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java.util.Stack.contains()方法用于检查堆栈中是否存在特定元素。因此，本质上，它用于检查Stack是否包含任何特定元素。
用法:
Stack.contains(Object element)
参数：此方法采用了Stack类型的必需参数element 。如果堆栈中不存在此元素，则需要对其进行测试。
返回值：如果元素存在于堆栈中，则此方法返回True，否则返回False。
以下示例程序旨在说明Java.util.Stack.contains()方法：
示例1:
// Java code to illustrate contains()
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
// Creating an empty Stack
Stack stack = new Stack();
// Use add() method to add elements into the Stack
stack.add("Welcome");
stack.add("To");
stack.add("Geeks");
stack.add("4");
stack.add("Geeks");
// Displaying the Stack
System.out.println("Stack: " + stack);
// Check for "Geeks" in the Stack
System.out.println("Does the Stack contains 'Geeks'? "
+ stack.contains("Geeks"));
// Check for "4" in the Stack
System.out.println("Does the Stack contains '4'? "
+ stack.contains("4"));
// Check if the Queue contains "No"
System.out.println("Does the Stack contains 'No'? "
+ stack.contains("No"));
}
}
输出：
Stack: [Welcome, To, Geeks, 4, Geeks]
Does the Stack contains 'Geeks'? true
Does the Stack contains '4'? true
Does the Stack contains 'No'? false
示例2:
// Java code to illustrate contains()
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
// Creating an empty Stack
Stack stack = new Stack();
// Use add() method to add elements into the Stack
stack.add(10);
stack.add(15);
stack.add(30);
stack.add(20);
stack.add(5);
// Displaying the Stack
System.out.println("Stack: " + stack);
// Check for "Geeks" in the Stack
System.out.println("Does the Stack contains 'Geeks'? "
+ stack.contains("Geeks"));
// Check for "4" in the Stack
System.out.println("Does the Stack contains '4'? "
+ stack.contains("4"));
// Check if the Stack contains "No"
System.out.println("Does the Stack contains 'No'? "
+ stack.contains("No"));
}
}
输出：
Stack: [10, 15, 30, 20, 5]
Does the Stack contains 'Geeks'? false
Does the Stack contains '4'? false
Does the Stack contains 'No'? false
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