JAVA教程期末复习答案.docVIP

Question 1 Question 2 1 () after String 2 == after rand 3 ; after if 4 glass 5 missing { after main Question 3 10.0 55.0 55.0 10.0 -3 -4 Question 4 Question 5 import java.awt.*; import java.applet.*; import java.awt.event.*; public class question07 extends Applet implements ActionListener, MouseListener{ private final int SIZE = 25; /** WIDTH and HEIGHT of the square */ private final int START_X = 40; /** initial x position of the square */ private final int START_Y = 50; /** initial y position of the square */ /** set up the TextFields, Button */ public void init() { } /** display the square in its current position */ public void paint( Graphics g ) { } /** called when the RESET button is clicked */ public void actionPerformed(ActionEvent e) { } /** called when one of the buttons is pressed */ public void mousePressed(MouseEvent e) { } /** these methods are not used */ public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mouseClicked(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} } Question 6 Question 7 public class Car { private String type; private int speed; public Car(String type, int speed) { this.type = type; this.speed = speed; } public void changeSpeed(int diff) { speed += diff; } public String getName() { return type; } public boolean sameSpeedAs(Car other) { return other.speed == speed; } public String toString() { if (speed == 0) return type + not moving; else return type + moving at + speed + km/h; } } Question 8 (1)1 3 3 4 (2)false true (3)B,c,d,e Question 9 /** current x, y of the square */ private int squareX, squareY; /** reset Button */ private Button resetB; /** boolean to store whether square area is cleared */ private boolean isSelected; isSelected = false; squareX = START_X; squareY = START_Y; addMouseListener(this); resetB = new Button(RESET); resetB.addActionListener(this); add(resetB); if (isSelected) g.setColor(Color.red); else g.setColor(Color.cyan); g.fillRe