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Implement Combiner methods

vvmk 6 år sedan
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d67c8576f9

+ 1
- 0
src/main/java/ArrayListCombiner/ArrayListCombiner.java Visa fil

@@ -10,6 +10,7 @@ import java.util.ArrayList;
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  */
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 public class ArrayListCombiner {
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     public static <E> void superCombiner(ArrayList<? super E> parent, ArrayList<E> child) {
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+        
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     }
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     public static <E> void extendCombiner(ArrayList<E> parent, ArrayList<? extends E> child) {

+ 9
- 7
src/main/java/Pair/Arrays.java Visa fil

@@ -1,6 +1,8 @@
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 package Pair;
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 import java.util.ArrayList;
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+import java.util.Collections;
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+import java.util.Comparator;
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 /**
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  * In here you must make firstLast, which will return a pair of the first element in the array list and the last
@@ -10,22 +12,22 @@ import java.util.ArrayList;
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  * And a minmax method that returns a pair containing the largest and smallest items from the array list
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  */
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 public class Arrays {
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-    public static <E> Pair<E> firstLast(ArrayList<E> a) {
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+    public static <E extends Comparable<E>> Pair<E> firstLast(ArrayList<E> a) {
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         E first = a.get(0);
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         E second = a.get(a.size() - 1);
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         return new Pair<>(first, second);
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     }
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-    public <E> E max(ArrayList<E> a) {
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-        return null;
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+    public <E extends Comparable<E>> E max(ArrayList<E> a) {
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+        return Collections.max(a);
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     }
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-    public <E> E min(ArrayList<E> a) {
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-        return null;
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+    public <E extends Comparable<E>> E min(ArrayList<E> a) {
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+        return Collections.min(a);
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     }
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-    public <E> Pair<E> minmax(ArrayList<E> a) {
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-        return null;
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+    public <E extends Comparable<E>> Pair<E> minmax(ArrayList<E> a) {
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+        return new Pair<>(min(a), max(a));
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     }
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 }