10.异常

package com.demo1108;

import java.util.InputMismatchException;
import java.util.Scanner;

/**
 * 异常的案例
 */
public class ExcptionDemo {
	public static void main(String[] args) {
		try{
			Scanner sc = new Scanner(System.in);
			System.out.println("请输入第一个数");
			int num1 = sc.nextInt();
			System.out.println("请输入第二个数");
			int num2 = sc.nextInt();
			int num3 = num1/num2;
			System.out.println(num3);
		}catch (InputMismatchException e) {
			//处理方法。B计划
			System.out.println("A计划失败，执行B");
			e.printStackTrace();
		}catch (ArithmeticException e) {
			System.out.println("A计划失败，执行C");
			e.printStackTrace();
		}catch (Exception e) {
			System.out.println("所有计划都失败，执行自毁程序");
			e.printStackTrace();
		}finally{
			System.out.println("我是终将被执行的代码");
		}
		System.out.println("程序正常结束");
	}
}

package com.demo1108;

import java.util.Scanner;

public class MyselfException {
	public static void main(String[] args) {
		Student stu = new Student();
		Scanner sc = new Scanner(System.in);
		while(true){
			System.out.println("请输入性别:");
			try {
				stu.setSex(sc.next());
			} catch (SexException e) {
				System.out.println("输入有误，请重新输入。");
//				e.printStackTrace();
				continue;
			}
			break;
		}
	}
}

class Student{
	private String sex;

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) throws SexException {
		if("男".equals(sex)||"女".equals(sex)){
			this.sex = sex;
		}else{
			throw new SexException();
		}
	}
}

class SexException extends Exception{
	public String getMessage() {
		return "性别只能输入‘男‘或者‘女‘";
	}
}

package com.demo1108;

public class ThrowDemo {
	public static void main(String[] args) {
		Teacher t = new Teacher();
		try {
			t.teach();
			System.out.println("你是最棒的");
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("执行B计划");
		} finally {
			System.out.println("我是谁？");
		}
		System.out.println("程序正常结束");
	}
}
class Teacher{
	public void teach() throws NullPointerException,Exception{
		String weather="高温";
		if("冰冻".equals(weather)){
			throw new Exception("冰冻三尺");
		}
		if("高温".equals(weather)){
			throw new MyException();
		}
		System.out.println("正常上课");
	}
}

class MyException extends Exception{
	@Override
	public String getMessage() {
		return "这是一个自定义异常";
	}
}