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发布时间：2006-06-28 10:51     点击：

47. Given this skeleton of a class currently under construction:

public class Example{

int x,y,z;

public Example (int a, int b) {

//lots of complex computation

x=a; y=b;

}

public Example(int a, int b, int c){

// do everything the same as single argument

// version of constructor

// including assignment x=a, y=b, z=c

z=c;

}

}

What is the most concise way to code the “do everything…” part of the constructor taking two arguments?

Short answer:

48. Which correctly create a two dimensional array of integers?

A. int a[][] = new int[][];

B. int a[10][10] = new int[][];

C. int a[][] = new int[10][10];

D. int [][]a = new int[10][10];

E. int []a[] = new int[10][10];

49. Which are correct class declarations? Assume in each case that the text constitutes the entire contents of a file called Fred.java?

A. public class Fred{

public int x = 0;

public Fred (int x){

this.x=x;

}

}

B. public class fred{

public int x = 0;

public Fred (int x){

this.x=x;

}

}

C. public class Fred extends MyBaseClass, MyOtherBaseClass{

public int x = 0;

public Fred(int xval){

x=xval;

}

}

D. protected class Fred{

private int x = 0;

private Fred (int xval){

x=xval;

}

}

E. import java.awt.*;

public class Fred extends Object{

int x;

private Fred(int xval){

x = xval;

}

}

50. A class design requires that a particular member variable must be accessible for direct access by any subclasses of this class. but otherwise not by classes which are not members of the same package. What should be done to achieve this?

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