String Methods

Author: kishanrajput23

14.String_methods/README.md

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+# Java Tutorial: String Methods in Java
+
+- String Methods operate on Java Strings. They can be used to find the length of the string, convert to lowercase, etc.
+- Some of the commonly used String methods are:
+
+```
+String name = “Kishan”;
+```
+- (Indexes of the above string are as follows: 0-K, 1-i, 2-s, 3-h, 4-a, 5-n)
+
+|  **Methods**  |  **Description**  |
+|:--------------|:------------------|
+|  **1. length()**  |  	Returns the length of String name. (6 in this case)  |
+|  **2. toLowerCase()**  |  Converts all the characters of the string to the lower case letters.  |
+|  **3. toUpperCase()**  |  Converts all the characters of the string to the upper case letters.  |
+|  **4. trim()**  |  Returns a new String after removing all the leading and trailing spaces from the original string.  |
+|  **5. substring(int start)**  |  Returns a substring from start to the end. Substring(3) returns “han”. [Note that indexing starts from 0]  |
+|  **6. substring(int start, int end)**  |  Returns a substring from the start index to the end index. The start index is included, and the end is excluded.  |
+|  **7. replace(‘K’, ‘p’)**  |  Returns a new string after replacing K with p. pishan is returned in this case. (This method takes char as argument)  |
+|  **8. startsWith(“Ki”)**  |  Returns true if the name starts with the string “Ki”. (True in this case)  |
+|  **9. endsWith(“an”)**  |  Returns true if the name ends with the string “an”. (True in this case)  |
+|  **10. charAt(2)**  |  Returns the character at a given index position. (s in this case)  |
+|  **11. indexOf(“s”)**  |  Returns the index of the first occurrence of the specified character in the given string.  |
+|  **12. lastIndexOf(“h”)**  |  Returns the last index of the specified character from the given string. (3 in this case)  |
+|  **13. equals(“Kishan”)**  |  Returns true if the given string is equal to “Kishan” false otherwise [Case sensitive]  |
+|  **14.equalsIgnoreCase(“kishan”)**  |  Returns true if two strings are equal, ignoring the case of characters.  |
+
+### Escape Sequence Characters : 
+- The sequence of characters after backslash ‘\’ = Escape Sequence Characters
+- Escape Sequence Characters consist of more than one character but represent one character when used within the strings.
+- Examples: \n (newline), \t (tab), \’ (single quote), \\ (backslash), etc.
+
+### Code as described in the video
+```
+public class cwh_14_string_methods {
+    public static void main(String[] args) {
+        String name = "Kishan";
+        System.out.println(name);
+        
+        int value = name.length();
+        System.out.println(value);
+
+        String lstring = name.toLowerCase();
+        System.out.println(lstring);
+
+        String ustring = name.toUpperCase();
+        System.out.println(ustring);
+
+        String nonTrimmedString = "     Kishan     ";
+        System.out.println(nonTrimmedString);
+
+        String trimmedString = nonTrimmedString.trim();
+        System.out.println(trimmedString);
+
+        System.out.println(name.substring(1));
+        System.out.println(name.substring(1,5));
+
+        System.out.println(name.replace('K', 'p'));
+        System.out.println(name.replace("n", "ier"));
+
+        System.out.println(name.startsWith("Kis"));
+        System.out.println(name.endsWith("dd"));
+
+        System.out.println(name.charAt(4));
+
+        String modifiedName = "Harryrryrry";
+        System.out.println(modifiedName.indexOf("rry"));
+        System.out.println(modifiedName.indexOf("rry", 4));
+        System.out.println(modifiedName.lastIndexOf("rry", 7));
+
+        System.out.println(name.equals("Kishan"));
+        System.out.println(name.equalsIgnoreCase("KiShAn"));
+
+        System.out.println("I am escape sequence\tdouble quote");
+    }
+}
+```
+
+### Handwritten Notes: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-14/Ch3Strings.pdf)
+
+### Ultimate Java Cheatsheet: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-14/UltimateJavaCheatSheet.pdf)