4/13/2023 0 Comments Kotlin list to stringIn Java, vararg parameters must be declared as the last parameter. Constructors 1) ArrayList (): Creates an empty ArrayList 2) ArrayList (capacity: Int): Creates an ArrayList of specified size.Basically, it copies all elements from the original array to a new one and passes the copied one to the sum() function. We use ArrayList to access the index of the specified element, convert an Arraylist into string or another array and many more functionalities. Index 13 and 14 are loading two parameters into the operand stack and then passing them to the pyOf(int, int) method. Then it will pass the new array as the vararg parameter: 12: aload_0 // loads the intġ5: invokestatic #71 // Method java/util/pyOf:([II)[I Kotlin will use the pyOf(array, length) method to first create a copy of the spreading array. Moreover, when using the spread operator: val numbers = intArrayOf(1, 2) Also, the ACC_VARARGS flag specifies that the function accepts a variable-length parameter. You can simply call it like this: list.joinToString()) Because by default it uses comma as separator but you can also pass your own separator as parameter, this method takes quite a few parameters aside from separator, which allow to do a lot of formatting, like prefix, postfix and more. After that, we can take a peek at the generated bytecode via javap: $ javap -c -p -v įlags: (0x0099) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_VARARGSĪs shown above, the vararg parameter is defined as a vararg in Java. Kotlin as well has method for that, its called joinToString.
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