time so problem will not occur at runtime. The good programming strategy says it is far better to handle the problem at compile time than runtime.
List<String> list = new ArrayList<String>(); list.add("CoderzHeaven"); list.add(23); //Compile Time Error |
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