|NO.Z.00068|——————————|^^ 笔试 ^^|——|Java&集合类库.V04|——|Java.v04|异常机制.v04|finally使用|笔试考点|

一、finally的使用和笔试考点

package com.yanqi.task16;

public class ExceptionFinallyTest {

    // 笔试考点
    public static int test() {
        try {
            int[] arr = new int[5];
            System.out.println(arr[5]);
            return 0;
        } catch (ArrayIndexOutOfBoundsException e) {
            e.printStackTrace();
            return 1;
        } finally {
            return 2; // 提交结束方法并返回数据
        }
    }

    public static void main(String[] args) {

        try {
            int ia = 10;
            int ib = 0;
            System.out.println(ia / ib);
        } catch (ArithmeticException e) {
            e.printStackTrace();

            String str1 = null;
            //str1.length(); // 会发生空指针异常

        } finally {
            System.out.println("无论是否发生异常都记得来执行我哦！");  // 依然是执行
        }

        System.out.println("Over！"); // 不执行了

        System.out.println("----------------------------------------");
        int test = test();
        System.out.println("test = " + test); // 2
    }
}

二、编译打印

D:\JAVA\jdk-11.0.2\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=57553:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath E:\NO.Z.10000——javaproject\NO.H.00001.javase\javase\out\production\javase com.yanqi.task16.ExceptionFinallyTest
java.lang.ArithmeticException: / by zero
    at com.yanqi.task16.ExceptionFinallyTest.main(ExceptionFinallyTest.java:24)
java.lang.ArrayIndexOutOfBoundsException: Index 5 out of bounds for length 5
    at com.yanqi.task16.ExceptionFinallyTest.test(ExceptionFinallyTest.java:9)
    at com.yanqi.task16.ExceptionFinallyTest.main(ExceptionFinallyTest.java:38)
无论是否发生异常都记得来执行我哦！
Over！
----------------------------------------
test = 2

Process finished with exit code 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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