栈包含 Java 中的()方法，示例
原文:https://www . geesforgeks . org/stack-contains-in-Java-method-with-example/
Java . util . Stack . contains()方法用于检查堆栈中是否存在特定元素。所以基本上它是用来检查一个堆栈是否包含任何特定的元素。
语法:
Stack.contains(Object element)
参数:该方法取一个强制参数 元素 ，类型为 Stack。这是需要测试堆栈中是否存在的元素。
返回值:如果元素存在于堆栈中，该方法返回 真 ，否则返回假。
下面的程序说明了 Java.util.Stack.contains()方法:
程序 1:
// Java code to illustrate contains()
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 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"));
}
}
Output:
Stack: [Welcome, To, Geeks, 4, Geeks]
Does the Stack contains 'Geeks'? true
Does the Stack contains '4'? true
Does the Stack contains 'No'? false
程序 2:
// Java code to illustrate contains()
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 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"));
}
}
Output:
Stack: [10, 15, 30, 20, 5]
Does the Stack contains 'Geeks'? false
Does the Stack contains '4'? false
Does the Stack contains 'No'? false
版权属于：月萌API www.moonapi.com，转载请注明出处
