格林模拟试题一（下）(1)

 question 31) 
what will happen when you attempt to compile and run the following code? 
public class holt extends thread{    private string sthreadname;    public static void main(string argv){       holt h = new holt();       h.go();    }holt(){}holt(string s){    sthreadname = s;}public string getthreadname(){    return sthreadname;}public void go(){    holt first = new holt("first");    first.start();    holt second = new holt("second");    second.start();}    public void start(){       for(int i = 0; i < 2; i ++){           system.out.println(getthreadname() +i);       try{           thread.sleep(100);           } catch(interruptedexception e){system.out.println(e.getmessage());}       }    }} 
1) compile time error 
2) output of first0, second0, first0, second1 
3) output of first0, first1, second0, second1 
4) runtime error 
question 32) 
an applet has its layout manager set to the default of flowlayout. what code would be correct to change to another layout manager.  
1) setlayoutmanager(new gridlayout());  
2) setlayout(new gridlayout(2,2));  
3) setgridlayout(2,2); 
4) setborderlayout();  
question 33) 
what will happen when you attempt to compile and run the following code?.  
class background implements runnable{ int i=0;  public int run(){   while(true){   i++;   system.out.println("i="+i);   } //end while   return 1;  }//end run}//end class 
1) it will compile and the run method will print out the increasing value of i.  
2) it will compile and calling start will print out the increasing value of i.  
3) the code will cause an error at compile time.  
4) compilation will cause an error because while cannot take a parameter of true.