public class exam {

     static int num=5;

     static int m1(){

         try{

             num=6;

             throw new NullPointerException();

             System.out.println("111");　　　　//编译不通过

         }catch(ArrayIndexOutOfBoundsException e){

             num=10;

             System.out.println("222");

         }catch(Exception e){

             num+=1;

             System.out.println("333");

             return num;

         }finally{

             num=10;

             System.out.println("444");

             throw new NullPointerException();

         }

     }

     public static void main(String[] args) {

         try{

             m1();

             num=20;

         }catch(Exception e){

             num+=1;

             System.out.println("555");

         }

         System.out.println(exam.num);

     }

 }

输出结果：

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Unreachable code

at exam.m1(exam.java:8)
at exam.main(exam.java:25)

1. public void XXX() throws Throwable{
2. throw new Throwable();
3. System.out.println("test");
4. }

1. public void XXX() {
2. return;
3. System.out.println("test");
4. }

1. public void XXX() {
2. for(int i=0; i<10; i++) {
3. continue;
4. System.out.println("test");
5. }
6. }

1. public void XXX() {
2. for(int i=0; i<10; i++) {
3. if(i==5) {
4. break;
5. System.out.println("test");
6. }
7. }
8. }

1. public static void XXX() {
2. while(true);
3. System.out.println("when?");
4. }