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法學如何在Java中從ArrayList或LinkedList中刪除元素？
ArrayList和LinkedList類實現了java.util包中的List介面。此介面提供了兩種變體的remove()方法來刪除特定元素，如下所示：
E remove(int index)
boolean remove(Object o) −
使用其中一種方法，您可以從Java中的List或LinkedList中刪除所需元素。
E remove(int index) − 此方法接受一個整數，表示List物件中的特定位置，並刪除給定位置的元素。如果刪除操作成功，此方法將返回已刪除的元素。
如果傳遞給此方法的索引值小於0或大於列表大小減1，則會引發IndexOutOfBoundsException異常。
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));
}
}輸出
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) − 此方法接受一個表示List中元素的物件，並刪除給定元素的第一次出現。此方法返回一個布林值，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);
}
}輸出
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物件的remove()方法
除了這兩種方法之外，您還可以使用Iterator類的remove()方法刪除LinkedList或ArrayList物件的元素。
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());
}
}
}輸出
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
更新於：2020年2月17日
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