What Is A Diamond Operator?

1.	What Is A Diamond Operator?
Answer» Diamond operator let the compiler infer the TYPE arguments for the generic classes. It is added in Java 7. As Example - Before JDK7 if we had to define a Map using STRING as both Key and VALUE we had to WRITE it like this - Map<String, String&GT; cityMap = new HashMap<String, String>(); In Java SE 7, you can substitute the parameterized type of the constructor with an empty set of type parameters (<>) known as diamond operator. Map<String, String> cityMap = new HashMap<>(); Diamond operator let the compiler infer the type arguments for the generic classes. It is added in Java 7. As Example - Before JDK7 if we had to define a Map using String as both Key and Value we had to write it like this - Map<String, String> cityMap = new HashMap<String, String>(); In Java SE 7, you can substitute the parameterized type of the constructor with an empty set of type parameters (<>) known as diamond operator. Map<String, String> cityMap = new HashMap<>();

Answer»

Diamond operator let the compiler infer the TYPE arguments for the generic classes. It is added in Java 7.

As Example - Before JDK7 if we had to define a Map using STRING as both Key and VALUE we had to WRITE it like this -

Map<String, String&GT; cityMap = new HashMap<String, String>();

In Java SE 7, you can substitute the parameterized type of the constructor with an empty set of type parameters (<>) known as diamond operator.

Map<String, String> cityMap = new HashMap<>();

Diamond operator let the compiler infer the type arguments for the generic classes. It is added in Java 7.

As Example - Before JDK7 if we had to define a Map using String as both Key and Value we had to write it like this -

Map<String, String> cityMap = new HashMap<String, String>();

In Java SE 7, you can substitute the parameterized type of the constructor with an empty set of type parameters (<>) known as diamond operator.

Map<String, String> cityMap = new HashMap<>();

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