Java如何自定义异常类和自定义异常类的简单使用

package com.cdzyjsxy.javase.exception;

import com.sun.org.apache.xpath.internal.SourceTree;
import com.sun.org.apache.xpath.internal.objects.XObject;
import com.sun.xml.internal.ws.addressing.WsaActionUtil;

/**
 * @author FL
 * @date 2020/6/17
 **/
public class MyStack {

    private Object [] elements;
    private int index;

    public MyStack(){
        this.elements = new Object[10];
        this.index = -1;
    }
    /**
     * 亚栈方法
        * @param object
        * @return void
        * @author FanLin
        * @date 2020/6/17 9:44
    */
    public void push(Object object) throws MyStackOperationException {
        if (index>=elements.length-1){
//            System.out.println("占已满，亚栈失败");
//            return;
       //创建异常对象
       //     MyStackOperationException e = new MyStackOperationException("栈已满，压栈失败");
       //手动抛出异常
       //     throw e;
       //合并上述两行代码
            throw new MyStackOperationException("栈已满，压栈失败");
        }
        index++;
        elements[index] = object;
        System.out.println("亚栈"+object+"元素成功，栈针指向"+index);
    }
    /**
     * 弹栈方法
        * @param
        * @return void
        * @author FanLin
        * @date 2020/6/17 9:50
    */
    public void pop() throws MyStackOperationException {
        if (index<0){
//            System.out.println("弹栈失败，栈已空");
//            return;
//           创建异常对象
//         MyStackOperationException e =   new MyStackOperationException("弹栈失败，栈已空");
//           手动抛出异常
//         throw e;
     //合并上述两行代码
            throw new MyStackOperationException("弹栈失败，栈已空");

        }
        System.out.println("弹栈"+elements[index]+"元素成功");
        index--;
        System.out.println("栈针指向"+index);
    }

    public Object[] getElements() {
        return elements;
    }

    public void setElements(Object[] elements) {
        this.elements = elements;
    }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }
}

---

package com.cdzyjsxy.javase.exception;

/**
 * @author FL
 * @date 2020/6/17
 **/
//栈操作异常:自定义异常
public class MyStackOperationException extends Exception {
    public MyStackOperationException() {
        super();
    }

    public MyStackOperationException(String message) {
        super(message);
    }
}

---

package com.cdzyjsxy.javase.exception;

/**
 * @author FL
 * @date 2020/6/17
 **/
//测试改过后的程序
public class Exception05 {
    public static void main(String[] args) {
       //创建对象
        MyStack myStack = new MyStack();
        //压栈
        try {
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            myStack.push(new Object());
            //压栈失败
            myStack.push(new Object());
            myStack.push(new Object());

        } catch (MyStackOperationException e) {
            e.printStackTrace();
            System.out.println("shibai");
        }
        //弹栈
        try {
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            myStack.pop();
            //此处就应该弹栈失败
            myStack.pop();

        } catch (MyStackOperationException e) {
            e.printStackTrace();
            System.out.println("shibai");
        }
    }
}