Java implements simple stack code

The example of this article shares the specific code for implementing a simple stack in Java for your reference. The specific content is as follows

/**
 * Created by Frank
 */
public class ToyStack {
  /**
   * 栈的最大深度
   **/
  protected int MAX_DEPTH = 10;
 
  /**
   * 栈的当前深度
   */
  protected int depth = 0;
 
  /**
   * 实际的栈
   */
  protected int[] stack = new int[MAX_DEPTH];
 
  /**
   * push，向栈中添加一个元素
   *
   * @param n 待添加的整数
   */
  protected void push(int n) {
    if (depth == MAX_DEPTH - 1) {
      throw new RuntimeException("栈已满，无法再添加元素。");
    }
    stack[depth++] = n;
  }
 
  /**
   * pop，返回栈顶元素并从栈中删除
   *
   * @return 栈顶元素
   */
  protected int pop() {
    if (depth == 0) {
      throw new RuntimeException("栈中元素已经被取完，无法再取。");
    }
 
    // --depth，dept先减去1再赋值给变量dept，这样整个栈的深度就减1了（相当于从栈中删除）。
    return stack[--depth];
  }
 
  /**
   * peek，返回栈顶元素但不从栈中删除
   *
   * @return
   */
  protected int peek() {
    if (depth == 0) {
      throw new RuntimeException("栈中元素已经被取完，无法再取。");
    }
    return stack[depth - 1];
  }
}

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