/* 除法运算: java Div 6 2 -> 6/2=3*/

public class Div {

public static void main(String args[]) {

int m, n, r;

m=n=r=0; //初始化

try {

m = Integer.parseInt(args[0]);

n = Integer.parseInt(args[1]);

r = div(m, n);

craetException();

} catch (NumberFormatException exception1) { //自己处理:数字格式异常(java Div 6 a)

System.out.println("====An exception occurs1:"+exception1+"=====");

} catch (ArithmeticException exception2) { //处理扔过来的异常:除零错误异常(java Div 6 0)

System.out.println("====An exception occurs2:"+exception2+"=====");

} catch (RuntimeException runtimeexception) { //处理所有不可查异常,比如位数不够(java Div 6)

System.out.println("====An exception occurs:"+runtimeexception+"=====");

} catch (Exception exception) { //处理自己通过throw创建的可查异常

System.out.println("====An exception occurs:"+exception+"=====");

}

finally {

//无论是否发生异常,finally代码块中的代码总会被执行,完成清理类型等收尾善后性质的功能

System.out.println("finally"); //finally中不要包含return

}

System.out.println(m+"/"+n+"="+r);

}

//扔给调用者处理:除零错误异常(java Div 6 0)

//public static int div(int m, int n) throws ArithmeticException {

public static int div(int m, int n) { //ArithmeticException是不可查异常,出现后会自动抛出,可以不要throws

int r;

r = m / n;

return r;

}

//自己创建的可查异常NullPointerException,必须处理,这里将其抛出,因此必须要throws

public static void craetException() throws Exception {

throw new Exception("My Craeted Exception");

}

}