Java Stack lastIndexOf()用法及代碼示例

Java.util.Stack.lastIndexOf(Object element)方法用於檢查並查找Stack中特定元素的出現。如果元素存在於堆棧中，則lastIndexOf()方法將返回該元素最後一次出現的索引，否則將返回-1。此方法用於查找堆棧中特定元素的最後一次出現。

用法:

Stack.lastIndexOf(Object element)

參數：參數element 的類型為Stack。它指的是需要檢查其最後一次出現的元素。

返回值：該方法返回元素在堆棧中最後一次出現的位置。如果元素不在堆棧中，則該方法返回-1。返回值是整數類型。

以下示例程序旨在說明Java.util.Stack.lastIndexOf()方法：

示例1:

// Java code to illustrate lastIndexOf() 
import java.util.*; 
  
public class StackDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty Stack 
        Stack<String> stack = new Stack<String>(); 
  
        // Use add() method to add elements in the Stack 
        stack.add("Geeks"); 
        stack.add("for"); 
        stack.add("Geeks"); 
        stack.add("10"); 
        stack.add("20"); 
  
        // Displaying the Stack 
        System.out.println("Stack: " + stack); 
  
        // The last position of an element is returned 
        System.out.println("Last occurrence of Geeks is at index: "
                           + stack.lastIndexOf("Geeks")); 
        System.out.println("Last occurrence of 10 is at index: "
                           + stack.lastIndexOf("10")); 
    } 
}

輸出：

Stack: [Geeks, for, Geeks, 10, 20]
Last occurrence of Geeks is at index: 2
Last occurrence of 10 is at index: 3

示例2:

// Java code to illustrate lastIndexOf() 
import java.util.*; 
  
public class StackDemo { 
    public static void main(String args[]) 
    { 
  
        // Creating an empty Stack 
        Stack<Integer> stack = new Stack<Integer>(); 
  
        // Use add() method to add elements in the Stack 
        stack.add(10); 
        stack.add(22); 
        stack.add(3); 
        stack.add(10); 
        stack.add(20); 
  
        // Displaying the Stack 
        System.out.println("Stack: " + stack); 
  
        // The last position of an element is returned 
        System.out.println("Last occurrence of 10 is at index: "
                           + stack.lastIndexOf(10)); 
        System.out.println("Last occurrence of 20 is at index: "
                           + stack.lastIndexOf(20)); 
    } 
}

輸出：

Stack: [10, 22, 3, 10, 20]
Last occurrence of 10 is at index: 3
Last occurrence of 20 is at index: 4

相關用法

注：本文由純淨天空篩選整理自Code_r大神的英文原創作品 Stack lastIndexOf() method in Java with Example。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。