Collections and arrays

Collections Method :

public static void main(String[] args) {
    
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(5);
        list.add(4);

        //sort Sort 
        System.out.println(list.toString());
        Collections.sort(list);
        System.out.println(list.toString());

       // binarySearch Two points search 
       int n =  Collections.binarySearch(list,5);
        System.out.println(n);
     // copy Copy 
        List<Integer> list2 = new ArrayList<>();
        for (int i=0;i<5;i++){
    
            list2.add(0);
        }
        // This method requires that the target capacity must be greater than the original target 
        Collections.copy(list2,list);
        System.out.println(list2.toString());
      // reserse reverse 
        Collections.reverse(list);
        System.out.println(list.toString());
       // shuffle  Upset 
        Collections.shuffle(list);
        System.out.println(list);
        //list Turn it into an array 
        Integer[] arr = list.toArray(new Integer[0]);
        System.out.println(arr.length);
        // Array to set 
        String[] namelist ={
    "ls","he"};
        // Restricted set , You can't add or delete 
        List<String> list3 = Arrays.asList(namelist);
        System.out.println(list3.toString());
    }

Arrays Method :

public static void main(String[] args) {
    
        int[] arr = {
    1,2,5,6,3};
        // Array sorting 
// Arrays.sort(arr);
// for (int a:arr
// ) {
    
// System.out.println(a);
// }
        // Print out all the contents of the array 
        System.out.println(Arrays.toString(arr));
        // Compare array elements for equality 
        int[] arr1 = {
    1,2,5,6,3};
        System.out.println(Arrays.equals(arr,arr1));

        //binarysearch  The binary search method finds the index value of the specified element 
        System.out.println(Arrays.binarySearch(arr,2));
        // Intercept array  copeof()
        int n[] = Arrays.copyOf(arr,3);
        System.out.println(Arrays.toString(n));

    }