Explain var keyword in Java.

var keyword is introduced in Java 10 to enhance the Java Language to extend type inference to declarations of local variables with initializers.

var map = new HashMap<String, Integer>();

var is not a keyword in Java, but rather it is a reserved type name. var cannot be used for fields, return types, class names, or interface names.

var can only be used for implicit type inference in the following contexts.

• local variables with initializers.
• indexes in the enhanced for-loop.
• locals declared in a traditional for-loop.

Since var is a reserved type name, it can still be used for package name, method name, and variable name along with its new type-interference role. For example, the following are all examples of valid uses of var in Java.

var map = new HashMap<String, Integer>();
var k= 0;
var var = 10;
for (var i = 0; i < 100; i++) { /* ... */ }
public int var() { return -1; }
package var;

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