java sublist

向量类subList()方法 (Vector Class subList() method)

• subList() method is available in java.util package.

  subList()方法在java.util包中可用。

• subList() method is used to return a set of sublist [it returns all those elements exists in a given range starting index (st_index) and ending index (en_index) and here st_index is inclusive whereas en_index is exclusive].

  subList()方法用于返回一组子列表[它返回给定范围内存在的所有那些元素，即开始索引(st_index)和结束索引(en_index)，其中st_index是包含的，而en_index是排除的]。

• subList() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  subList()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• subList() method may throw an exception at the time of returning sublist.

  subList()方法在返回子列表时可能会引发异常。

  • IndexOutOfBoundsException: This exception may throw when the second parameter is not in a range.IndexOutOfBoundsException ：当第二个参数不在范围内时，可能引发此异常。
  • IllegalArgumentException: This exception may throw when the second argument is not valid.IllegalArgumentException ：当第二个参数无效时，可能引发此异常。

Syntax:

句法：

    public List subList(int st_index, int en_index);

Parameter(s):

参数：

• int st_index – represents the starting position of the returned sublist.

  int st_index –表示返回的子列表的起始位置。

• int en_index – represents the ending position of the returned sublist.

  int en_index –表示返回的子列表的结束位置。

Return value:

返回值：

The return type of the method is List, it returns all the element in a given range and elements are viewed in a List.

方法的返回类型为List ，它返回给定范围内的所有元素，并在List中查看元素。

Example:

例：

// Java program to demonstrate the example 
// of List subList(int st_index, int en_index)
// method of Vector 
import java.util.*;
public class SubListOfVector {
public static void main(String[] args) {
// Instantiates a Vector object  with
// initial capacity of "10"
Vector < String > v = new Vector < String > (10);
List arr_l = new ArrayList();
// By using add() method is to add the
// elements in this v
v.add("C");
v.add("C++");
v.add("JAVA");
// By using add() method is to add the
// elements in this arr_l
arr_l.add("SFDC");
// Display Vector and ArrayList
System.out.println("v: " + v);
System.out.println("arr_l: " + arr_l);
// By using subList() method is to
// return the sublist, starting at one
// endpoint and ending at other endpoint
arr_l = v.subList(0, 2);
// Display updated arr_l
System.out.println("v.subList(0,2): " + arr_l);
}
}

Output

输出量

v: [C, C++, JAVA]
arr_l: [SFDC]
v.subList(0,2): [C, C++]

翻译自: https://www.includehelp.com/java/vector-sublist-method-with-example.aspx

java sublist