importjava.util.HashSet;publicclassHashSetExample{publicstaticvoidmain(String[]args){// 创建 HashSet 并初始化HashSet<String>fruits=newHashSet<>();fruits.add("Apple");fruits.add("Banana");fruits.add("Orange");fruits.add("Apple");// 重复元素,不会添加// 输出 HashSet 的元素System.out.prin...
importjava.util.HashSet;importjava.util.Iterator;publicclassHashSetExample{publicstaticvoidmain(String[]args){// 创建HashSet实例HashSet<String>set=newHashSet<>();// 向HashSet添加元素set.add("Apple");set.add("Banana");set.add("Orange");// 尝试添加重复元素booleanadded=set.add("Apple");Sys...
java.util.LinkedHashSet 类的equals() 方法用于比较指定对象和这个集合是否相等。当且仅当指定的对象也是一个集合,两个集合具有相同的大小,并且两个集合中所有对应的元素对都相等时,返回真。(如果(e1==null ? e2==null : e1.equals(e2)),两个元素e1和e2是相等的)。换句话说,如果两个集合以任何顺序包含...
Example // Import the HashSet class import java.util.HashSet; public class Main { public static void main(String[] args) { HashSet<String> cars = new HashSet<String>(); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"); cars.add("BMW"); cars.add("Mazda"); System.out....
202. Happy Number【leetcode】java,hashSet,算法 202. Happy Number Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and ...
Java中的LinkedHashSet类的 toArray(T[]) 方法用于创建与LinkedHashSet中元素相同的数组。它以正确的顺序返回包含此LinkedHashSet中所有元素的数组;返回的数组的运行时类型是指定数组的类型。如果LinkedHashSet适合于指定数组,则返回该数组。否则,将使用指定数组的运行时类型分配一个新数组,并分配此LinkedHash...
Java example to convert a hashset toarrayusingtoArrray()method. HashSet<String> hashSet =newHashSet<>(); hashSet.add("A"); hashSet.add("B"); hashSet.add("C"); hashSet.add("D"); hashSet.add("E"); String[] values =newString[hashSet.size()]; ...
* * This example creates a hashtable of numbers. It uses the names of * the numbers as keys: * <blockquote> * Hashtable numbers = new Hashtable(); * numbers.put("one", new Integer(1)); * numbers.put("two", new Integer(2)); * numbers.put("three", new Integer(3)); ...
Further looking at the default value passed as a parameter, this is used as the value for each new entry in the map added thoughtadd()oraddAll()methods. The following example shows how this works: ConcurrentHashMap<Integer,String> numbersMap =newConcurrentHashMap<>(); Set<Integer> numbers...
4. HashSet Example HashSet<Dog> dset =newHashSet<Dog>(); dset.add(newDog(2)); dset.add(newDog(1)); dset.add(newDog(3)); dset.add(newDog(5)); dset.add(newDog(4)); Iterator<Dog> iterator =dset.iterator();while(iterator.hasNext()) { ...