分析下列程序，写出其功能。 import java.applet.*; import java.awt.*; import java.awt.event.*; public class Test extends Applet implements MouseListener { final int number = 5; int count = 0; Image[] card = new Image[number]; public void init() { setSize(1200,1000); addMouseListener(this); for (int i = 0; i < number; i++) { card[i] = getImage(getCodeBase(), i+".jpg"); } } public void paint(Graphics g) { if ((card[count]) != null) g.drawImage(card[count], 10,10,card[count].getWidth(this),card[count].getHeight(this), this); } public void mousePressed(MouseEvent e) { count = (count + 1) % number; repaint(); } public void mouseReleased(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mouseClicked(MouseEvent e) {} }
举一反三
- 写出下列程序的输出结果 public class Test { public static void main(String[] args) { Count myCount = new Count(); int times = 0; for(int i=0;i<100;i++) increment(myCount , times); System.out.println(“count is” + myCount.count); System.out.println(“time is”+ times); } public static void increment(Count c , int times) { c.count++; times++; } } class Count { public int count; Count(int c) { count =c; } Count() { count =1; } }
- class Count { public int count; public Count(int c) { count = c; } public Count() { count = 1; }}public class Test { public static void increment(Count c, int times) { c.count++; times++; } public static void main(String args[]) { Count myCount = new Count(); int times = 0; for (int i = 0; i A: myCount.count=4 times=0 B: myCount.count=3 times=0 C: myCount.count=4 times=1 D: myCount.count=3 times=1
- 阅读以下程序public class Count{static int count;int number;public Count(){count = count + 1;number = count;}}class Test{public static void Main(){Count a = new Count();Count b = new Count();Count c = new Count();}}程序运行后，对象a的count值是（） A: 0 B: 1 C: 2 D: 3
- 当鼠标进入应用程序的窗口时，所调用的鼠标事件的方法是（） A: public void mouseEntered( MouseEvent ) B: public void mousePressed( MouseEvent ) C: public void mouseMoved( MouseEvent ) D: public void mouseExited( MouseEvent )
- class Count {public int count;public Count（int c） {count = c;}public Count（）{count = 1;}}public class Test {public static void increment（Count c, int times） {c.count++;times++;}public static void main A: myCount.count=4 times=0 B: myCount.count=4 times=1 C: myCount.count=3 times=1 D: myCount.count=3 times=0