java英文(第八版)十二章答案

// Exercise12_2.java

public class Exercise12_2Temp {

public static void main(String[] args) {

new Exercise12_2Temp();

}

public Exercise12_2Temp() {

// Define the arrays to be tested.

Student[] students = new Student[3];

students[0] = new Student(new Name("Derek", 'S', "Dexony"));

students[1] = new Student(new Name("Stacy", 'M', "Waters"));

students[2] = new Student(new Name("Adamo", 'U', "Leetmz"));

String[] strings = {"Orange", "Jackblade", "Apple"};

Integer[] i = {new Integer(5), new Integer(0), new Integer(3)};

// Display current array of students

printList(students);

System.out.println();

// Display max of students

System.out.println("Max is " + max(students));

System.out.println();

// Display sorted students

sort(students);

printList(students);

System.out.println();

// Display current array of strings

printList(strings);

System.out.println();

// Display max of strings

System.out.println("Max is " + max(strings));

System.out.println();

// Display sorted strings

sort(strings);

printList(strings);

System.out.println();

// Display current array of intergers

printList(i);

System.out.println();

// Display max of ints

System.out.println("Max is " + max(i));

System.out.println();

// Display sorted ints

sort(i);

printList(i);

}

/** Pirnt an array of objects */

public static void printList(Object[] object) {

for (int i = 0; i < object.length; i++) {

System.out.println(object[i]);

}

} // End of method printList(Object[])

public static Comparable max(Comparable[] object) {

// Find max of array object

Comparable maxOfA = object[0];

for (int i = 1; i < object.length; i++) {

if (https://www.360docs.net/doc/143227135.html,pareTo(object[i]) == -1) {

maxOfA = object[i];

}

}

// Return results.

return maxOfA;

} // End of method max(Object[])

public static void sort(Comparable[] object) {

// Set the variables for the current min, minIndex, and compare value Comparable currentMin;

int currentMinIndex;

int compareInt;

// Begin loop to work through the list.

for (int i = 0; i < object.length; i++) {

// Find the minimum in the list.

currentMin = object[i];

currentMinIndex = i;

for (int k = i + 1; k < object.length; k++) {

compareInt = https://www.360docs.net/doc/143227135.html,pareTo(object[k]);

if (compareInt > 0) {

currentMin = object[k];

currentMinIndex = k;

}

}

// Swap list[i] with list[currentMaxIndex] if needed.

if (currentMinIndex != i) {

object[currentMinIndex] = object[i];

object[i] = currentMin;

}

}

} // End of instance method sort(Object[])

class Student extends Person implements Comparable, Cloneable { // Variables

private String major;

// Constructors

public Student(Name name) {

super(name);

major = "Computer Science";

}

// Default Constructor

public Student() {

}

// Instance Methods

public String getMajor() {

return major;

}

public void setMajor(String major) {

this.major = major;

}

public String toString() {

Name name = this.getName();

return name.getFullName() + '\n' + "Major: " + major;

}

public boolean equals(Object object) {

Name otherName = ((Student)object).getName();

if ((name.getFullName().equals(otherName.getLastName())) && (major.equals(((Student)object).getMajor()))) {

return true;

}

return false;

}

/** Compare studnet's major, then last name */

public int compareTo(Object object) {

if (https://www.360docs.net/doc/143227135.html,pareTo(((Student)object).major) == 0) {

return https://www.360docs.net/doc/143227135.html,pareTo(object);

}

else {

return https://www.360docs.net/doc/143227135.html,pareTo(((Student)object).major);

}

}

}

public class Person {

// Variables

private Name name;

// Constructors

public Person(Name name) {

https://www.360docs.net/doc/143227135.html, = name;

}

// Default Constructor

public Person() {

}

// Instance Methods

public Name getName() {

return name;

}

public void setName(Name name) {

https://www.360docs.net/doc/143227135.html, = name;

}

public String toString() {

}

public boolean equals(Object object) {

Name otherName = ((Person)object).getName();

if (name.getFullName().equals(otherName.getFullName())) {

return true;

}

return false;

}

/** Compare person's last name */

public int compareTo(Object object) {

Name name = this.getName();

String lastName = name.getLastName();

Name otherName = ((Student)object).getName();

String otherLastName = otherName.getLastName();

int i = 0;

if ((https://www.360docs.net/doc/143227135.html,pareTo(otherLastName)) > 0) {

i = 1;

}

else if ((https://www.360docs.net/doc/143227135.html,pareTo(otherLastName)) < 0) {

i = -1;

}

return i;

}

}

class Name {

// Variables

private String firstName;

private char mi;

private String lastName;

// Constructors

public Name(String firstName, char mi, String lastName) {

// Set new variables to instance.

this.firstName = firstName;

this.mi = mi;

https://www.360docs.net/doc/143227135.html,stName = lastName;

}

// Default Constructor

public Name() {

}

// Instance Methods

public String getFirstName() {

return firstName;

}

public void setFirstName(String firstName) {

this.firstName = firstName;

}

public char getMi() {

return mi;

}

public void setMi(char mi) {

this.mi = mi;

}

public String getLastName() {

return lastName;

}

public void setLastName(String lastName) {

https://www.360docs.net/doc/143227135.html,stName = lastName;

}

public String getFullName() {

return firstName + " " + mi + " " + lastName;

