A literal character is delimited by single quotes.
Characters can be classified as letters (upper and lower case), digits, punctuation, operators, and control characters.
Back slash is the escape character.
See TestChar.java
Strings are sequences of characters bracketed by double quotes.
Strings can be appended using the + operator.
See TestString1.java
Like most objects, a string object can execute methods. The methods a string object can executed are documented at:
http://java.sun.com/javase/6/docs/api/
These methods include:
Indexing and length methods
Methods for inspecting and replacing substrings
See TestString2.java
Write a Java program that allows a user to type in simple arithmetical expressions of the form:
<Number> + <Number>
Your program computes and displays the sum.
Hint: Use Java's Scanner class in the java.util package to read input from the user:
java.util.Scanner keyboard = new java.util.Scanner(System.in);