BAEL-838 Re-adding last changes with regexp and new line strings. (#1825)

* Code for Dependency Injection Article.

* Added Java based configuration. Downloaded formatter.xml and reformatted
all changed files. Manually changed tab into 4 spaces in XML
configuration files.

* BAEL-434 - Spring Roo project files generated by Spring Roo. No
formatting applied. Added POM, java and resources folders.

* Moved project from roo to spring-roo folder.

* BAEL-838 Initial code showing how to remove last char - helper class and tests.

* BAEL-838 Corrected Helper class and associated empty string test case. Added StringUtils.substing tests.

* BAEL-838 Refromatted code using formatter.xml. Added Assert.assertEquals import. Renamed test to follow convention. Reordered tests.

* BAEL-838 - Added regex method and updated tests.

* BAEL-838 Added new line examples.

core-java/src/main/java/com/baeldung/string/RemoveLastChar.java

@@ -8,4 +8,12 @@ public class RemoveLastChar {
             return (s.substring(0, s.length() - 1));
         }
     }
+
+    public static String chop(String s) {
+        if (s == null) {
+            return s;
+        } else {
+            return s.replaceAll(".$", "");
+        }
+    }
 }

core-java/src/test/java/com/baeldung/string/RemoveLastCharTest.java

@@ -1,7 +1,7 @@
 package com.baeldung.string;
 
 import static org.junit.Assert.assertEquals;
-
+import static org.junit.Assert.assertNotEquals;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 
@@ -12,18 +12,23 @@ public class RemoveLastCharTest {
     public static final String EMPTY_STRING = "";
     public static final String ONE_CHAR_STRING = "a";
     public static final String WHITE_SPACE_AT_THE_END_STRING = "abc ";
+    public static final String NEW_LINE_AT_THE_END_STRING = "abc\n";
+    public static final String MULTIPLE_LINES_STRING = "abc\ndef";
 
     @Test
     public void givenTestString_whenSubstring_thenGetStingWithoutLastChar() {
         assertEquals("abcde", RemoveLastChar.substring(TEST_STRING));
         assertEquals("abcde", StringUtils.substring(TEST_STRING, 0, TEST_STRING.length() - 1));
         assertEquals("abcde", StringUtils.chop(TEST_STRING));
+        assertEquals("abcde", TEST_STRING.replaceAll(".$", ""));
+        assertEquals("abcde", RemoveLastChar.chop(TEST_STRING));
     }
 
     @Test
     public void givenNullString_whenSubstring_thenGetNullString() {
         assertEquals(NULL_STRING, RemoveLastChar.substring(NULL_STRING));
         assertEquals(NULL_STRING, StringUtils.chop(NULL_STRING));
+        assertEquals(NULL_STRING, RemoveLastChar.chop(NULL_STRING));
     }
 
     @Test
@@ -31,6 +36,8 @@ public class RemoveLastCharTest {
         assertEquals(EMPTY_STRING, RemoveLastChar.substring(EMPTY_STRING));
         assertEquals(EMPTY_STRING, StringUtils.substring(EMPTY_STRING, 0, EMPTY_STRING.length() - 1));
         assertEquals(EMPTY_STRING, StringUtils.chop(EMPTY_STRING));
+        assertEquals(EMPTY_STRING, EMPTY_STRING.replaceAll(".$", ""));
+        assertEquals(EMPTY_STRING, RemoveLastChar.chop(EMPTY_STRING));
     }
 
     @Test
@@ -38,6 +45,8 @@ public class RemoveLastCharTest {
         assertEquals(EMPTY_STRING, RemoveLastChar.substring(ONE_CHAR_STRING));
         assertEquals(EMPTY_STRING, StringUtils.substring(ONE_CHAR_STRING, 0, ONE_CHAR_STRING.length() - 1));
         assertEquals(EMPTY_STRING, StringUtils.chop(ONE_CHAR_STRING));
+        assertEquals(EMPTY_STRING, ONE_CHAR_STRING.replaceAll(".$", ""));
+        assertEquals(EMPTY_STRING, RemoveLastChar.chop(ONE_CHAR_STRING));
     }
 
     @Test
@@ -45,5 +54,25 @@ public class RemoveLastCharTest {
         assertEquals("abc", RemoveLastChar.substring(WHITE_SPACE_AT_THE_END_STRING));
         assertEquals("abc", StringUtils.substring(WHITE_SPACE_AT_THE_END_STRING, 0, WHITE_SPACE_AT_THE_END_STRING.length() - 1));
         assertEquals("abc", StringUtils.chop(WHITE_SPACE_AT_THE_END_STRING));
+        assertEquals("abc", WHITE_SPACE_AT_THE_END_STRING.replaceAll(".$", ""));
+        assertEquals("abc", RemoveLastChar.chop(WHITE_SPACE_AT_THE_END_STRING));
+    }
+    
+    @Test
+    public void givenStringWithNewLineAtTheEnd_whenSubstring_thenGetStringWithoutNewLine() {
+        assertEquals("abc", RemoveLastChar.substring(NEW_LINE_AT_THE_END_STRING));
+        assertEquals("abc", StringUtils.substring(NEW_LINE_AT_THE_END_STRING, 0, NEW_LINE_AT_THE_END_STRING.length() - 1));
+        assertEquals("abc", StringUtils.chop(NEW_LINE_AT_THE_END_STRING));
+        assertNotEquals("abc", NEW_LINE_AT_THE_END_STRING.replaceAll(".$", ""));
+        assertNotEquals("abc", RemoveLastChar.chop(NEW_LINE_AT_THE_END_STRING));
+    }
+    
+    @Test
+    public void givenMultiLineString_whenSubstring_thenGetStringWithoutNewLine() {
+        assertEquals("abc\nde", RemoveLastChar.substring(MULTIPLE_LINES_STRING));
+        assertEquals("abc\nde", StringUtils.substring(MULTIPLE_LINES_STRING, 0, MULTIPLE_LINES_STRING.length() - 1));
+        assertEquals("abc\nde", StringUtils.chop(MULTIPLE_LINES_STRING));
+        assertEquals("abc\nde", MULTIPLE_LINES_STRING.replaceAll(".$", ""));
+        assertEquals("abc\nde", RemoveLastChar.chop(MULTIPLE_LINES_STRING));
     }
 }