public class ExceptionDemo {

 public static void main(String[] args) {
 //OutOfMemoryError內(nèi)存溢出錯誤，
 int[] i = new int[1024*1024*1024];
 System.out.println(i[1]);
 
 //ArrayIndexOutOfBoundsException索引越界異常
 int[] s = new int[2];
 System.out.println(s[2]);
 
 
 Calc calc = new Calc(); 
 //假如我們在這里捕獲異常
 try {
  calc.run(4, 0);
  calc.run(4, -1);
 } catch (NegativeException e) {//必須先拋出異常的自定義子類
  e.printStackTrace();
  System.out.println(e.getMessage());
  //throw e;//可以繼續(xù)將此異常拋出
 } catch (ArithmeticException e){//拋出自定義異常類的父類
  e.printStackTrace();
  System.out.println(e.getMessage());
  //throw e;
 } finally {
  System.out.println("finally肯定會執(zhí)行到");
 }
 //如果上面進行了異常捕獲，那么代碼可以繼續(xù)執(zhí)行，否者代碼不能繼續(xù)執(zhí)行
 System.out.println("可以執(zhí)行到！");
 
 try {
  calc.run(4, -1);
  
 } catch (NegativeException e) {
  e.printStackTrace();
  System.out.println(e.getMessage());
  return;
 } finally {
  System.out.println("肯定會執(zhí)行的");
 }
 System.out.println("執(zhí)行不到了");//執(zhí)行不到此行代碼
 
 }

}

/**
 * 自定義異常
 */
class NegativeException extends ArithmeticException{
 public NegativeException() {
 }
 public NegativeException(String msg) {
 super(msg);
 }
}

interface AA{
 public abstract void method();
}

class Calc implements AA{
 //ArithmeticException其實為運行時異常(RuntimeException)，即使不進行throws聲明，也可以通過編譯
 public int run(int m,int n)throws ArithmeticException,NegativeException{
 if(n==0){
  throw new ArithmeticException("除數(shù)不能為0");
 }else if(n<0){
  throw new NegativeException("除數(shù)不能為負數(shù)");
 }
 int s = m/n;
 return s ;
 }

 @Override
 public void method() {
 try {
  int p = 4/0;
 } catch (ArithmeticException e) {
  e.printStackTrace();
  throw new RuntimeException();//將異常繼續(xù)拋出為運行時異常
 }
 }
}