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| -rw-r--r-- | java.html.markdown | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/java.html.markdown b/java.html.markdown index fb0913f1..f65c484e 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 --- @@ -171,6 +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 |