BAEL-1761 Jagged Arrays In Java

2018-06-03 17:22:10 +05:30
parent 5836bfa794
commit 642bff3077
2 changed files with 102 additions and 0 deletions
@@ -0,0 +1,53 @@
+package com.baeldung.array;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.PrintStream;
+
+import org.junit.Test;
+
+public class JaggedArrayTest {
+
+    private JaggedArray obj = new JaggedArray();
+
+    @Test
+    public void whenInitializedUsingShortHandForm_thenCorrect() {
+        assertArrayEquals(new int[][] { { 1, 2 }, { 3, 4, 5 }, { 6, 7, 8, 9 } }, obj.shortHandFormInitialization());
+    }
+
+    @Test
+    public void whenInitializedWithDeclarationAndThenInitalization_thenCorrect() {
+        assertArrayEquals(new int[][] { { 1, 2 }, { 3, 4, 5 }, { 6, 7, 8, 9 } }, obj.declarationAndThenInitialization());
+    }
+
+    @Test
+    public void whenInitializedWithDeclarationAndThenInitalizationUsingUserInputs_thenCorrect() {
+        InputStream is = new ByteArrayInputStream("1 2 3 4 5 6 7 8 9".getBytes());
+        System.setIn(is);
+        assertArrayEquals(new int[][] { { 1, 2 }, { 3, 4, 5 }, { 6, 7, 8, 9 } }, obj.declarationAndThenInitializationUsingUserInputs());
+        System.setIn(System.in);
+    }
+
+    @Test
+    public void givenJaggedArrayAndAnIndex_thenReturnArrayAtGivenIndex() {
+        int[][] jaggedArr = { { 1, 2 }, { 3, 4, 5 }, { 6, 7, 8, 9 } };
+        assertArrayEquals(new int[] { 1, 2 }, obj.getElementAtGivenIndex(jaggedArr, 0));
+        assertArrayEquals(new int[] { 3, 4, 5 }, obj.getElementAtGivenIndex(jaggedArr, 1));
+        assertArrayEquals(new int[] { 6, 7, 8, 9 }, obj.getElementAtGivenIndex(jaggedArr, 2));
+    }
+
+    @Test
+    public void givenJaggedArray_whenUsingArraysAPI_thenVerifyPrintedElements() {
+        int[][] jaggedArr = { { 1, 2 }, { 3, 4, 5 }, { 6, 7, 8, 9 } };
+        ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(outContent));
+        obj.printElements(jaggedArr);
+        assertEquals("[1, 2]\n[3, 4, 5]\n[6, 7, 8, 9]\n", outContent.toString());
+        System.setOut(System.out);
+    }
+
+}