1、异常详细描述

Test ignored.

org.junit.platform.commons.PreconditionViolationException: Class [org.bc.offer.datastructure.Stack] must declare a single constructor

Process finished with exit code -1

2、源码

package org.bc.offer.datastructure;

import org.junit.jupiter.api.Test;

/**
 *
 * @description:
 * @author:bc
 * @date: 2023/06/29
 *
 * 基于数组实现的顺序栈
 *
 **/
public class Stack<E> {
    private Object [] data=null;
    private int maxSize=0;//栈的大小
    private int top=-1;//栈顶的指针
    public Stack(){
        this(10);
    }
    public Stack(int initialSize){
        if(initialSize>=0){
            this.maxSize=initialSize;
            data=new Object[initialSize];
            top=-1;
        }else{
            throw new RuntimeException("初始化大小不能小于0："+initialSize);
        }

    }
    public boolean push(E e){
        if(top==maxSize-1){
            throw new RuntimeException("栈已满，无法将元素入栈");
        }else{
            data[++top]=e;
        }
        return true;
    }

    public E pop(){
        if(top==-1){
            throw new RuntimeException("栈为空");
        }else{
            return (E) data[top--];
        }
    }
    public E peek(){
        if(top==-1){
            throw new RuntimeException("栈为空");
        }else{
            return (E) data[top];
        }

    }
    @Test
  public void testStack(){
        Stack stack=new Stack(10);
        stack.push(2);
        stack.push(1);
        stack.push(5);
        stack.push(6);
        for(int i=0;i<10;i++) {
            System.out.println(stack.pop() + "");
        }
  }

}

3、修改后源码：

package org.bc.offer.datastructure;

import org.junit.jupiter.api.Test;

/**
 *
 * @description:
 * @author:bc
 * @date: 2023/06/29
 *
 * 基于数组实现的顺序栈
 *
 **/
public class Stack<E> {
    private Object [] data=null;
    private int maxSize=0;//栈的大小
    private int top=-1;//栈顶的指针

    public Stack(){
        int initialSize=10;
        if(initialSize>=0){
            this.maxSize=initialSize;
            data=new Object[initialSize];
            top=-1;
        }else{
            throw new RuntimeException("初始化大小不能小于0："+initialSize);
        }

    }
    public boolean push(E e){
        if(top==maxSize-1){
            throw new RuntimeException("栈已满，无法将元素入栈");
        }else{
            data[++top]=e;
        }
        return true;
    }

    public E pop(){
        if(top==-1){
            throw new RuntimeException("栈为空");
        }else{
            return (E) data[top--];
        }
    }
    public E peek(){
        if(top==-1){
            throw new RuntimeException("栈为空");
        }else{
            return (E) data[top];
        }

    }
    @Test
  public void testStack(){
        Stack stack=new Stack();
        stack.push(2);
        stack.push(1);
        stack.push(5);
        stack.push(6);
        for(int i=0;i<10;i++) {
            System.out.println(stack.pop() + "");
        }
  }

}

4、解释
org.junit.jupiter.api.Test
这个单元测试框架，不允许@Test 标注的方法所在的类存在有参构造器，一旦存在，便报一下异常另外，该测试框架也不允许有多个构造器，如果存在多个构造器，则报一下错误
must declare a single constructor