String

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html

Trim/Length

In this example result is a String

result.trim().length()

Compare

Compares this String to another String, ignoring case considerations. Returns a boolean

equalsIgnoreCase(String anotherString)

Compares two strings lexicographically, ignoring case differences.

  • Returns an int

  • PROBABLY BETTER TO USE equalsIgnoreCase

compareToIgnoreCase(String str)

Contains

if (os.indexOf("linux") != -1) {

General String Handling

An untidy bit of code which:

  • finds the index of a string withing another string

  • extracts a substring

  • iterates through a string

  • extracts individual characters from a string

  • tests a character to see if it is a digit (numeric)

  • convert a string to an integer

    int startBody = responseBody.indexOf(BODY_TAG);
int endBody = responseBody.indexOf("</body>");

String result = "";
String body = responseBody.substring(startBody + BODY_TAG.length(), endBody);
for (int i = 0; i < body.length(); i++) {
   char c = body.charAt(i);
   if (Character.isDigit(c)) {
       result = result + c;
   }
}
return Integer.parseInt(result);

MessageFormat

import java.text.MessageFormat;

String result = MessageFormat.format(
    "The book with title {0} is sold with price {1,number,currency} to {2}",
    new Object[] {title, price, buyername});

logger.info(MessageFormat.format("create(userId:{0},name:{1},filename:{2},original:{3})",
    userId, name, filename, original));

Pad

See String Utilities in The Apache, Jakarta Project - Commons Lang, Commons Lang

Replace

See code snippets, AlphaNumeric and Spaces, String to see how to use replaceAll.

Split

The following example illustrates how the String.split method can be used to break up a string into its basic tokens:

String[] result = "this is a test".split("\\s");
for (int x = 0; x < result.length; x++) {
   System.out.println(result[x]);
}

String Buffer

To use a string buffer for building strings…

StringBuffer result = new StringBuffer();
result.append("Cluster TCP Port: ");
result.append("\r\nColdFusion HTTP Port: ");
return result.toString();

Quick Cheap Win with StringBuilder