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copy() method is available in java.util package.
copy()方法在java.util包中可用。
copy() method is used to copy all the elements from List the src_list (source list) and place all the copied elements into List dst_list (destination list).
copy()方法用于从src_list列表(源列表)中复制所有元素,并将所有复制的元素放入dst_list列表(目标列表)中。
copy() method is a static method, so it is accessible with the class name and if we try to access the method with the class object then we will not get an error.
copy()方法是一个静态方法,因此可以使用类名进行访问,如果尝试使用类对象访问该方法,则不会收到错误。
copy() method may throw an exception at the time of copying elements from one list to another.
将元素从一个列表复制到另一个列表时, copy()方法可能会引发异常。
Syntax:
句法:
public static void copy(List dst_list, List src_list);
Parameter(s):
参数:
List dst_list – represents the destination list.
列表dst_list –表示目标列表。
List src_list – represents the source list.
列表src_list –表示源列表。
Return value:
返回值:
The return type of this method is void, it returns nothing.
此方法的返回类型为void ,不返回任何内容。
Example:
例:
// Java program is to demonstrate the example of// void copy() method of Collections import java.util.*;public class Copy { public static void main(String args[]) { // Instantiate two LinkedList object List < Integer > src_l = new LinkedList < Integer > (); List < Integer > dest_l = new LinkedList < Integer > (); // By using add() method is to add // few elements in src_l src_l.add(10); src_l.add(20); src_l.add(30); src_l.add(40); // By using add() method is to add // few elements in dest_l dest_l.add(60); dest_l.add(70); dest_l.add(80); dest_l.add(90); // Display LinkedList System.out.println("src_l: " + src_l); System.out.println("dest_l: " + dest_l); // By using copy() method is to // copy the elements of src_l into a dest_l Collections.copy(dest_l, src_l); System.out.println(); // Display Copied LinkedList System.out.println("Collections.copy(dest_l, src_l): " + dest_l); }}
Output
输出量
src_l: [10, 20, 30, 40]dest_l: [60, 70, 80, 90]Collections.copy(dest_l, src_l): [10, 20, 30, 40]
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