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OnJava8-Examples/onjava/FillMap.java at master · BruceEckel/OnJava8-Examples · GitHub

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// onjava/FillMap.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

package onjava;

import java.util.*;

import java.util.function.*;

import java.util.stream.*;

public class FillMap {

public static <K, V> Map<K,V>

basic(Supplier<Pair<K,V>> pairGen, int size) {

return Stream.generate(pairGen)

.limit(size)

.collect(Collectors

.toMap(Pair::key, Pair::value));

}

public static <K, V> Map<K,V>

basic(Supplier<K> keyGen,

Supplier<V> valueGen, int size) {

return Stream.generate(

() -> Pair.make(keyGen.get(), valueGen.get()))

.limit(size)

.collect(Collectors

.toMap(Pair::key, Pair::value));

}

public static <K, V, M extends Map<K,V>>

M create(Supplier<K> keyGen,

Supplier<V> valueGen,

Supplier<M> mapSupplier, int size) {

return Stream.generate( () ->

Pair.make(keyGen.get(), valueGen.get()))

.limit(size)

.collect(Collectors

.toMap(Pair::key, Pair::value,

(k, v) -> k, mapSupplier));

}

}

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