From f66f24dd73378eefbd3d695aac98565024babfcf Mon Sep 17 00:00:00 2001
From: SensehacK <kautilyasave@gmail.com>
Date: Thu, 8 Aug 2024 10:22:15 -0600
Subject: [PATCH] (backend) lang: hello world

---
 backend/cPlusPlus/README_c_plus_plus.md |  3 ++
 backend/cPlusPlus/pointer.md            |  7 +++++
 backend/java/README_java.md             |  2 ++
 backend/java/hello_world.md             | 38 +++++++++++++++++++++++++
 backend/java/install.md                 |  0
 backend/ruby/README_ruby.md             |  2 +-
 6 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 backend/cPlusPlus/README_c_plus_plus.md
 create mode 100644 backend/cPlusPlus/pointer.md
 create mode 100644 backend/java/README_java.md
 create mode 100644 backend/java/hello_world.md
 create mode 100644 backend/java/install.md

diff --git a/backend/cPlusPlus/README_c_plus_plus.md b/backend/cPlusPlus/README_c_plus_plus.md
new file mode 100644
index 00000000..58f72101
--- /dev/null
+++ b/backend/cPlusPlus/README_c_plus_plus.md
@@ -0,0 +1,3 @@
+
+
+[pointer](pointer.md)
\ No newline at end of file
diff --git a/backend/cPlusPlus/pointer.md b/backend/cPlusPlus/pointer.md
new file mode 100644
index 00000000..fbc5ef71
--- /dev/null
+++ b/backend/cPlusPlus/pointer.md
@@ -0,0 +1,7 @@
+
+
+## Dangling pointer
+
+A dangling pointer is a (non-NULL) pointer which points to unallocated (already freed) memory area.
+
+[wiki](https://en.wikipedia.org/wiki/Dangling_pointer)
\ No newline at end of file
diff --git a/backend/java/README_java.md b/backend/java/README_java.md
new file mode 100644
index 00000000..51f4e869
--- /dev/null
+++ b/backend/java/README_java.md
@@ -0,0 +1,2 @@
+
+[install](backend/java/install.md)
\ No newline at end of file
diff --git a/backend/java/hello_world.md b/backend/java/hello_world.md
new file mode 100644
index 00000000..47ef1178
--- /dev/null
+++ b/backend/java/hello_world.md
@@ -0,0 +1,38 @@
+
+
+## Code
+
+```java
+class Test  
+{  
+    public static void main(String []args)  
+    {  
+        System.out.println("My First Java Program.");  
+    }  
+};
+```
+
+
+## Compile
+
+To compile the program, we must run the Java compiler (javac), with the name of the source file on the “command prompt” like as follows
+
+If everything is OK, the `javac` compiler creates a file called “Test.class” containing the byte code of the program.
+
+```sh
+javac HelloWorld.java
+```
+
+## Execute
+
+- Create the program by typing it into a text editor and saving it to a file – HelloWorld.java.
+- Compile it by typing “javac HelloWorld.java” in the terminal window.
+- Execute (or run) it by typing “java HelloWorld” in the terminal window.
+
+```sh
+java HelloWorld
+```
+
+## Resource
+
+[GfG | hello world ex](https://www.geeksforgeeks.org/java-hello-world-program/)
\ No newline at end of file
diff --git a/backend/java/install.md b/backend/java/install.md
new file mode 100644
index 00000000..e69de29b
diff --git a/backend/ruby/README_ruby.md b/backend/ruby/README_ruby.md
index 2058c9cb..464458fc 100644
--- a/backend/ruby/README_ruby.md
+++ b/backend/ruby/README_ruby.md
@@ -2,7 +2,7 @@
 
 [documentation](backend/ruby/documentation.md)
 
-[[hello_world]]
+[[backend/ruby/hello_world]]
 
 [[backend/ruby/ternary]]