}

}

}

import java.awt.*;

import javax.swing.*;

public class Exercise12_4 extends JFrame {

public static void main(String[] args) {

Exercise12_4 frame = new Exercise12_4();

frame.pack();

frame.setTitle("Exercise12_4");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null); // Center the frame

frame.setVisible(true);

}

public Exercise12_4() {

// Create panel p1 add three buttons

JPanel p1 = new NewPanel("Button 1", "Button 2", "Button 3");

// Create Panel p2 and add three buttons

JPanel p2 = new NewPanel("Button 4", "Button 5", "Button 6");

// Create a frame with FlowLayout.

setLayout(new BorderLayout());

add(p1, BorderLayout.SOUTH);

add(p2, BorderLayout.CENTER);

}

}

class NewPanel extends JPanel {

public NewPanel(String s1, String s2, String s3) {

setLayout(new GridLayout(2, 2));

add(new JButton(s1));

add(new JButton(s2));

add(new JButton(s3));

}

}

import javax.swing.*;

import java.awt.*;

import javax.swing.border.*;

public class Exercise12_6 extends JFrame {

public Exercise12_6() {

JLabel jlbl1 = new JLabel(new ImageIcon("image/uk.gif"));

JLabel jlbl2 = new JLabel(new ImageIcon("image/fr.gif"));

JLabel jlbl3 = new JLabel(new ImageIcon("image/norway.gif"));

JLabel jlbl4 = new JLabel(new ImageIcon("image/my.jpg"));

jlbl1.setBorder(new LineBorder(Color.BLUE, 1));

jlbl2.setBorder(new LineBorder(Color.BLUE, 1));

jlbl3.setBorder(new LineBorder(Color.BLUE, 1));

jlbl4.setBorder(new LineBorder(Color.BLUE, 1));

setLayout(new GridLayout(2, 2));

add(jlbl1);

add(jlbl2);

add(jlbl3);

add(jlbl4);

}

public static void main(String[] args) {

Exercise12_6 frame = new Exercise12_6();

frame.setTitle("Exercise12_6");

frame.pack();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null); // Center the frame

frame.setVisible(true);

}

}

import java.awt.*;

import javax.swing.*;

import javax.swing.border.*;

public class Exercise12_8 extends JFrame {

private JLabel jlblBlack = new JLabel("black");

private JLabel jlblBlue = new JLabel("blue");

private JLabel jlblCyan = new JLabel("cyan");

private JLabel jlblGreen = new JLabel("green");

private JLabel jlblMagenta = new JLabel("magenta"); private JLabel jlblOrange = new JLabel("orange");

public Exercise12_8() {

setLayout(new GridLayout(2, 3));

this.add(jlblBlack);

this.add(jlblBlue);

this.add(jlblCyan);

this.add(jlblGreen);

this.add(jlblMagenta);

this.add(jlblOrange);

jlblBlack.setBackground(Color.WHITE);

jlblBlue.setBackground(Color.WHITE);

jlblCyan.setBackground(Color.WHITE);

jlblGreen.setBackground(Color.WHITE);

jlblMagenta.setBackground(Color.WHITE); jlblOrange.setBackground(Color.WHITE);

jlblBlack.setForeground(Color.BLACK);

jlblBlue.setForeground(Color.BLUE);

jlblCyan.setForeground(Color.CYAN);

jlblGreen.setForeground(Color.GREEN);

jlblMagenta.setForeground(Color.MAGENTA); jlblOrange.setForeground(Color.ORANGE);

Font font = new Font("TImesRoman", Font.BOLD, 20); jlblBlack.setFont(font);

jlblBlue.setFont(font);

jlblCyan.setFont(font);

jlblGreen.setFont(font);

jlblMagenta.setFont(font);

jlblOrange.setFont(font);

Border border = new LineBorder(Color.YELLOW); jlblBlack.setBorder(border);

jlblBlue.setBorder(border);

jlblCyan.setBorder(border);

jlblGreen.setBorder(border);

jlblMagenta.setBorder(border);

jlblOrange.setBorder(border);

jlblBlack.setToolTipText("black");

jlblBlue.setToolTipText("blue");

jlblCyan.setToolTipText("cyan");

jlblGreen.setToolTipText("green");

jlblMagenta.setToolTipText("magenta");

jlblOrange.setToolTipText("orange");

}

public static void main(String[] args) {

Exercise12_8 frame = new Exercise12_8();

frame.setTitle("Exercise12_8");

frame.setSize(400, 400);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); // Center the frame frame.setVisible(true);

}

}

import java.awt.*;

import javax.swing.*;

public class Exercise12_10 extends JFrame {

public static void main(String[] args) {

Exercise12_10 frame = new Exercise12_10();

frame.setSize(200, 200);

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setTitle("Exercise12_10");

frame.setVisible(true);

}

public Exercise12_10() {

// Create panel p1 add three buttons

JPanel p1 = new JPanel(new GridLayout(8, 8));

add(p1);

JButton[][] buttons = new JButton[8][8];

boolean isWhite = true;

for (int i = 0; i < 8; i++) {

for (int j = 0; j < 8; j++) {

buttons[i][j] = new JButton();

p1.add(buttons[i][j]);

if (isWhite) {

buttons[i][j].setBackground(Color.WHITE);

isWhite = false;

}

else {

buttons[i][j].setBackground(Color.BLACK);

isWhite = true;

}

}

if (i % 2 == 0)

isWhite = false;

else

isWhite = true;

} } }