JAVA题库:格林模拟试题二(上)

Question 17)

Which statements are correct about the anchor field?

1) It is a field of the GridBagLayout manager for controlling component placement

2) It is a field of the GridBagConstraints class for controlling component placement

3) A valid setting for the anchor field is GridBagConstraints.NORTH

4) The anchor field controls the height of components added to a container

Question 18)

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

public class Bground extends Thread{


public static void main(String argv[]){


                Bground b = new Bground();


                b.run();


        }


        public void start(){


                for (int i = 0; i <10; i++){


                        System.out.println("Value of i = " + i);


                }


        }


}

1) A compile time error indicating that no run method is defined for the Thread class

2) A run time error indicating that no run method is defined for the Thread class

3) Clean compile and at run time the values 0 to 9 are printed out

4) Clean compile but no output at runtime

Question 19)

Is the following statement true or false?

When using the GridBagLayout manager, each new component requires a new instance of the GridBagConstraints class.