diff options
Diffstat (limited to 'java.html.markdown')
| -rw-r--r-- | java.html.markdown | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/java.html.markdown b/java.html.markdown index a025bbba..1f7d4115 100644 --- a/java.html.markdown +++ b/java.html.markdown @@ -8,6 +8,7 @@ contributors: - ["Zachary Ferguson", "http://github.com/zfergus2"] - ["Cameron Schermerhorn", "http://github.com/cschermerhorn"] - ["Rachel Stiyer", "https://github.com/rstiyer"] + - ["Michael Dähnert", "http://github.com/JaXt0r"] filename: LearnJava.java --- @@ -23,8 +24,17 @@ Multi-line comments look like this. */ /** -JavaDoc comments look like this. Used to describe the Class or various -attributes of a Class. + * JavaDoc comments look like this. Used to describe the Class or various + * attributes of a Class. + * Main attributes: + * + * @author Name (and contact information such as email) of author(s). + * @version Current version of the program. + * @since When this part of the program was first added. + * @param For describing the different parameters for a method. + * @return For describing what the method returns. + * @deprecated For showing the code is outdated or shouldn't be used. + * @see Links to another part of documentation. */ // Import ArrayList class inside of the java.util package @@ -162,6 +172,29 @@ public class LearnJava { System.out.println(barString); System.out.println(bazString); + // String Building + // #1 - with plus operator + // That's the basic way to do it (optimized under the hood) + String plusConcatenated = "Strings can " + "be concatenated " + "via + operator."; + System.out.println(plusConcatenated); + // Output: Strings can be concatenated via + operator. + + // #2 - with StringBuilder + // This way doesn't create any intermediate strings. It just stores the string pieces, and ties them together + // when toString() is called. + // Hint: This class is not thread safe. A thread-safe alternative (with some impact on performance) is StringBuffer. + StringBuilder builderConcatenated = new StringBuilder(); + builderConcatenated.append("You "); + builderConcatenated.append("can use "); + builderConcatenated.append("the StringBuilder class."); + System.out.println(builderConcatenated.toString()); // only now is the string built + // Output: You can use the StringBuilder class. + + // #3 - with String formatter + // Another alternative way to create strings. Fast and readable. + String.format("%s may prefer %s.", "Or you", "String.format()"); + // Output: Or you may prefer String.format(). + // Arrays // The array size must be decided upon instantiation // The following formats work for declaring an array @@ -199,6 +232,9 @@ public class LearnJava { // interface. This allows the execution time of basic // operations, such as get and insert element, to remain // constant even for large sets. + // TreeMap - This class is a sorted tree structure. It implements a red + // black tree and sorts the entries based on the key value or + // the comparator provided while creating the object /////////////////////////////////////// // Operators |