java異常練習題

package demo;

public class demo9 {

public static void func() throws Exception

{
    try
    {
        throw  new Exception();
    }
    finally
    {
        System.out.println("B");
    }                                                                                                                               
}

public static void main(String[] args)

{
    try
    {
        func();
        System.out.println("A");
    }
    catch(Exception e)      //Exception e=new Exception;
    {
        System.out.println("C");
    }
    System.out.println("D");
}

}

//BCD

---

class Demo
{

public static void main(String[] args)
{
    try
    {       showExce();//可能發生異常
        System.out.println("A");
    }
    catch(Exception e)
    {
        System.out.println("B");
    }
    finally
    {
        System.out.println("C");
    }
    System.out.println("D");
}

public static void showExce()throws Exception
{
    throw new Exception();
}

}
//BCD

---

class Test
{
public static String output=”“;
public static void foo(int i)
{
try
{
if(i==1)
throw new Exception();
output+=”1”;
}
catch(Exception e)
{
output+=”2”;
return;
}
finally
{
output+=”3”;
}
output+=”4”;
}
public static void main(String args[])
{
foo(0);
System.out.println(output);
foo(1);
System.out.println(output);
}
}
//134
//13423

---

class Demo
{

public static void func()
{
    try
    {
        throw  new Exception();//一定發生了異常
        System.out.println("A");------異常已經捕捉到，後面就不能接任何語句
    }
    catch(Exception e)
    {
        System.out.println("B");
    }
}
public static void main(String[] args)
{
    try
    {
        func();
    }
    catch(Exception e)
    {
        System.out.println("C");
    }
    System.out.println("D");
}

}
//BD

---

package demo;

class TD
{
int y=6;
class Inner
{
int y=3;

    void show()
    {
        System.out.println(y);
    }
}

}
public class demo9
{

public package demo;

class TD
{
int y=6;
class Inner
{
int y=3;

    void show()
    {
        System.out.println(y);
    }
}

}
public class demo9
{

public static void main(String[] args)

{
    TD.Inner ti=new TD().new Inner();
    ti.show();
    System.out.println(ti.y);
}

}
//3 3

---