格林模拟试题二(上)(8)

 question 27)

which of the following is the correct syntax for suggesting that the jvm performs garbage collection

1) system.free();
3) system.out.gc();
question 28)

public class as{
int j;
boolean b;
as a = new as();
}
system.out.println(j);
}

1) compilation succeeds and at run time an output of 0 and false
3) compile time error b is not initialised
||| question 29)

public class arg{
public static void main(string argv){
}

public void amethod(){
}

1) compile time error
3) compilation and output of "there"
question 30)

what will happen when you attempt to compile and run the following code

public class streq{
streq s = new streq();
private streq(){
string s2 = new string("marcus");
system.out.println("we have a match");
system.out.println("not equal");
}

1) compile time error caused by private constructor
3) output of "not equal"