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Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_25.java

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+package ch_10;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * **10.25 (New string split method) The split method in the String class returns an
+ * array of strings consisting of the substrings split by the delimiters. However, the
+ * delimiters are not returned. Implement the following new method that returns
+ * an array of strings consisting of the substrings split by the matching delimiters,
+ * including the matching delimiters.
+ * <p>
+ * public static String[] split(String s, String regex)
+ * For example, split("ab#12#453", "#") returns ab, #, 12, #, 453 in an
+ * array of String, and split("a?b?gf#e", "[?#]") returns a, b, ?, b, gf,
+ * #, and e in an array of String.
+ */
+public class Exercise10_25 {
+
+    public static void main(String[] args) {
+        /* Tests */
+        String s = "ab#12#453";
+        String regex = "#";
+        String s2 = "a?b?gf#e";
+        String regex2 = "[?#]";
+
+        System.out.println("split(\"ab#12#453\",\"#\"): " + Arrays.toString(split(s, regex)));
+        System.out.println("split(\"a?b?gf#e\",\"[?#]\"): " + Arrays.toString(split(s2, regex2)));
+    }
+
+    public static String[] split(String s, String regex) {
+        ArrayList<String> splitList = new ArrayList<>();
+        if (regex == null || regex.length() < 1) {
+            return new String[]{"regex must not be null and length must be greater than 0"};
+        }
+
+        ArrayList<Character> splitters = new ArrayList<>();
+        for (char ch : regex.toCharArray()) {
+            if (ch == '[' || ch == ']') continue;
+            splitters.add(ch);
+        }
+        String subString = "";
+        for (int i = 0; i < s.length(); i++) {
+            if (splitters.contains(s.charAt(i))) {
+                if (subString.length() > 0) {
+                    splitList.add(subString);
+                    subString = "";
+                }
+
+                splitList.add(s.charAt(i) + "");
+                i++;
+                while (i < s.length()) {
+                    if (!splitters.contains(s.charAt(i))) {
+                        subString = subString.concat(s.charAt(i) + "");
+                    } else {
+                        splitList.add(subString);
+                        subString = "";
+                        splitList.add(s.charAt(i) + "");
+                        break;
+                    }
+                    i++;
+                }
+            } else {
+                subString = subString.concat(s.charAt(i) + "");
+            }
+        }
+        if (subString.length() > 0) {
+            splitList.add(subString);
+        }
+        return splitList.toArray(new String[]{});
+
+    }
+}