JAVA认证

question 56)

you are using the gridbaglayout manager to place a series of buttons on a frame. you want to make the size of one of the buttons bigger than the text it contains. which of the following will allow you to do that?

1) the gridbaglayout manager does not allow you to do this

2) the setfill method of the gridbaglayout class

3) the setfill method of the gridbagconstraints class

4) the fill field of the gridbagconstraints class

answer to question 56

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question 57)

which of the following most closely describes a bitset collection?

1) a class that contains groups of unique sequences of bits

2) a method for flipping individual bits in instance of a primitive type

3) an array of boolean primitives that indicate zeros or ones

4) a collection for storing bits as on-off information, like a vector of bits

answer to question 57

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question 58)

you have these files in the same directory. what will happen when you attempt to compile and run class1.java if you have not already compiled base.java

//base.java

package base;

class base{

protected void amethod(){

system.out.println('amethod');

}//end of amethod

}//end of class base

package class1;

//class1.java

public class class1 extends base{

public static void main(string argv[]){

base b = new base();

b.amethod();

}//end of main

}//end of class1

1) compile error: methods in base not found

2) compile error: unable to access protected method in base class

3) compilation followed by the output 'amethod'

4)compile error: superclass class1.base of class class1.class1 not found

answer to question 58

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question 59)

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

class base{

private void amethod(int ibase){

system.out.println('base.amethod');

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