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import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.util.ArrayList; class Main { public static void main(String[] args) { // System.out.println("Hello World!"); // LocalDateTime objTime = LocalDateTime.now(); // System.out.println("now : " + objTime); // DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss"); // String objFormat = objTime.format(format); // System.out.println("now with format : " + objFormat); // ArrayList<String> cars = new ArrayList<String>(); // cars.add("Volvo"); // cars.add("BMW"); // cars.add("Benz"); // System.out.println(cars); // System.out.println(cars.get(0)); // System.out.println("Size array : " + cars.size()); // cars.set(0, "new Brand"); // System.out.println(cars.get(0)); // cars.remove(0); // System.out.println("Size array : " + cars.size()); // cars.add("Mazda"); // for (String i : cars) { // System.out.println(i); // } Number num = new Number(); num.tesSort(); } }
import java.util.ArrayList; import java.util.Collections; class Number { ArrayList<Integer> intArr = new ArrayList<Integer>(); public Number() { intArr.add(33); intArr.add(23); intArr.add(10); intArr.add(55); } public void tesSort() { System.out.println("before sort : " + intArr); Collections.sort(intArr); System.out.println("after sort : " + intArr); } }
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