Strings are immutable in Java – operations like replace don’t actually update the original string. You have to use the return value of the substring call, e.g. String updated = str.substring(j,str.indexOf(‘>’,j+1)).replaceAll(“\n”, “#10”); If you want to replace this in the overall string, you can simply concatenate this back into the string: int indexOf = str.indexOf(‘>’,j+1); … Read more
The solution may be, that you need to put your statements in brackets. else if ((address.getLastName() != null ? address.getLastName().toLowerCase().contains(searchKey) : false) || (address.getFirstName() != null ? address.getFirstName().toLowerCase().contains(searchKey) : false) || (address.getTitle() != null ? address.getTitle().toLowerCase().contains(searchKey) : false) || (address.getStreet() != null ? address.getStreet().toLowerCase().contains(searchKey) : false) || Integer.toString(address.getPlz()).equals(searchKey)) { outputList.add(address); Otherwise the statements are not … Read more
Each time you fill a bucket of 10 liters, you will have 10 fewer liters in your source bucket. Each time you fill a bucket of 2 liters, you will have 2 fewer liters in your source bucket. Each time you fill a bucket of 50 liters, you will have 50 fewer liters in your … Read more
while (true) { System.out.println(“What type of Employee? Enter ‘o’ for Office ” + “Clerical, ‘f’ for Factory, or ‘s’ for Saleperson. Enter ‘x’ to exit.” ); String response= inp.nextLine().toLowerCase(); // validate input, do you switch statement, return; on x } 1 solved Trying to sentinel loop this program [closed]
A static variable is a variable: public static int whatever = 0; A static method is a method: public static void whatever() {} A static class is a class: public static class SomeInnerClass {} (A class can only have the static modifier when it is nested inside another class) Static variables and methods can be … Read more
Use BigInteger or BigDecimal class and make use of their divide() method. 3 solved Java how to divide very large numbers [closed]
In this case (when the token defining it as a number is at the beginning): final String input = “Rp.1.000.000.000”; int value = 0; String token = “Rp”; if (input.contains(token)) value = Integer.parseInt(input.replaceAll(“[^012456789]”, “”)); Explanation .replaceAll(“[^012456789]”, “”) removes all non-numeric chars (R, P and . in this case). So the leftover is a String only … Read more
In fact conceptually they are not different, in both cases a copy of the original value is passed in as an argument to the method. The thing is that in the first case you have a complex/composite structure of some sort so you pass in a reference copy which is different from the original reference … Read more
First error: System.out.println(“the biggest value is: “+n+” and it is occurs “+H+” times”);}} The n is your TryCount. Should be: System.out.println(“the biggest value is: “+y+” and it is occurs “+H+” times”);}} Second error: You are increasing the count of the “highest” number: else if(y==f) H++; – but you are NOT taking into account, what should … Read more
Assuming you have a string of digits (e.g. “123”), you can use toCharArray() instead: for (char c : pesel.toCharArray()) { temp += 3 * (c – ‘0’); } This avoids Integer.parseInt() altogether. If you want to ensure that each character is a digit, you can use Character.isDigit(). Your error is because str.split(“”) contains a leading … Read more
It is named Exchange sort and is sometimes confused with bubble sort. While Bubble sort compares adjacent elements, Exchange sort compares the first element with all the following elements and swaps if needed. Then it does the same for the second element and so on. 0 solved What is this inefficient sorting algorithm with two … Read more
ZoneId defaultZoneId = ZoneId.systemDefault(); String issueDate1=”01/01/2017″; Date issueDate2=new SimpleDateFormat(“dd/MM/yyyy”).parse(issueDate1); String dateTo1=”31/12/2018″; Date dateTo2=new SimpleDateFormat(“dd/MM/yyyy”).parse(dateTo1); here year month days can find easily.This giving ans of all question. Instant instant = issueDate2.toInstant(); LocalDate localDatestart = instant.atZone(defaultZoneId).toLocalDate(); Instant instant1 = dateTo2.toInstant(); LocalDate localDateend = instant1.atZone(defaultZoneId).toLocalDate().plusDays(1); Period diff = Period.between(localDatestart, localDateend); System.out.printf(“\nDifference is %d years, %d months and %d … Read more
No doubt your code works even without the interface at this moment, but. Implementing an interface allows a class to become more formal about the behavior it promises to provide. Interfaces form a contract between the class and the outside world, and this contract is enforced at build time by the compiler. If your class … Read more
You need to edit your question in order to make it more clear so you’ll get the help you want. I guess you were trying to get a number from the user, than create an ‘array’ of that number size. Afterwards you want to assign random ‘int’, ranging 0-100 (100 exclusive), for each array index. … Read more
Math.random() exists. Math.random(int) does not exist. You may be getting that mixed up with the Random class constructor, which takes a long as a seed value, meaning your results will be pseudorandom and by consequence, repeatable. If you wanted a number between 0 and 99 I actually would recommend that you use Random. You can … Read more