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  • Java之常见异常

    package com.atguigu.java1;

    import java.io.File;
    import java.io.FileInputStream;
    import java.util.Date;
    import java.util.Scanner;

    import org.junit.Test;

    /*
    * 一、异常体系结构
    *
    * java.lang.Throwable
    * |-----java.lang.Error:一般不编写针对性的代码进行处理。
    * |-----java.lang.Exception:可以进行异常的处理
    * |------编译时异常(checked)
    * |-----IOException
    * |-----FileNotFoundException
    * |-----ClassNotFoundException
    * |------运行时异常(unchecked,RuntimeException)
    * |-----NullPointerException
    * |-----ArrayIndexOutOfBoundsException
    * |-----ClassCastException
    * |-----NumberFormatException
    * |-----InputMismatchException
    * |-----ArithmeticException
    *
    *
    *
    * 面试题:常见的异常都有哪些?举例说明
    */
    public class ExceptionTest {

    //******************以下是编译时异常***************************
    @Test
    public void test7(){
    // File file = new File("hello.txt");
    // FileInputStream fis = new FileInputStream(file);
    //
    // int data = fis.read();
    // while(data != -1){
    // System.out.print((char)data);
    // data = fis.read();
    // }
    //
    // fis.close();

    }

    //******************以下是运行时异常***************************
    //ArithmeticException
    @Test
    public void test6(){
    int a = 10;
    int b = 0;
    System.out.println(a / b);
    }

    //InputMismatchException
    @Test
    public void test5(){
    Scanner scanner = new Scanner(System.in);
    int score = scanner.nextInt();
    System.out.println(score);

    scanner.close();
    }

    //NumberFormatException
    @Test
    public void test4(){

    String str = "123";
    str = "abc";
    int num = Integer.parseInt(str);



    }

    //ClassCastException
    @Test
    public void test3(){
    Object obj = new Date();
    String str = (String)obj;
    }

    //IndexOutOfBoundsException
    @Test
    public void test2(){
    //ArrayIndexOutOfBoundsException
    // int[] arr = new int[10];
    // System.out.println(arr[10]);
    //StringIndexOutOfBoundsException
    String str = "abc";
    System.out.println(str.charAt(3));
    }

    //NullPointerException
    @Test
    public void test1(){

    // int[] arr = null;
    // System.out.println(arr[3]);

    String str = "abc";
    str = null;
    System.out.println(str.charAt(0));

    }


    }
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  • 原文地址:https://www.cnblogs.com/wpy188/p/12088921.html
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