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[BAEL - 3126] create triangles with for loops - examples #7573

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Merged
KevinGilmore merged 1 commit into from
Aug 19, 2019
Merged

[BAEL - 3126] create triangles with for loops - examples #7573

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16 changes: 14 additions & 2 deletions ...laneous-3/src/main/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamples.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@

public class PrintTriangleExamples {

public static String printARightAngledTriangle(int N) {
public static String printARightTriangle(int N) {
StringBuilder result = new StringBuilder();
for (int r = 1; r <= N; r++) {
for (int j = 1; j <= r; j++) {
Expand All @@ -29,6 +29,17 @@ public static String printAnIsoscelesTriangle(int N) {
return result.toString();
}

public static String printAnIsoscelesTriangleUsingStringUtils(int N) {
StringBuilder result = new StringBuilder();

for (int r = 1; r <= N; r++) {
result.append(StringUtils.repeat(' ', N - r));
result.append(StringUtils.repeat('*', 2 * r - 1));
result.append(System.lineSeparator());
}
return result.toString();
}

public static String printAnIsoscelesTriangleUsingSubstring(int N) {
StringBuilder result = new StringBuilder();
String helperString = StringUtils.repeat(' ', N - 1) + StringUtils.repeat('*', N * 2 - 1);
Expand All @@ -41,8 +52,9 @@ public static String printAnIsoscelesTriangleUsingSubstring(int N) {
}

public static void main(String[] args) {
System.out.println(printARightAngledTriangle(5));
System.out.println(printARightTriangle(5));
System.out.println(printAnIsoscelesTriangle(5));
System.out.println(printAnIsoscelesTriangleUsingStringUtils(5));
System.out.println(printAnIsoscelesTriangleUsingSubstring(5));
}

Expand Down
20 changes: 14 additions & 6 deletions ...3/src/test/java/com/baeldung/algorithms/printtriangles/PrintTriangleExamplesUnitTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,9 +9,9 @@

@RunWith(JUnitParamsRunner.class)
public class PrintTriangleExamplesUnitTest {
private static Object[][] rightAngledTriangles() {
String expected0 = "";

private static Object[][] rightTriangles() {
String expected0 = "";

String expected2 = "*" + System.lineSeparator()
+ "**" + System.lineSeparator();
Expand Down Expand Up @@ -39,9 +39,9 @@ private static Object[][] rightAngledTriangles() {
}

@Test
@Parameters(method = "rightAngledTriangles")
public void whenPrintARightAngledTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printARightAngledTriangle(nrOfRows);
@Parameters(method = "rightTriangles")
public void whenPrintARightTriangleIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printARightTriangle(nrOfRows);

assertEquals(expected, actual);
}
Expand Down Expand Up @@ -81,6 +81,14 @@ public void whenPrintAnIsoscelesTriangleIsCalled_ThenTheCorrectStringIsReturned(

assertEquals(expected, actual);
}

@Test
@Parameters(method = "isoscelesTriangles")
public void whenPrintAnIsoscelesTriangleUsingStringUtilsIsCalled_ThenTheCorrectStringIsReturned(int nrOfRows, String expected) {
String actual = PrintTriangleExamples.printAnIsoscelesTriangleUsingStringUtils(nrOfRows);

assertEquals(expected, actual);
}

@Test
@Parameters(method = "isoscelesTriangles")
Expand Down