Java for Android Cheat Sheet and Quick Ref Version 1 0 Copyright 2015 Ray Wenderlich All rights reserved Source: raywenderlich com Visit for more
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[PDF] Java for Android Cheat Sheet and Quick Reference
Java for Android Cheat Sheet and Quick Ref Version 1 0 Copyright 2015 Ray Wenderlich All rights reserved Source: raywenderlich com Visit for more
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Java for Android Cheat Sheet and Quick Ref Version 1.0. Copyright 2015 Ray Wenderlich. All rights reserved. Source: raywenderlich.com. Visit for more Android resources and tutorials! Class Implementation public class MyClass { public String mString; private int mInt; // More member variables // Constructor for Class public MyClass() { mString = "Foo"; mInt = 10; } // More methods... } Methods public int doIt() { return 0; } public int doIt(int a) { return a; } public int doIt(int a, int b) { return a+b; } Creating/Using an Instance SomeObject a = new SomeObject(); a.getMemberVariable(); a.doIt(); a.doIt(1); a.doIt(2,3); Declaring Variables double doubleVar = 1.0 doubleVar = 2.0 int intVar = 1; String stringVar = "Hey"; Boolean truth = true; Variable types int 1, 2, 500, 10000 float double 1.5, 3.14, 578.234 boolean true, false String "Kermit", "Gonzo", "Ms. Piggy" ClassName Activity, TextView, etc Control Flow Boolean condition = true; if (condition) { } else { } int val = 5; switch (val) { case 1: break; case 2: break; default: break; } for (int i = 0; i < 5; i++) { } String Quick Examples String personOne = "Ray"; String personTwo = "Brian"; String combinedString = personOne + ": Hello, " + personTwo + "!"; String tipString = "2499.00"; Int tipInt = Integer.parseInt(tipString); double tipDouble = Double.parseDouble(tipString); Array Quick Examples String personOne = "Ray"; String personTwo = "Brian"; String [] array = {personOne, personTwo}; for(String person : array) { Log.d("person:", person); } String ray = array[0]; Dictionary Quick Examples HashMap