Java CopyOnWriteArrayList subList()用法及代码示例

java.util.CopyOnWriteArrayList类的subList()方法用于返回此列表中指定的fromIndex(包括)和toIndex(不包括)之间的视图。 (如果fromIndex和toIndex相等，则返回的列表为空。)

返回列表由该列表支持，因此返回列表中的非结构更改会反映在此列表中，反之亦然。返回的列表支持所有可选列表操作。

用法:

public List subList(int fromIndex, int toIndex)

参数：此方法将以下参数作为参数。

fromIndex –subList的低端点(包括端点)
toIndex –subList的高端端点(不包括)

返回值：此方法返回此列表内指定范围的视图。

异常：如果端点索引值超出范围(fromIndex大小)，则此方法引发IndexOutOfBoundsException

以下示例说明了subList()方法。

示例1:

// Java program to demonstrate 
// subList() method 
// for String value 
  
import java.util.*; 
import java.util.concurrent.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
  
        try { 
  
            // Creating object of CopyOnWriteArrayList<Integer> 
            CopyOnWriteArrayList<String> 
                arrlist = new CopyOnWriteArrayList<String>(); 
  
            // Populating arrlist1 
            arrlist.add("A"); 
            arrlist.add("B"); 
            arrlist.add("C"); 
            arrlist.add("D"); 
            arrlist.add("E"); 
  
            // print arrlist 
            System.out.println("Original arrlist: "
                               + arrlist); 
  
            // getting the subList 
            // using subList() method 
            List<String> arrlist2 = arrlist.subList(2, 4); 
  
            // print the subList 
            System.out.println("Sublist of arrlist: "
                               + arrlist2); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
}

输出：

Original arrlist: [A, B, C, D, E]
Sublist of arrlist: [C, D]

示例2:对于IndexOutOfBoundsException

// Java program to demonstrate 
// subList() method 
// for IndexOutOfBoundsException 
  
import java.util.*; 
import java.util.concurrent.*; 
  
public class GFG1 { 
    public static void main(String[] argv) 
        throws Exception 
    { 
        try { 
  
            // Creating object of CopyOnWriteArrayList<Integer> 
            CopyOnWriteArrayList<String> 
                arrlist = new CopyOnWriteArrayList<String>(); 
  
            // Populating arrlist1 
            arrlist.add("A"); 
            arrlist.add("B"); 
            arrlist.add("C"); 
            arrlist.add("D"); 
            arrlist.add("E"); 
  
            // print arrlist 
            System.out.println("Original arrlist: "
                               + arrlist); 
  
            // getting the subList 
            // using subList() method 
            System.out.println("\nEnd index value is out of range"); 
            List<String> arrlist2 = arrlist.subList(2, 7); 
  
            // print the subList 
            System.out.println("Sublist of arrlist: "
                               + arrlist2); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
}

输出：

Original arrlist: [A, B, C, D, E]

End index value is out of range
Exception thrown: java.lang.IndexOutOfBoundsException

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注：本文由纯净天空筛选整理自suman_ptnl大神的英文原创作品 CopyOnWriteArrayList subList() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。