CIS 260 Chapter16d.java

Code

/*
    Chapter16d.java
    CIS 260
    David Klick
    2016-02-15

    This program demonstrates the StringBuilder class.
    
    String is great for simple tasks, and it has the advantage of having
    immutable objects and built-in language support such as String literals
    and the concatenation operator.
    
    StringBuilder is much more efficient than String if you want to modify
    String objects since you won't be constantly creating and disposing of
    objects, but rather modifying an existing object. You no longer have
    built-in language support, such as a concatenation operator or
    StringBuilder literals. You also have to convert StringBuilder objects
    to String objects (toString) if you want to use them for printing, etc.
    StringBuilder objects are NOT thread safe.
    
    StringBuffer objects are similar to StringBuilder, but thread safe. That
    also means that StringBuffer objects are much slower than Stringbuilder
    objects.
*/

public class Chapter16d {
    public static void main(String[] args) {
        // StringBuffer is similar, but thread safe (and therefore much slower)
        StringBuilder sb = new StringBuilder();
        for (int i=0; i<=9; i++) sb.append(i);
        for (char c='a'; c<='z'; c++) sb.append(c);
        for (char c='A'; c<='Z'; c++) sb.append(c);
        System.out.println(sb.toString());
    }
}