JAVA认证

question 29)

what is the result of the following operation?

system.out.println(4 | 3);

1) 6

2) 0

3) 1

4) 7

answer to question 29

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question 30)

public class myclass1 {

public static void main(string argv[]){ }

/*modifier at xx */ class myinner {}

}

what modifiers would be legal at xx in the above code?

1) public

2) private

3) static

4) friend

answer to question 30

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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

answer to question 31

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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();

answer to question 32

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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){

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