The following lists the most common string operations.

Command Description

"Testing".equals(text1);                Return true if text1 is equal to 

"Testing". The check is case-sensitive.

"Testing".equalsIgnoreCase(text1);       Return true if text1 is equal to "Testing". The check is not case-sensitive. For example, it would also be true for"testing".

StringBuilder str1 = new StringBuilder();    Define a new StringBuilder which allows to efficiently add "Strings".

str.charat(1);                  Return the character at position 1. (Note: strings are arrays of chars starting with 0)

str.substring(1);                       Removes the first characters.

str.substring(1, 5);          Gets the substring from the second to the fifth character.

str.indexOf("Test")            Look for the String "Test" in String str. Returns the index of the first occurrence of the specified string.

str.lastIndexOf("ing")                  Returns the index of the last occurrence of the specifiedString "ing" in the String str.

str.endsWith("ing")            Returns true if str ends with String "ing"

str.startsWith("Test")      Returns true if String str starts with String"Test"

.

str.trim()                               Removes leading and trailing spaces.

str.replace(str1, str2)                  Replaces all occurrences of str1 by str2

str2.concat(str1);                         Concatenates str1 at the end of str2.

str.toLowerCase() / str.toUpperCase()      Converts the string to lower- or uppercase

str1 + str2                                   Concatenate str1 and str2