如何在 Java 中从列表中移除子列表
给定一个 Java 中的列表,任务是移除子列表中的所有元素,这些元素的索引介于 fromIndex(包含)和 toIndex(排除)之间。索引的范围由用户定义。
示例:
输入列表= [1,2,3,4,5,6,7,8],fromIndex = 2,endIndex = 4 输出【1,2,5,6,7,8】
输入列表= ['G ',' E ',' E ',' G ',' K ',' S'],fromIndex = 3,endIndex = 5 输出 ['G ',' E ',' E ',' K ',' S']
-
方法 1:使用 subList()和 clear()方法
语法:
```java List.subList(int fromIndex, int toIndex).clear()
```
示例:
```java // Java code to remove a subList using // subList(a, b).clear() method
import java.util.*;
public class AbstractListDemo { public static void main(String args[]) {
// Creating an empty AbstractList AbstractList list = new LinkedList();
// Using add() method // to add elements in the list list.add("GFG"); list.add("for"); list.add("Geeks"); list.add("computer"); list.add("portal");
// Output the list System.out.println("Original List: " + list);
// subList and clear method // to remove elements // specified in the range list.subList(1, 3).clear();
// Print the final list System.out.println("Final List: " + list); } } ```
Output:
```java Original List: [GFG, for, Geeks, computer, portal] Final List: [GFG, computer, portal]
```
注意:可以继承抽象列表的类:
语法:
```java List.removeRange(int fromIndex, int toIndex)
```
示例:
```java // Java code to remove a subList // using removeRange() method
import java.util.*;
// since removeRange() is a protected method // ArrayList has to be extend the class public class GFG extends ArrayList {
public static void main(String[] args) {
// create an empty array list
GFG arr = new GFG();
// use add() method // to add values in the list arr.add(1); arr.add(2); arr.add(3); arr.add(4); arr.add(5); arr.add(6); arr.add(7); arr.add(8);
// prints the list before removing System.out.println("Original List: " + arr);
// removing elements in the list // from index 2 to 4 arr.removeRange(2, 4); System.out.println("Final List: " + arr); } } ```
Output:
```java Original List: [1, 2, 3, 4, 5, 6, 7, 8] Final List: [1, 2, 5, 6, 7, 8]
```
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