liu.ex2; import java.util.Scanner; import java.util.Stack; public class Main { public static Stack<String> operation = new Stack<String>(); //存放运算符 public static Stack<Character> bracket = new Stack<Character>(
/*这是一个模拟模拟栈的题目*/ import java.util.*; import java.io.*; public class Main { public static void main(String [] args) throws Exception { Stack<Integer>stack = new Stack<Integer>(); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int n = Integer...
使用Deque接口作为栈的替代品 importjava.util.ArrayDeque;importjava.util.Deque;publicclassStackExample{privateDeque<Integer>stack;publicStackExample(){stack=newArrayDeque<>();}publicvoidpush(intvalue){stack.push(value);}publicintpop(){returnstack.pop();}publicintpeek(){returnstack.peek();}publicboole...
importjava.util.*; interfaceIntegerStack{ publicIntegerpush(Integeritem); //如果item为null,则不入栈直接返回null。如果栈满,也返回null。如果插入成功,返回item。 publicIntegerpop();//出栈,如果为空,则返回null。出栈时只移动栈顶指针,相应位置不置为null publicIntegerpeek();//获得栈顶元素,如果为空,则...
(Integer.parseInt(keepNum));}else{//判断下一个字符是不是数字,如果是数字,就继续扫描,如果是运算符,则入栈//注意是看后一位,不是index++if(operStack.isOper(expression.substring(index+1,index+2).charAt(0))){//如果后一位是运算符,则入栈 keepNum = "1" 或者 "123"numStack.push(Integer....
}else{//pop出两个数,并运算, 再入栈intnum2 =Integer.parseInt(stack.pop());intnum1 =Integer.parseInt(stack.pop());intres = 0;if(item.equals("+")) { res= num1 +num2; }elseif(item.equals("-")) { res= num1 -num2;
("" + res); } } //最后留在stack中的数据是运算结果 return Integer.parseInt(stack.pop()); } } //编写一个类 Operation 可以返回一个运算符 对应的优先级 class Operation { private static int ADD = 1; private static int SUB = 1; private static int MUL = 2; private static int DIV = ...
6. Search for an Element in a Stack 6.1. Search Stackallows us to search for an elementand get its distance from the top: @Test public void whenElementIsOnStack_thenSearchReturnsItsDistanceFromTheTop() { Stack<Integer> intStack = new Stack<>(); intStack.push(5); intStack.push(8); ...
Indullged+ 关注 园龄:6年3个月粉丝:4关注:14 javaStack Stack基础 总结: 使用ArrayDeque来实现 ArrayDeque<Integer> stack = new ArrayDeque<>(); Stack 常用的方法如下所示。 操作方法 入栈 push(E item) 出栈 pop() 查看栈顶 peek() 为空时返回 null ArrayDeque方法: 1.添加元素 addFirst(E e)在...
Deque<Integer> stack = new ArrayDeque<Integer>(); Since: JDK1.0 See Also: Serialized Form Field Summary Fields inherited from class java.util.Vector capacityIncrement,elementCount,elementData Fields inherited from class java.util.AbstractList