Move articles out of java-strings part4

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/EmptyStringCheck.java

@@ -0,0 +1,8 @@
+package com.baeldung.emptystrings;
+
+class EmptyStringCheck {
+
+    boolean isEmptyString(String string) {
+        return string == null || string.isEmpty();
+    }
+}

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/Java5EmptyStringCheck.java

@@ -0,0 +1,8 @@
+package com.baeldung.emptystrings;
+
+class Java5EmptyStringCheck {
+
+    boolean isEmptyString(String string) {
+        return string == null || string.length() == 0;
+    }
+}

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/PlainJavaBlankStringCheck.java

@@ -0,0 +1,8 @@
+package com.baeldung.emptystrings;
+
+class PlainJavaBlankStringCheck {
+
+    boolean isBlankString(String string) {
+        return string == null || string.trim().isEmpty();
+    }
+}

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/SomeClassWithValidations.java

@@ -0,0 +1,14 @@
+package com.baeldung.emptystrings;
+
+import javax.validation.constraints.Pattern;
+
+class SomeClassWithValidations {
+
+    @Pattern(regexp = "\\A(?!\\s*\\Z).+")
+    private String someString;
+
+    SomeClassWithValidations setSomeString(String someString) {
+        this.someString = someString;
+        return this;
+    }
+}