Object-Oriented Programming (Narva College) 2017/18 spring

Session 1

Strings

A string is any sequence of characters – letters, digits, spaces, punctuation, and other “special characters” placed between the quotes.

A few examples on strings: "abc", "12345", "<}{>", "!", "".

To print something out, use one of the following statements:

//if a statement has to be printed and the cursor must be placed on a new line, use println
System.out.println("Hello, world!") 

// if several print statements have to be printed  on the same line, use print
System.out.print("Hello, world!") 

These statements are used to print out the string "Hello, world!".

• println or print - these methods print a line of text;
• System class and its out stream are used to access the print method;
• a string must be surrounded by a pair of double quotes.

Non-printable and control characters can be represented by an escape sequence, which begins with a back-slash \ followed by a pattern. The commonly-used escape sequences are:

public class HelloWorld {
    public static void main(String[] args){
        String word = "Hello";
        System.out.println(word + ", World!");
        System.out.println(word + 123);
        System.out.println(123 + "123" + 12 +3);
    }
}

Session 1