Merge pull request #18779 from umara-123/master

ARTICLE-BAEL-9413 Read String Builder Line by Line in Java

Author: xaeldung

core-java-modules/core-java-25/stringbuilder/pom.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example</groupId>
+    <artifactId>stringbuilder</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
+
+</project>

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/BufferedReaderApproach.java

@@ -0,0 +1,28 @@
+package com.example;
+
+import java.io.BufferedReader;
+import java.io.StringReader;
+import java.io.IOException;
+
+public class BufferedReaderApproach {
+
+    public static void main(String[] args) {
+
+        StringBuilder sb = new StringBuilder(
+            "StringBuilder\nBufferedReader Approach\r\nLine by Line Reading\rAnother line"
+        );
+
+        try (BufferedReader reader = new BufferedReader(new StringReader(sb.toString()))) {
+
+            String line;
+            while ((line = reader.readLine()) != null) {
+                System.out.println(line);
+            }
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+}

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/LineSeparatorApproach.java

@@ -0,0 +1,16 @@
+package com.example;
+
+public class LineSeparatorApproach {
+    public static void main(String[] args) {
+        StringBuilder sb = new StringBuilder(
+            "StringBuilder\nLine Separator Approach\r\nLine by Line Reading\rAnother line"
+        );
+
+        // \R matches any line break (\n, \r\n, \r)
+        String[] lines = sb.toString().split("\\R");
+
+        for (String line : lines) {
+            System.out.println(line);
+        }
+    }
+}

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/Main.java

@@ -0,0 +1,9 @@
+package com.example;
+
+public class Main {
+    public static void main(String[] args) {
+
+      
+
+    }
+}

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/ManualIterationApproach.java

@@ -0,0 +1,33 @@
+package com.example;
+
+public class ManualIterationApproach {
+
+    public static void main(String[] args) {
+
+        StringBuilder sb = new StringBuilder(
+            "StringBuilder\nManual Iteration Approach\r\nLine by Line Reading\rAnother line"
+        );
+
+        int start = 0;
+
+        for (int i = 0; i < sb.length(); i++) {
+
+            char c = sb.charAt(i);
+
+            if (c == '\n' || c == '\r') {
+
+                System.out.println(sb.substring(start, i));
+
+                if (c == '\r' && i + 1 < sb.length() && sb.charAt(i + 1) == '\n') {
+                    i++;
+                }
+
+                start = i + 1;
+            }
+        }
+
+        if (start < sb.length()) {
+            System.out.println(sb.substring(start));
+        }
+    }
+}

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/ScannerApproach.java

@@ -0,0 +1,23 @@
+package com.example;
+
+import java.util.Scanner;
+import java.io.StringReader;
+
+public class ScannerApproach {
+
+    public static void main(String[] args) {
+
+        StringBuilder sb = new StringBuilder(
+            "StringBuilder\nScanner Approach\r\nLine by Line Reading\rAnother line"
+        );
+
+        Scanner scanner = new Scanner(new StringReader(sb.toString()));
+
+        while (scanner.hasNextLine()) {
+            System.out.println(scanner.nextLine());
+        }
+
+        scanner.close();
+    }
+
+}

core-java-modules/core-java-25/stringbuilder/src/main/java/com/example/StreamLinesApproach.java

@@ -0,0 +1,16 @@
+package com.example;
+
+public class StreamLinesApproach {
+
+    public static void main(String[] args) {
+
+        StringBuilder sb = new StringBuilder(
+            "StringBuilder\nStream Approach\r\nLine by Line Reading\rAnother line"
+        );
+
+        sb.toString()
+          .lines()
+          .forEach(System.out::println);
+
+    }
+}