Java 中的堆栈搜索()方法
原文:https://www.geeksforgeeks.org/stack-search-method-in-java/
java 中的 Java . util . stack . search(Object element)方法是用来在堆栈中搜索一个元素，得到它与顶部的距离。此方法从 1 开始计数，而不是从 0 开始计数。堆栈顶部的元素被认为位于位置 1。如果存在多个元素，则返回最接近顶部的元素的索引。如果成功找到元素，方法返回其位置，如果元素不存在，方法返回-1。
语法:
STACK.search(*element*)
参数:该方法接受一个参数元素，该元素是指堆栈中需要搜索的元素。
返回值:该方法返回元素的位置，如果在堆栈中成功找到(以计数为基数 1)，则返回-1。
以下程序说明了 java.util.Stack.search()方法的工作: 程序 1:
// Java code to demonstrate search() method
import java.util.*;
public class Stack_Demo {
public static void main(String[] args)
{
// Creating an empty Stack
Stack<String> STACK = new Stack<String>();
// Stacking strings
STACK.push("Geeks");
STACK.push("4");
STACK.push("Geeks");
STACK.push("Welcomes");
STACK.push("You");
// Displaying the Stack
System.out.println("The stack is: " + STACK);
// Checking for the element "4"
System.out.println("Does the stack contains '4'? "
+ STACK.search("4"));
// Checking for the element "Hello"
System.out.println("Does the stack contains 'Hello'? "
+ STACK.search("Hello"));
// Checking for the element "Geeks"
System.out.println("Does the stack contains 'Geeks'? "
+ STACK.search("Geeks"));
}
}
Output:
The stack is: [Geeks, 4, Geeks, Welcomes, You]
Does the stack contains '4'? 4
Does the stack contains 'Hello'? -1
Does the stack contains 'Geeks'? 3
程序 2:
// Java code to demonstrate search() method
import java.util.*;
public class Stack_Demo {
public static void main(String[] args)
{
// Creating an empty Stack
Stack<Integer> STACK = new Stack<Integer>();
// Stacking int values
STACK.push(8);
STACK.push(5);
STACK.push(9);
STACK.push(2);
STACK.push(4);
// Displaying the Stack
System.out.println("The stack is: " + STACK);
// Checking for the element 9
System.out.println("Does the stack contains '9'? "
+ STACK.search(9));
// Checking for the element 10
System.out.println("Does the stack contains '10'? "
+ STACK.search(10));
// Checking for the element 11
System.out.println("Does the stack contains '11'? "
+ STACK.search(11));
}
}
Output:
The stack is: [8, 5, 9, 2, 4]
Does the stack contains '9'? 3
Does the stack contains '10'? -1
Does the stack contains '11'? -1
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