The meaning of the word “default” is “implicit”, or “that if none is given”. Here in makefiles, it would be if you call >make without a goal explicitly stated, then the first target in your makefile (other than ones starting with .) is updated. So it makes sense for the first such target to be … Read more
Try the following. I don’t know what sort you’re applying (if any), so I’m just not doing one. public String[] permutations(String str) { if (str.length() == 0) { return new String[0]; } else if (str.length() == 1) { String[] s = new String[1]; s[0] = str; return s; } Set<String> permutations = new HashSet<>(); for … Read more
This code would not compile: if (gamepad1.left_stick_y>50) mainArm.setDirection(DIRECTION_FORWARD), mainArm.setPower(50); // ^ Your attempt at converting multiple operations into one by placing a comma would not work: JLS 15.27: Unlike C and C++, the Java programming language has no comma operator. One approach is to allow changing power and direction in a single call: if (gamepad1.left_stick_y … Read more
In Java it’s Thread.sleep(500); with capital letter. Edit Date_Time is your class. If you want to print the date you need to use Date library Date d = new Date(); System.out.print(d); 7 solved could not find symbol thread.sleep [closed]
public class Program { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub String str = “a11b4c5”; System.out.println(getAnswerByPassingString(str)); } public static String getAnswerByPassingString(String str) { String number = “”; String letter = “”; String resStr = “”; ArrayList<String> stringList = new ArrayList<String>(); ArrayList<String> numbersList = new ArrayList<String>(); for … Read more
You have a conflict there with the name Menu. You need to import the proper classes.Use java.awt.Menu m1=new java.awt.Menu(); if you want to go with your class name as Menu or else change your class name to some other name and import a Menu class. solved i am getting an error in adding a menu … Read more
You can use List<List<String>> instead for example : List<List<String>> arrList = new ArrayList<>(); for (int i = 0; i < 5; i++) { List<String> arr = new ArrayList<>(); arr.add(“a” + i); arr.add(“b” + i); arr.add(“c” + i); arrList.add(arr); } System.out.println(arrList); Output [[a0, b0, c0], [a1, b1, c1], [a2, b2, c2], [a3, b3, c3], [a4, b4, … Read more
You can use indices instead of nodes but you need somewhere nodes and/or vertices. solved huffman without using node [closed]
It seems you are stuck because you are not familiar with the modelisation effort of going from the assignment statement to a solution design. This is a difficult task for everybody, not just beginners. But in your assignment you already got some guidelines. First you have to understand what do you get as input and … Read more
Compilers are not predictive to get the result exactly in the format humans want. They obviously work on the limited syntax and semantics rule and as per some grammar (or rules you can say). Errors are also Exceptions in Java that define exceptions which aren’t expected to be caught under normal circumstances. So basically, an … Read more
You just stop the program by adding the line System.exit(0);, like int value=sc.nextInt(); if (value>10){ System.exit(0); } This terminates the running JVM and — of course — the program running on it. solved How to stop the run of the program in java? [duplicate]
Trying to put a HashMap as a key inside itself is a bad idea. After hm.put(hm,hm), your HashMap contains a key whose hashCode() is hm.hashCode(). hm.hashCode() is a function of the hashCode() of all the Map‘s entries. The hashCode() of an entry is a function of the hashCode() of the key and value (both are … Read more
That method is not static so you will need an instance of stringFilter to invoke that method. You are calling an instance method on a null instance of stringFilter 0 solved java.lang.NullPointerException: Attempt to invoke virtual method java.lang.String [duplicate]
Use below code Calendar c = Calendar.getInstance(); SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”); String date = new SimpleDateFormat(“yyyy-MM-dd”, Locale.getDefault()).format(new Date()); c.setTime(sdf.parse(date)); c.add(Calendar.DATE, -30); Date newDate = c.getTime(); solved How to subtract 30 days from current date [closed]
An int prepended with 0in Java represents an Octal, which means you count to 7, then represent the (decimal) value of 8 as 10, and continue form there. As an example / for comparison: Decimal Octal 8 10 9 11 10 12 11 13 16 20 17 21 24 30 25 31 64 100 65 … Read more