Kaitrina High 6 лет назад
Родитель
Сommit
68f57ff0e4
2 измененных файлов: 110 добавлений и 78 удалений
  1. 36
    4
      src/main/java/Pair/Arrays.java
  2. 74
    74
      src/test/java/Pair/ArraysTest.java

+ 36
- 4
src/main/java/Pair/Arrays.java Просмотреть файл

@@ -10,7 +10,39 @@ import java.util.Collections;
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  * A max method that returns the largest item in the 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 <___> Pair<E> firstLast(ArrayList<___> a) {
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-//    }
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-//}
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+@SuppressWarnings("unchecked")
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+public class Arrays {
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+
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+
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+    public Arrays() {
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+    }
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+
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+
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+    public static <E extends Comparable> Pair<E> firstLast(ArrayList<E> a) {
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+        return new Pair<E>(a.get(0), a.get(a.size() - 1));
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+    }
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+
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+
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+    public static <E extends Comparable> Comparable max(ArrayList<E> a ){
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+        return Collections.max(a);
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+
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+    }
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+
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+    public static <E extends Comparable> Comparable min(ArrayList<E> a) {
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+        return Collections.min(a);
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+    }
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+
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+    public static <E extends Comparable> Pair minMax(ArrayList<E> a) {
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+               return new Pair(Collections.min(a), Collections.max(a));
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+                 }
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+}
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+
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+
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+
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+//        Create a utility class called Arrays and, in that, create a method
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+//        public static <___> Pair<E> firstLast(ArrayList<___> a)
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+//        That returns a Pair containing the first and last element of the array.
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+//        NOTE: The <___> is there because you need to fill in the blank.
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+//        In Arrays make two methods, min and max that returns the smallest and largest elements in the ArrayList.
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+//        In Arrays make a minMax function that returns a Pair with the minimum and maximum values of the ArrayList.
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+

+ 74
- 74
src/test/java/Pair/ArraysTest.java Просмотреть файл

@@ -1,74 +1,74 @@
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-//package Pair;
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-//
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-//import org.junit.Assert;
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-//import org.junit.Test;
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-//
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-//import java.util.ArrayList;
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-//
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-//public class ArraysTest {
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-//    @Test
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-//    public void firstLast() throws Exception {
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-//        // Given an ArrayList of Integers
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-//        ArrayList<Integer> al = new ArrayList<>();
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-//        al.add(1);
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-//        al.add(5);
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-//        al.add(3);
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-//        al.add(4);
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-//        al.add(2);
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-//        al.add(0);
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-//        al.add(1000);
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-//        // When firstLast is called
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-//        Pair<Integer> result = Arrays.firstLast(al);
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-//        // Then it should return the first and last items
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-//        Assert.assertEquals(new Integer(1), result.getFirst());
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-//        Assert.assertEquals(new Integer(1000), result.getSecond());
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-//    }
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-//
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-//    @Test
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-//    public void testMin() throws Exception {
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-//        // Given an ArrayList of Integers
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-//        ArrayList<Integer> al = new ArrayList<>();
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-//        al.add(1);
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-//        al.add(5);
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-//        al.add(3);
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-//        al.add(4);
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-//        al.add(2);
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-//        al.add(0);
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-//        al.add(1000);
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-//        // When min is called assert that it gets the smallest item
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-//        Assert.assertEquals(new Integer(0), Arrays.min(al));
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-//    }
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-//
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-//    @Test
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-//    public void testMax() throws Exception {
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-//        // Given an ArrayList of Integers
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-//        ArrayList<Integer> al = new ArrayList<>();
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-//        al.add(1);
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-//        al.add(5);
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-//        al.add(3);
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-//        al.add(4);
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-//        al.add(2);
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-//        al.add(0);
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-//        al.add(1000);
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-//        // When min is called assert that it gets the largest item
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-//        Assert.assertEquals(new Integer(1000), Arrays.max(al));
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-//    }
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-//
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-//    @Test
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-//    public void testMinMax() throws Exception {
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-//        // Given an ArrayList of Integers
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-//        ArrayList<Integer> al = new ArrayList<>();
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-//        al.add(1);
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-//        al.add(5);
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-//        al.add(3);
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-//        al.add(4);
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-//        al.add(2);
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-//        al.add(0);
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-//        al.add(1000);
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-//        // When minMax is called
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-//        Pair<Integer> result = Arrays.minMax(al);
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-//        // Then it should return the first and last items
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-//        Assert.assertEquals(new Integer(0), result.min());
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-//        Assert.assertEquals(new Integer(1000), result.max());
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-//    }
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-//}
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+package Pair;
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+
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+import org.junit.Assert;
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+import org.junit.Test;
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+
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+import java.util.ArrayList;
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+
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+public class ArraysTest {
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+    @Test
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+    public void firstLast() throws Exception {
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+        // Given an ArrayList of Integers
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+        ArrayList<Integer> al = new ArrayList<>();
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+        al.add(1);
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+        al.add(5);
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+        al.add(3);
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+        al.add(4);
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+        al.add(2);
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+        al.add(0);
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+        al.add(1000);
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+        // When firstLast is called
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+        Pair<Integer> result = Arrays.firstLast(al);
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+        // Then it should return the first and last items
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+        Assert.assertEquals(new Integer(1), result.getFirst());
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+        Assert.assertEquals(new Integer(1000), result.getSecond());
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+    }
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+
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+    @Test
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+    public void testMin() throws Exception {
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+        // Given an ArrayList of Integers
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+        ArrayList<Integer> al = new ArrayList<>();
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+        al.add(1);
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+        al.add(5);
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+        al.add(3);
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+        al.add(4);
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+        al.add(2);
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+        al.add(0);
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+        al.add(1000);
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+        // When min is called assert that it gets the smallest item
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+        Assert.assertEquals(new Integer(0), Arrays.min(al));
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+    }
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+
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+    @Test
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+    public void testMax() throws Exception {
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+        // Given an ArrayList of Integers
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+        ArrayList<Integer> al = new ArrayList<>();
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+        al.add(1);
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+        al.add(5);
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+        al.add(3);
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+        al.add(4);
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+        al.add(2);
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+        al.add(0);
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+        al.add(1000);
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+        // When min is called assert that it gets the largest item
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+        Assert.assertEquals(new Integer(1000), Arrays.max(al));
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+    }
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+
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+    @Test
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+    public void testMinMax() throws Exception {
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+        // Given an ArrayList of Integers
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+        ArrayList<Integer> al = new ArrayList<>();
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+        al.add(1);
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+        al.add(5);
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+        al.add(3);
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+        al.add(4);
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+        al.add(2);
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+        al.add(0);
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+        al.add(1000);
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+        // When minMax is called
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+        Pair<Integer> result = Arrays.minMax(al);
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+        // Then it should return the first and last items
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+        Assert.assertEquals(new Integer(0), result.min());
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+        Assert.assertEquals(new Integer(1000), result.max());
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+    }
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+}