Java培训总结笔记（三）

throw new ArrayIndexOutOfBoundsException();
//手动抛出;JVM运行时帮你抛出

public class Launcher {
public static void main(String[] args){
m1();
}
public static void m1(){
m2();
}
public static void m2(){
int[] arr = new int[2];
arr[2] =1;
}
}
/*Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at Launcher.m2(Launcher.java:13)
at Launcher.m1(Launcher.java:9)
at Launcher.main(Launcher.java:6)
*/

public class Launcher {
public static void main(String[] args){
try{
m1();
}catch(ArrayIndexOutOfBoundsException e){
e.printStackTrace();
}catch(Exception e){
e.printStackTrace();
}finally{
System.out.println("finally");
}
}
public static void m1(){
m2();
}
public static void m2(){
int[] arr = new int[2];
arr[2] =1;
}
}
//catch可以有多个，顺序从小到大

public class MyException extends Exception //继承自Exception
{
public MyException(){
super();
}
public MyException(String msg){
super(msg);
}
}
public static void main(String[] args)t
4000
hrows MyException{
throw new MyException("出现异常了");
//throw new NullPointerException();
}