Merge pull request eugenp#5934 from rockoder/java11-string

Java 11 String APIs

Author: eric-martin

core-java-11/src/test/java/com/baeldung/NewStringAPIUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung;
+
+import static org.hamcrest.CoreMatchers.is;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class NewStringAPIUnitTest {
+
+    @Test
+    public void whenRepeatStringTwice_thenGetStringTwice() {
+        String output = "La ".repeat(2) + "Land";
+
+        is(output).equals("La La Land");
+    }
+
+    @Test
+    public void whenStripString_thenReturnStringWithoutWhitespaces() {
+        is("\n\t  hello   \u2005".strip()).equals("hello");
+    }
+
+    @Test
+    public void whenTrimAdvanceString_thenReturnStringWithWhitespaces() {
+        is("\n\t  hello   \u2005".trim()).equals("hello   \u2005");
+    }
+
+    @Test
+    public void whenBlankString_thenReturnTrue() {
+        assertTrue("\n\t\u2005  ".isBlank());
+    }
+
+    @Test
+    public void whenMultilineString_thenReturnNonEmptyLineCount() {
+        String multilineStr = "This is\n \n a multiline\n string.";
+
+        long lineCount = multilineStr.lines()
+          .filter(String::isBlank)
+          .count();
+
+        is(lineCount).equals(3L);
+    }
+}