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import java.util.*;

import java.util.concurrent.ConcurrentHashMap;

import java.util.stream.Collectors;

import java.util.stream.IntStream;

import static java.util.stream.Collectors.*;

import static javax.swing.UIManager.put;

/**

* This example shows how a Java 7 BiFunction lambda can be used to

* replace all the values of all keys in a ConcurrentHashMap. It also

* contrasts the Java 8 BiFunction with a conventional Java 7 solution

* using a foreach loop.

*/

public class ex4 {

static public void main(String[] argv) {

// Create a map that associates Stooges with IQ points.

Map<String, Integer> iqMap =

new ConcurrentHashMap<String, Integer>() {

{

put("Larry", 100);

put("Curly", 90);

put("Moe", 110);

}

};

System.out.println(iqMap);

// Replace all values of all keys using a Java 8 BiFunction

// lambda.

iqMap.replaceAll((k, v) -> v - 50);

System.out.println(iqMap);

// Replace all values of all keys using a Java 7 foreach loop.

for (Map.Entry<String, Integer> entry : iqMap.entrySet())

entry.setValue(entry.getValue() - 50);

System.out.println(iqMap);

}

}