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法学如何在Java中从ArrayList或LinkedList中删除元素？
ArrayList和LinkedList类实现了java.util包中的List接口。此接口提供了两种变体的remove()方法来删除特定元素，如下所示：
E remove(int index)
boolean remove(Object o) −
使用其中一种方法，您可以从Java中的List或LinkedList中删除所需元素。
E remove(int index) − 此方法接受一个整数，表示List对象中的特定位置，并删除给定位置的元素。如果删除操作成功，此方法将返回已删除的元素。
如果传递给此方法的索引值小于0或大于列表大小减1，则会引发IndexOutOfBoundsException异常。
示例
import java.util.ArrayList;
public class RemoveExample {
public static void main(String[] args) {
//Instantiating an ArrayList object
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("JavaFX");
arrayList.add("Java");
arrayList.add("WebGL");
arrayList.add("OpenCV");
System.out.println("Contents of the Array List: "+arrayList);
//Removing elements
System.out.println("Elements removed: ");
System.out.println(arrayList.remove(0));
System.out.println(arrayList.remove(2));
System.out.println(" ");
//Instantiating an LinkedList object
ArrayList<String> linkedList = new ArrayList<String>();
linkedList.add("Krishna");
linkedList.add("Satish");
linkedList.add("Mohan");
linkedList.add("Radha");
System.out.println("Contents of the linked List: "+arrayList);
//Removing elements
System.out.println("Elements removed: ");
System.out.println(linkedList.remove(0));
System.out.println(linkedList.remove(2));
}
}输出
Contents of the Array List: [JavaFx, Java, WebGL, OpenCV] Elements removed: JavaFX OpenCV Contents of the linked List: [Java, WebGL] Elements removed: Krishna Radha
boolean remove(Object o) − 此方法接受一个表示List中元素的对象，并删除给定元素的第一次出现。此方法返回一个布尔值，表示：
true，如果操作成功。
false，如果操作不成功。
示例
import java.util.ArrayList;
public class RemoveExample {
public static void main(String[] args) {
//Instantiating an ArrayList object
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("JavaFX");
arrayList.add("Java");
arrayList.add("WebGL");
arrayList.add("OpenCV");
System.out.println("Contents of the Array List: "+arrayList);
//Removing elements
System.out.println("Elements removed: ");
System.out.println(arrayList.remove("JavaFX"));
System.out.println(arrayList.remove("WebGL"));
System.out.println("Contents of the array List after removing elements: "+arrayList);
System.out.println(" ");
//Instantiating an LinkedList object
ArrayList<String> linkedList = new ArrayList<String>();
linkedList.add("Krishna");
linkedList.add("Satish");
linkedList.add("Mohan");
linkedList.add("Radha");
System.out.println("Contents of the linked List: "+linkedList);
//Removing elements
System.out.println("Elements removed: ");
System.out.println(linkedList.remove("Satish"));
System.out.println(linkedList.remove("Mohan"));
System.out.println("Contents of the linked List after removing elements: "+linkedList);
}
}输出
Contents of the Array List: [JavaFX, Java, WebGL, OpenCV] Elements removed: true true Contents of the array List after removing elements: [Java, OpenCV] Contents of the linked List: [Krishna, Satish, Mohan, Radha] Elements removed: true true Contents of the linked List after removing elements: [Krishna, Radha]
Iterator对象的remove()方法
除了这两种方法之外，您还可以使用Iterator类的remove()方法删除LinkedList或ArrayList对象的元素。
示例
import java.util.ArrayList;
import java.util.Iterator;
public class RemoveExample {
public static void main(String[] args) {
//Instantiating an ArrayList object
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("JavaFX");
arrayList.add("Java");
arrayList.add("WebGL");
arrayList.add("OpenCV");
System.out.println("Contents of the Array List: "+arrayList);
//Retrieving the Iterator object
Iterator<String> it1 = arrayList.iterator();
it1.next();
it1.remove();
System.out.println("Contents of the array List after removing elements: ");
while(it1.hasNext()) {
System.out.println(it1.next());
}
//Instantiating an LinkedList object
ArrayList<String> linkedList = new ArrayList<String>();
linkedList.add("Krishna");
linkedList.add("Satish");
linkedList.add("Mohan");
linkedList.add("Radha");
System.out.println("Contents of the linked List: "+linkedList);
//Retrieving the Iterator object
Iterator<String> it2 = linkedList.iterator();
it2.next();
it2.remove();
System.out.println("Contents of the linked List after removing elements: ");
while(it2.hasNext()) {
System.out.println(it2.next());
}
}
}输出
Contents of the Array List: [JavaFX, Java, WebGL, OpenCV] Contents of the array List after removing elements: Java WebGL OpenCV Contents of the linked List: [Krishna, Satish, Mohan, Radha] Contents of the linked List after removing elements: Satish Mohan Radha
更新于：2020年2月17日
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