Java程序查找元素是否在堆栈中
方法java.util.Stack.search()用于查找元素是否在堆栈中或Java中。该方法采用单个参数，即在堆栈中搜索的元素。如果可用，它返回元素在堆栈中的位置（从1开始计数），如果元素在堆栈中不可用，则返回-1。
演示此的程序如下所示-
示例
import java.util.Stack;
public class Demo {
public static void main (String args[]) {
Stack stack = new Stack();
stack.push("Apple");
stack.push("Mango");
stack.push("Pear");
stack.push("Orange");
stack.push("Guava");
System.out.println("The stack elements are: " + stack);
System.out.println("The element Mango is in the stack at position: " + stack.search("Mango"));
System.out.println("The element Peach is in the stack at position: " + stack.search("Peach"));
}
}输出结果
The stack elements are: [Apple, Mango, Pear, Orange, Guava] The element Mango is in the stack at position: 4 The element Peach is in the stack at position: -1
现在让我们了解上面的程序。
已创建堆栈。然后使用Stack.push()方法将元素添加到堆栈中。将显示堆栈，然后使用Stack.search()方法查找元素“Mango”和“Peach”是否在堆栈中。演示这的代码片段如下-
Stack stack = new Stack();
stack.push("Apple");
stack.push("Mango");
stack.push("Pear");
stack.push("Orange");
stack.push("Guava");
System.out.println("The stack elements are: " + stack);
System.out.println("The element Mango is in the stack at position: " + stack.search("Mango"));
System.out.println("The element Peach is in the stack at position: " + stack.search("Peach"));