finally执行语句的注意和小陷阱

public class FinallyTest {
    public static void main(String[] args) {
            int res=div(10,0);
        System.out.println(res);
    }
    public static int div(int a,int b){
        int num=0;
        try {
            num=a/b;
        }catch (ArithmeticException e){
            System.out.println("算数异常");
        }catch (NumberFormatException e){
            e.printStackTrace();
        }catch (Exception e){
            System.out.println("其他异常");
        }finally {
            System.out.println("一定执行的语句");
        }
        return num;
    }
}
 

public class FinallyTest {
    public static void main(String[] args) {
            int res=div(10,0);
        System.out.println(res);
    }
    public static int div(int a,int b){
        int num=0;
        try {
            num=a/b;
        }catch (ArithmeticException e){
            System.out.println("算数异常");
            return 11;
        }catch (NumberFormatException e){
            e.printStackTrace();
        }catch (Exception e){
            System.out.println("其他异常");
        }finally {
            System.out.println("一定执行的语句");
        }
        return num;
    }
}
 

 

结论：

finally 是可选的，一旦写上就一定执行的语句,即使过程中有return也一定执行

/*
finally 是可选的，一旦写上就一定执行的语句,即使过程中有return也一定执行
 */
public class FinallyTest {
    public static void main(String[] args) {
            int res=div(10,0);
        System.out.println(res);
    }
    public static int div(int a,int b){
        int num=0;
        try {
            num=a/b;
        }catch (ArithmeticException e){
            System.out.println("算数异常");
            return 11;
        }catch (NumberFormatException e){
            e.printStackTrace();
        }catch (Exception e){
            System.out.println("其他异常");
        }finally {
            System.out.println("一定执行的语句");
            return 22;
        }
    }
}
 

 

/*
finally 是可选的，一旦写上就一定执行的语句,即使过程中有return也一定执行
 */
public class FinallyTest {
    public static void main(String[] args) {
            int res=div(10,0);
        System.out.println(res);
    }
    public static int div(int a,int b){
        int num=0;
        try {
            num=a/b;
        }catch (ArithmeticException e){
            System.out.println("算数异常");
            return num;
        }catch (NumberFormatException e){
            e.printStackTrace();
        }catch (Exception e){
            System.out.println("其他异常");
        }finally {
            num+=100;
            System.out.println("一定执行的语句");
        }
        return num;
    }
}
 

/*
finally 是可选的，一旦写上就一定执行的语句,即使过程中有return也一定执行
 */
public class FinallyTest {
    public static void main(String[] args) {
            int res=div(10,0);
        System.out.println(res);
    }
    public static int div(int a,int b){
        int num=0;
        try {
            num=a/b;
        }catch (ArithmeticException e){
            System.out.println("算数异常");
            return num;
        }catch (NumberFormatException e){
            e.printStackTrace();
        }catch (Exception e){
            System.out.println("其他异常");
        }finally {
            num+=100;
            System.out.println("一定执行的语句");
            return num;
        }
    }
}