Java Map replaceAll Example

gistfile1.txt

import java.util.HashMap;
import java.util.Map;

public class MapLamdaTest {

    public static void main(String[] args) {
        Map<String, Boolean> booleanMap = new HashMap<String, Boolean>(2);
        booleanMap.put("A", Boolean.TRUE);
        booleanMap.put("B", Boolean.FALSE);
        booleanMap.put("C", Boolean.TRUE);
        
        System.out.println("Hashmap created, here are the values");
        
        // Print out the map
        booleanMap.forEach((k, v) -> System.out.println(k + " " + v));
        
        booleanMap.replaceAll((k, v) -> Boolean.FALSE);
        
        System.out.println("Hashmap replaceAll, here are the values");
        
        long startTime = System.currentTimeMillis();
        
        // Print out the modified values
        booleanMap.forEach((k, v) -> System.out.println(k + " " + v));
        
        long stopTime = System.currentTimeMillis();
        
        System.out.println("Replace took time " + (stopTime-startTime));
    }
}

Good demo of how simple lamdas in Java collections can be