data[10] = {10,20,30,40,50,60,71,80,90,91}; The above is not correct (syntax error). It means you are assigning an array to data[10] which can hold just an element. If you want to initialize an array, try using Array Initializer: int[] data = {10,20,30,40,50,60,71,80,90,91}; // or int[] data; data = new int[] {10,20,30,40,50,60,71,80,90,91}; Notice the difference between the two … Read more
You can do something like this, it will create array with new size based on provided. String[] temp = new String[] {“water”, “shovel”, “berries”, “stick”, “stone”, “seed”, “axe”}; String[] val = Arrays.copyOf(temp, 20); System.out.println(val.length); System.out.println(Arrays.toString(val)); The output will be: 20 [water, shovel, berries, stick, stone, seed, axe, null, null, null, null, null, null, n
Actually, probably the “best” way to initialize the ArrayList is the method you wrote, as it does not need to create a new List in any way: ArrayList<String> list = new ArrayList<String>(); list.add(“A”); list.add(“B”); list.add(“C”); The catch is that there is quite a bit of typing required to refer to that list instance. There are … Read more
I was trying to make a Minecraft server and got the following error on startup: Error occured during initialization of VM Could not reserve enough space for object heap Error: Could not create the Java Virtual Machine Error: A fatal exception has occurred. Program will exit. I tried everything I could find: I created CLASS … Read more
I was reading a book on Java and came across an example in which an array of type double was initialized in a way that I haven’t seen before. What type of initialization is it and where else can it be used? double m[][]={ {0*0,1*0,2*0,3*0}, {0*1,1*1,2*1,3*1}, {0*2,1*2,2*2,3*2}, {0*3,1*3,2*3,3*3} };
You declared them, but you didn’t initialize them. Initializing them is setting them equal to a value: int a; // This is a declaration a = 0; // This is an initialization int b = 1; // This is a declaration and initialization You get the error because you haven’t initialized the variables, but you … Read more
Everything in a Java program not explicitly set to something by the programmer, is initialized to a zero value. For references (anything that holds an object) that is null. For int/short/byte/long that is a 0. For float/double that is a 0.0 For booleans that is a false. For char that is the null character ‘\u0000’ (whose decimal equivalent is 0). When … Read more
String one, two, three; one = two = three = “”; This should work with immutable objects. It doesn’t make any sense for mutable objects for example: Person firstPerson, secondPerson, thirdPerson; firstPerson = secondPerson = thirdPerson = new Person(); All the variables would be pointing to the same instance. Probably what you would need in … Read more
You need to initialize errorSoon, as indicated by the error message, you have only declared it. String[] errorSoon; // <–declared statement String[] errorSoon = new String[100]; // <–initialized statement You need to initialize the array so it can allocate the correct memory storage for the String elements before you can start setting the index. If you only declare the array (as you did) there is … Read more
How can I initialize a LinkedList with entries/values in it?
