1. Java Strings in 10 minutes

2. Declaring/creating a new String
String strName = "";
String str = "WLCS";
String str2 = "Hello";
//String is the type name

3. Size/length of a string
String str = "WLCS";
System.out.println( str.length() );
//returns 4

4. String Library of Methods
Strings have many pre-made methods in Java
Examples
length()
equals()
substring()
Etc.
Java String Library

5. Comparing if Strings are equal
== does NOT work
Must use the .equals() method
str2.equals("Hello"); //returns true
strName.equals(str2); //return false

6. Substrings (Strings slices)
strName.substring(a,b)
Returns a substring from index a up to b (exclusive)
String str = "Hello, world";
System.out.println( str.substring(0,5) );
//returns Hello
System.out.println( str.substring(7, str.length()) );
//returns World

7. Searching for a substring
strName.indexOf(String substr) returns the index of the specific substr
String str = "Hello, world";
System.out.println( str.indexOf(",") );
//returns 5
System.out.println( str.indexOf("wo") );
//returns 7
System.out.println( str.indexOf("qwerty") );
//returns -1

8. Comparing Strings alphabetically
strName.compareTo(String str) returns an integer indicating alphabetical order
String str1 = "abc";
String str2 = "def";
System.out.println(str1.compareTo(str2)); //returns -3
System.out.println(str1.compareTo(str1)); //returns 0
System.out.println(str2.compareTo(str1)); //returns 3

9. compareTo() example String str1 = "abc"; String str2 = "def";
if (str1.compareTo(str2) < 0) {
System.out.println(str1 + " goes before " + str2); }

10. Other useful String methods
toLowerCase()
toUpperCase()
trim()
split()