Java中的堆栈equals（）方法与示例

Java 中 Stack 类的Java Java (Object obj)方法用于验证 Object 与 Stack 的相等性并进行比较。仅当两个 Stack 都包含具有相同顺序的相同元素时，该列表才返回 true。

句法：

first_Stack.equals(second_Stack)

参数：此方法接受一个强制参数second_Stack ，它指的是要与第一个 Stack 进行比较的第二个 Stack。

返回值：如果等式成立并且对象和堆栈都相等，则该方法返回true ，否则返回false 。

以下程序用于说明Java.util.Stack.elements() 方法的工作原理：

方案一：

// Java code to illustrate the equals() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack stack1 = new Stack();
  
        // Inserting elements into the table
        stack1.add("Geeks");
        stack1.add("4");
        stack1.add("Geeks");
        stack1.add("Welcomes");
        stack1.add("You");
  
        // Displaying the Stack
        System.out.println("The Stack is: "
                           + stack1);
  
        // Creating an empty Stack
        Stack stack2 = new Stack();
  
        // Inserting elements into the table
        stack2.add("Geeks");
        stack2.add("4");
        stack2.add("Geeks");
        stack2.add("Welcomes");
        stack2.add("You");
  
        // Displaying the Stack
        System.out.println("The Stack is: "
                           + stack2);
  
        System.out.println("Are both of them equal? "
                           + stack1.equals(stack2));
    }
}

输出：

The Stack is: [Geeks, 4, Geeks, Welcomes, You]
The Stack is: [Geeks, 4, Geeks, Welcomes, You]
Are both of them equal? true

方案二：

// Java code to illustrate the equals() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack stack1 = new Stack();
  
        // Inserting elements into the table
        stack1.add(10);
        stack1.add(15);
        stack1.add(20);
        stack1.add(25);
        stack1.add(30);
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack1);
  
        // Creating an empty Stack
        Stack stack2 = new Stack();
  
        // Inserting elements into the table
        stack2.add(10);
        stack2.add(15);
        stack2.add(20);
        stack2.add(25);
        stack2.add(30);
        stack2.add(40);
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack2);
  
        System.out.println("Are both of them equal? "
                           + stack1.equals(stack2));
    }
}

输出：

The Stack is: [10, 15, 20, 25, 30]
The Stack is: [10, 15, 20, 25, 30, 40]
Are both of them equal? false