Java - Join and Split Arrays and Collections
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govinda-radhe
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5a172a792a
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package org.baeldung.java.collections;
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import java.util.ArrayList;
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import org.junit.Assert;
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import org.junit.Test;
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//import java.util.AbstractSet;
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public class CollectionsJoinAndSplitJUnitTest {
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public ArrayList<String> sauces = new ArrayList<String>();
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public ArrayList<String> cheeses = new ArrayList<String>();
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public ArrayList<String> vegetables = new ArrayList<String>();
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public ArrayList<ArrayList<String>> ingredients = new ArrayList<ArrayList<String>>();
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public CollectionsJoinAndSplitJUnitTest() throws Exception {
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//generate test data
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whenGeneratingTestData_ShouldSucceed();
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}
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@Test
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public void whenGeneratingTestData_ShouldSucceed() throws Exception {
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sauces.clear();
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sauces.add("Olive Oil");
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sauces.add("Marinara");
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cheeses.clear();
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cheeses.add("Mozarella");
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cheeses.add("Feta");
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cheeses.add("Parmesan");
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vegetables.clear();
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vegetables.add("Olives");
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vegetables.add("Spinach");
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vegetables.add("Green Peppers");
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ingredients.clear();
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ingredients.add(sauces);
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ingredients.add(cheeses);
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ingredients.add(vegetables);
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Assert.assertTrue(sauces.size() == 2);
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Assert.assertTrue(cheeses.size() == 3);
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Assert.assertTrue(vegetables.size() == 3);
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Assert.assertTrue(ingredients.size() == 3);
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}
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@Test
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public void givenThreeArrayLists_whenJoiningIntoOneArrayList_ShouldSucceed() throws Exception {
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ArrayList<ArrayList<String>> toppings = new ArrayList<ArrayList<String>>();
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toppings.add(sauces);
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toppings.add(cheeses);
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toppings.add(vegetables);
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Assert.assertTrue(toppings.size() == 3);
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Assert.assertTrue(toppings.contains(sauces));
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Assert.assertTrue(toppings.contains(cheeses));
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Assert.assertTrue(toppings.contains(vegetables));
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}
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@Test
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public void givenOneArrayList_whenSplittingIntoTwoArrayLists_shouldSucceed() throws Exception {
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ArrayList<ArrayList<String>> toppings = ingredients;
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ArrayList<ArrayList<String>> removedToppings = new ArrayList<ArrayList<String>>();
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removedToppings.add(toppings.remove(toppings.indexOf(vegetables)));
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Assert.assertTrue(removedToppings.contains(vegetables));
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Assert.assertTrue(removedToppings.size() == 1);
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Assert.assertTrue(toppings.size() == 2);
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Assert.assertTrue(toppings.contains(sauces));
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Assert.assertTrue(toppings.contains(cheeses));
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}
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}
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package org.baeldung.java.arrays;
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import java.util.Arrays;
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import org.junit.Assert;
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import org.junit.Test;
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public class ArraysJoinAndSplitJUnitTest {
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//pizza toppings
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private final String[] sauces = {"Marinara", "Olive Oil"};
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private final String[] cheeses = {"Mozzarella", "Feta", "Parmesan"};
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private final String[] vegetables = {"Olives", "Spinach", "Green Peppers"};
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@Test
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public void givenThreeStringArrays_whenJoiningIntoOneStringArray_ShouldSucceed() throws Exception {
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//create the destination array
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String[] toppings = new String[sauces.length + cheeses.length + vegetables.length];
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//add the sauces
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System.arraycopy(sauces, 0, toppings, 0, sauces.length);
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int AddedSoFarCount = sauces.length;
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//add the cheeses
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System.arraycopy(cheeses, 0, toppings, AddedSoFarCount, cheeses.length);
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AddedSoFarCount += cheeses.length;
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//add the vegetables
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System.arraycopy(vegetables, 0, toppings, AddedSoFarCount, vegetables.length);
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//check the result
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Assert.assertArrayEquals(toppings,
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new String[] {"Marinara", "Olive Oil", "Mozzarella", "Feta",
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"Parmesan", "Olives", "Spinach", "Green Peppers"} );
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}
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private final String[] customers = {"Jay", "Harry", "Ronnie", "Gary", "Ross"};
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@Test
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public void givenOneStringArray_whenSplittingInHalfBetweenTwoStringArrays_ShouldSucceed() throws Exception {
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//split the orders in half, rounding up
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int ordersHalved = (customers.length / 2) + (customers.length % 2);
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//divide the orders between two drivers
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String[] driverOne = Arrays.copyOf(customers, ordersHalved);
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String[] driverTwo = Arrays.copyOfRange(customers, ordersHalved, customers.length);
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//check ther result
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Assert.assertArrayEquals(driverOne, new String[] {"Jay", "Harry", "Ronnie"} );
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Assert.assertArrayEquals(driverTwo, new String[] {"Gary", "Ross"} );
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}
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}
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package org.baeldung.java.collections;
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import java.util.ArrayList;
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import org.junit.Assert;
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import org.junit.Test;
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//import java.util.AbstractSet;
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public class CollectionsJoinAndSplitJUnitTest {
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public ArrayList<String> sauces = new ArrayList<String>();
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public ArrayList<String> cheeses = new ArrayList<String>();
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public ArrayList<String> vegetables = new ArrayList<String>();
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public ArrayList<ArrayList<String>> ingredients = new ArrayList<ArrayList<String>>();
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public CollectionsJoinAndSplitJUnitTest() throws Exception {
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//generate test data
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whenGeneratingTestData_ShouldSucceed();
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}
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@Test
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public void whenGeneratingTestData_ShouldSucceed() throws Exception {
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sauces.clear();
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sauces.add("Olive Oil");
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sauces.add("Marinara");
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cheeses.clear();
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cheeses.add("Mozarella");
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cheeses.add("Feta");
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cheeses.add("Parmesan");
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vegetables.clear();
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vegetables.add("Olives");
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vegetables.add("Spinach");
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vegetables.add("Green Peppers");
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ingredients.clear();
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ingredients.add(sauces);
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ingredients.add(cheeses);
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ingredients.add(vegetables);
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Assert.assertTrue(sauces.size() == 2);
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Assert.assertTrue(cheeses.size() == 3);
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Assert.assertTrue(vegetables.size() == 3);
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Assert.assertTrue(ingredients.size() == 3);
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}
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@Test
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public void givenThreeArrayLists_whenJoiningIntoOneArrayList_ShouldSucceed() throws Exception {
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ArrayList<ArrayList<String>> toppings = new ArrayList<ArrayList<String>>();
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toppings.add(sauces);
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toppings.add(cheeses);
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toppings.add(vegetables);
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Assert.assertTrue(toppings.size() == 3);
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Assert.assertTrue(toppings.contains(sauces));
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Assert.assertTrue(toppings.contains(cheeses));
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Assert.assertTrue(toppings.contains(vegetables));
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}
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@Test
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public void givenOneArrayList_whenSplittingIntoTwoArrayLists_shouldSucceed() throws Exception {
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ArrayList<ArrayList<String>> toppings = ingredients;
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ArrayList<ArrayList<String>> removedToppings = new ArrayList<ArrayList<String>>();
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removedToppings.add(toppings.remove(toppings.indexOf(vegetables)));
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Assert.assertTrue(removedToppings.contains(vegetables));
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Assert.assertTrue(removedToppings.size() == 1);
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Assert.assertTrue(toppings.size() == 2);
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Assert.assertTrue(toppings.contains(sauces));
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Assert.assertTrue(toppings.contains(cheeses));
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}
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}
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