import java.util.Scanner;
public class Test {
public static void main(String[] args) {
//测试一下ArrayStack 是否正确
//先创建一个ArrayStack对象->表示栈(容量为10)
ArrayStack stack = new ArrayStack(10);
String key = "";
boolean loop = true; //控制是否退出菜单
Scanner scanner = new Scanner(System.in);
while(loop) {
System.out.println("show: 显示栈");
System.out.println("exit: 退出程序");
System.out.println("push: 入栈");
System.out.println("pop: 出栈");
System.out.println("top: 访问栈顶元素 ");
System.out.println("请输入你的选择(比如输入“show”就会显示栈):");
key = scanner.next();
switch (key) {
case "show":
stack.list();
break;
case "push":
System.out.println("请输入一个数");
int value = scanner.nextInt();
stack.push(value);
break;
case "pop":
try {
int res = stack.pop();
System.out.printf("出栈的数据是 %d\n", res);
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
break;
case "exit":
scanner.close();
loop = false;
break;
case"top":
stack.top();
default:
break;
}
}
System.out.println("程序退出~~~");
}
}
//定义一个 ArrayStack 表示栈
class ArrayStack {
private int maxSize; // 栈的大小
private int[] stack; // 数组,数组模拟栈,数据就放在该数组
private int top = -1;// top表示栈顶,初始化为-1
//构造器
public ArrayStack(int maxSize) {
this.maxSize = maxSize;
stack = new int[maxSize];
}
//栈满
public boolean isFull() {
return top == maxSize - 1;
}
//栈空
public boolean isEmpty() {
return top == -1;
}
//入栈-push
public void push(int value) {
//先判断栈是否满
if(isFull()) {
System.out.println("栈满");
return;
}
top++;
stack[top] = value;
}
//出栈-pop, 将栈顶的数据返回
public int pop() {
//先判断栈是否空
if(isEmpty()) {
//抛出异常
throw new RuntimeException("栈空,没有数据~");
}
int value = stack[top];
top--;
return value;
}
//显示栈的情况[遍历栈], 遍历时,需要从栈顶开始显示数据
public void list() {
if(isEmpty()) {
System.out.println("栈空,没有数据~~");
return;
}
//需要从栈顶开始显示数据
for(int i = top; i >= 0 ; i--) {
System.out.printf("stack[%d]=%d\n", i, stack[i]);
}
}
//访问栈顶元素
public void top() {
if(isEmpty()) {
System.out.println("栈空,没有数据~~");
return;
}
System.out.println(stack[top]);
}
}
//构造器
public ArrayStack(int maxSize) {
this.maxSize = maxSize;
stack = new int[maxSize];
}
//栈满
public boolean isFull() {
return top == maxSize - 1;
}
//栈空
public boolean isEmpty() {
return top == -1;
}
//入栈
public void push(int value) {
//先判断栈是否满
if(isFull()) {
System.out.println("栈满");
return;
}
top++;
stack[top] = value;
}
//出栈-pop, 将栈顶的数据返回
public int pop() {
//先判断栈是否空
if(isEmpty()) {
//抛出异常
throw new RuntimeException("栈空,没有数据~");
}
int value = stack[top];
top--;
return value;
}
//显示栈的情况[遍历栈], 遍历时,需要从栈顶开始显示数据
public void list() {
if(isEmpty()) {
System.out.println("栈空,没有数据~~");
return;
}
//需要从栈顶开始显示数据
for(int i = top; i >= 0 ; i--) {
System.out.printf("stack[%d]=%d\n", i, stack[i]);
}
}
//访问栈顶元素
public void top() {
if(isEmpty()) {
System.out.println("栈空,没有数据~~");
return;
}
System.out.println(stack[top]);
}
标签:Java,实现,代码,System,stack,int,println,top,out
From: https://blog.csdn.net/2301_80484340/article/details/139264997