You have a lot of error in your code : First Don’t ever name your variables with Upper letter in beginning, java use camelCase Second Don’t declare your variable with private public in your method. private ArrayList<Object> List = new ArrayList<Object>(); Third You can’t declare a method inside another method you have to close the … Read more
double sum = 0; //use a double instead of a float for (String str : strings) { sum += Double.parseDouble(str); //same as: sum = sum + Double.parseDouble(str); //+= means: add the value from the right of the operator (+=) to the left } System.out.println(sum); 0 solved How to addition of all the elements of an … Read more
Should be : import *.B public class A extends B { private A (java.lang.String[] args) { super(args); } } solved Java: How can I inherit a constructor from a superclass with “java.lang.String[] args” as a parameter?
What happens to b? Nothing happens to b. When you do a = b; you’re copying the value stored in b and putting it in a. (You’re not making a an alias of b.) When you then do a += 1; you’re changing the value stored in a (and the value stored in b remains … Read more
Try this out. This should give you Exception. public static void main(String[] args) throws Exception { Scanner keyboard = new Scanner(System.in); System.out.print(“Enter: “); String entry = keyboard.nextLine(); keyboard.close(); if (entry.length() == 0) { throw new Exception(“Exception Found”); } else { String reverse = reverse(entry); if (reverse.length() == 0) { throw new Exception(“Exception Found”); } else … Read more
int sum = 0; int num; int i = 0; System.out.print(“Enter number: “); num = sc.nextInt(); do{ sum += i; i++; } while ( i <=num ); System.out.println(“The sum is ” + sum); Initialize i to zero, since do-while does first before checking, as opposed to for that checks first before doing. And your do-while … Read more
What do You mean? You have to cast f to long and b to char and also initialize them. l = (long) f; ch = (char) b; //—- float f = 3.14f; long l ; char ch; byte b = 38; l= (long) f; ch= (char) b; Check examples: int first = 3: int second … Read more
You can parse json in Android easily JSONArray jArray = new JSONArray (result); for(int i=0; I<jArray.length; i++){ JSONObject jObject = jArray.getJSONObject(i); String name = jObject.getString(“name”); } 1 solved how to parse the json below into string [duplicate]
From OCP : Oracle Certified Professional Java SE 8 Programmer || Study Guide : Exam 1z0-809 […] Depending on the number of CPUs available in your environment the following is a possible output of the code using a parallel stream […] Even better, the results scale with the number of processors. Scaling is the property … Read more
Here is the closest code: public class Stackoverflow_03262019 { public static void main(String[] args) { int[] arr=new int[5]; Arrays.fill(arr,0); Arrays.stream(arr).forEach(val-> System.out.println(val)); } } “` You can add any value instead of 0; 2 solved Is it possible to do this in Java? [closed]
I think you’ve said why in your question, but just for clarity: Double(double) works just fine if you pass it a float, so there’s no need for Double(float). This is because in a constructor invocation (JLS§5.3), a widening primitive conversion (JLS§5.1.2) is allowed. float to double is a widening primitive conversion. But Float(float) would not … Read more
Android How do I correctly get the value from a Switch? You can refer this link for checking if switch is on or off and accordingly handle visibility of textview.And you can put your date and time picker onclick of textviews Do you need even date and time picker code? solved how to display date … Read more
I am trying to make login module in android studio but i got the error as following..(Column name doesn’t exist) [closed] solved I am trying to make login module in android studio but i got the error as following..(Column name doesn’t exist) [closed]
Your logic to print is fine, all you need to do is to wrap the code into a for loop and excute it from 1 to 100, e.g.: for(int zmienna = 0 ; zmienna <= 100 ; zmienna++){ if (zmienna % 5 == 0 && zmienna % 3 == 0) System.out.println(“FizzBizz”); else if (zmienna % … Read more
your instantiation must be inside a method check the following and under setContentView method TextView tvnum =null; Button btnMin=null; @Override protected void onCreate(Bundle savedInstanceState) //TODO solve runtime problem(E/AndroidRuntime: FATAL EXCEPTION: main) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tvnum = (TextView) findViewById(R.id.TV_num);//creating object of TextView int id = 100;//id is first number of tv num btnMin = (Button) findViewById(R.id.btnMIN); … Read more