https://projectlombok.org: Spice up your java: Automatic Resource Management, automatic generation of getters, setters, equals, hashCode and toString, and more! 
/*
 * Copyright (C) 2010-2017 The Project Lombok Authors.
 * 
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 * of this software and associated documentation files (the "Software"), to deal
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 */
package lombok;


Use val as the type of any local variable declaration (even in a for-each statement), and the type will be inferred from the initializing expression. For example: val x = 10.0; will infer double, and val y = new ArrayList<String>(); will infer ArrayList<String>. The local variable will also be made final. 
 Note that this is an annotation type because val x = 10; will be desugared to @val final int x = 10; 

Complete documentation is found at the project lombok features page for @val.

/**
 * Use {@code val} as the type of any local variable declaration (even in a for-each statement), and the type will be inferred from the initializing expression.
 * For example: {@code val x = 10.0;} will infer {@code double}, and {@code val y = new ArrayList<String>();} will infer {@code ArrayList<String>}. The local variable
 * will also be made final.
 * <p>
 * Note that this is an annotation type because {@code val x = 10;} will be desugared to {@code @val final int x = 10;}
 * <p>
 * Complete documentation is found at <a href="https://projectlombok.org/features/val">the project lombok features page for &#64;val</a>.
 */
public @interface val {
}