Learn how to check if an ArrayList contains a specific item in Java using various methods and techniques.
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正确做法4:通过 CopyOnWriteArrayList 解决 List的并发问题 publicstaticvoidremove22(ArrayList<String> list,Stringtarget) { finalCopyOnWriteArrayList<String> cowList =newCopyOnWriteArrayList<String>(list);for(Stringitem : cowList) {if(item.equals(target)) { ...
final E element = x.item; final Node<E> next = x.next; final Node<E> prev = x.prev; if (prev == null) { first = next; } else { prev.next = next; x.prev = null; } if (next == null) { last = prev; } else { ...
asList(fruits) .stream() .anyMatch(x -> x.equalsIgnoreCase("lion")); //false 3. Using Iteration Finally, we can always iterate over the array items using the for-each loop and check whether the item is present in the array. int[] intArray = new int[]{1, 2, 3, 4, 5}; ...
11for(Integer value : list) { 12if(2== value) { 13list.remove(value); 14} 15System.out.println(value); 16} 17System.out.println("最后结果="+ list.toString()); 18} 19} 程序运行结果: 1 2 Exception in thread “main” java.util.ConcurrentModificationException ...
publicstaticvoidaddStudent(ArrayList<Student>list){Student stu=newStudent();Scanner sc=newScanner(System.in);System.out.print("请输入学生的学号id:");while(true){int id=sc.nextInt();boolean item=comain(list,id);if(item){System.out.println("此学生已经存在,请重新输入学生id");}else{stu.set...
This post will discuss how to check if a value exists in a List in Java... To check whether a List contains a given element or not, you can simply use the List.contains() method.