Create 5 Golden Rules of Strings in Java.md

Author: darshanr27

Strings/5 Golden Rules of Strings in Java.md

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+## 5 Golden Rules of Strings in Java
+
+
+1. If we create a string without using `new` operator the string object will be created in the **constant pool**.
+``` 
+  String s1 = "Spring";
+```
+
+2. If we create a string using `new` operator the string object will be created in the **non-constant pool**.
+```
+  String s2 = new String("Java");
+```
+
+3. If we create a string by **concatinating two raw strings**, the string object will be created in the **constant pool**.
+```
+  String s3 = "Mark" + "Down";
+```
+
+4. If we crate a string by **concatinating the two strings by using the reference variables**, then the string object will be created in the **non-constant pool**.
+```
+  String s4 = "Two";
+  String s5 = "Thousand";
+  String s6 = s4 + s5;
+```
+
+5. If we assign **string reference variable to another string reference variable**, the refence would be copied, then the **both reference variable refer to the same string object**.
+```
+  String s7 = "Keyboard";
+  String s8 = s7;
+```