Swap Case

Author: ardallie

src/easy/SwapCase.java

@@ -0,0 +1,42 @@
+package easy;
+
+/**
+ * Have the function SwapCase(str) take the str parameter
+ * and swap the case of each character.
+ * For example: if str is "Hello World" the output should be hELLO wORLD.
+ * Let numbers and symbols stay the way they are.
+ */
+public class SwapCase {
+
+ /**
+ * Swap Case function.
+ *
+ * @param str input string
+ * @return the output string
+ */
+ private static String swapCase(String str) {
+ StringBuilder out = new StringBuilder();
+ char[] chars = str.toCharArray();
+ for (char c : chars) {
+ if (Character.isLowerCase(c)) {
+ out.append(Character.toUpperCase(c));
+ } else {
+ out.append(Character.toLowerCase(c));
+ }
+ }
+ return out.toString();
+ }
+
+ /**
+ * Entry point.
+ *
+ * @param args command line arguments
+ */
+ public static void main(String[] args) {
+ var result1 = swapCase("The Livin' Free EP");
+ System.out.println(result1);
+ var result2 = swapCase("Selected MP3");
+ System.out.println(result2);
+ }
+
+}