异常处理：finally块中代码什么时候执行总结！

前言

由于总是搞不清楚try/catch中的一个执行顺序，返回结果。所以总结一下

1.finally没有return 时，可以看出finally确实在return之前执行了

public static void main(String[] args) {
      int aa = test1();
    System.out.println(aa);
    }


    public  static int  test1(){
        try{
            System.out.println("try");
            return 0;
        }catch(Exception e){
            System.out.println("catch");
            return 1;
        }finally {
            System.out.println("finally");

        }
    }

    //结果
     //try
    //finally
    //0

2. finally有return 时，会覆盖其他语句中的return

public static void main(String[] args) {
      int aa = test1();
    System.out.println(aa);
    }


    public  static int  test1(){
       try{
            System.out.println("try");
            return 0;
        }catch(Exception e){
            System.out.println("catch");
            return 1;
        }finally {
            System.out.println("finally");
           return 2;
        }
    }

    //结果
      //try
    //finally
    //2

3.finally中对基本数据类型没有影响

 public  static int  test1(){
        int result = 6;
        try{
            System.out.println("try");
            return result;
        }catch(Exception e){
            System.out.println("catch");
            return 1;
        }finally {
            System.out.println("finally");
            result = 3;
        }
    }

    //结果try
    //finally
    //6

4.finally中对引用型数据有影响

public  static StringBuffer  test1(){
       StringBuffer str = new StringBuffer("I");
        try{
            System.out.println("try");
            return str;
        }catch(Exception e){
            System.out.println("catch");
            return null;
        }finally {
            System.out.println("finally");
            str.append("am");
        }
    }

    //结果try
    //finally
    // I am

5.当try/catch外面有异常，finally不执行

 public  static int  test2(){
        int a = 5/0;
        try{
            System.out.println("try");
            return a;
        }catch(Exception e){
            System.out.println("catch");
            return 2;
        }finally {
            System.out.println("finally");
        }
    }

Exception in thread "main" java.lang.ArithmeticException: / by zero
    at com.jxl.face.Controller.EnumTest.test2(EnumTest.java:29)
    at com.jxl.face.Controller.EnumTest.main(EnumTest.java:19)

6.异常在try/catch里面，finally无return

public  static int  test2(){

        try{
            int a = 5/0;
            System.out.println("try");
            return a;
        }catch(Exception e){
            System.out.println("catch");
            return 2;
        }finally {
            System.out.println("finally");
        }
    }

    //catch
    //finally
    //2

7.异常在try/catch里面，finally有return

public  static int  test2(){

        try{
            int a = 5/0;
            System.out.println("try");
            return a;
        }catch(Exception e){
            System.out.println("catch");
            return 2;
        }finally {
            System.out.println("finally");
            return 3；
        }
    }

    //catch
    //finally
    //3