Merge pull request #18847 from degr8sid-code/master

BAEL-6604: Terminating Scanner when Input is Complete in Java

Author: xaeldung

core-java-modules/core-java-26/src/main/java/baeldung/scannerinput/DoWhileScanner.java

@@ -0,0 +1,17 @@
+package com.baeldung.scannerinput;
+
+import java.util.Scanner;
+
+public class DoWhileScanner {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        String input;
+
+        do {
+            input = sc.nextLine();
+            System.out.println(input);
+        } while (!input.equals("exit"));
+
+        sc.close();
+    }
+}

core-java-modules/core-java-26/src/main/java/baeldung/scannerinput/EOFExample.java

@@ -0,0 +1,23 @@
+package com.baeldung.scannerinput;
+
+import java.util.Scanner;
+
+public class EOFExample {
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+
+        try {
+            System.out.println("Enter text (press CTRL+D on Unix/Mac or CTRL+Z on Windows to end):");
+
+            while (scan.hasNextLine()) {
+                String line = scan.nextLine();
+                System.out.println("You entered: " + line);
+            }
+
+            System.out.println("End of input detected. Program terminated.");
+        } finally {
+            scan.close();
+        }
+    }
+}

core-java-modules/core-java-26/src/main/java/baeldung/scannerinput/SampleScanner.java

@@ -0,0 +1,19 @@
+package com.baeldung.scannerinput;
+
+import java.util.Scanner;
+
+public class SampleScanner {
+
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+
+        try {
+            while (scan.hasNextLine()) {
+                String line = scan.nextLine().toLowerCase();
+                System.out.println(line);
+            }
+        } finally {
+            scan.close();
+        }
+    }
+}

core-java-modules/core-java-26/src/main/java/baeldung/scannerinput/SampleScannerScan.java

@@ -0,0 +1,21 @@
+package com.baeldung.scannerinput;
+
+import java.util.Scanner;
+
+public class SampleScannerScan {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        try {
+            while (scan.hasNextLine()) {
+                String line = scan.nextLine();
+                if (line == null) {
+                    System.out.println("Exiting program (null check)...");
+                    System.exit(0);
+                }
+                System.out.println("Input was: " + line);
+            }
+        } finally {
+            scan.close();
+        }
+    }
+}

core-java-modules/core-java-26/src/main/java/baeldung/scannerinput/SampleScannerSentinel.java

@@ -0,0 +1,21 @@
+package com.baeldung.scannerinput;
+
+import java.util.Scanner;
+
+public class SampleScannerSentinel {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+        try {
+            while (scan.hasNextLine()) {
+                String line = scan.nextLine().toLowerCase();
+                if (line.equals("exit")) {
+                    System.out.println("Exiting program...");
+                    break;
+                }
+                System.out.println(line);
+            }
+        } finally {
+            scan.close();
+        }
+    }
+}