Java新手,问个土问题,100分! 可以implements两种啊,但一般是把要实现的监听对象作成两个类,在去引用它 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 import java.awt.event.*;import java.util.*;public class myKeyMouse implements KeyListener, MouseListener{ private transient Vector keyListeners; private transient Vector mouseListeners; public synchronized void removeKeyListener(KeyListener l) { if (keyListeners != null && keyListeners.contains(l)) { Vector v = (Vector) keyListeners.clone(); v.removeElement(l); keyListeners = v; } } public synchronized void addKeyListener(KeyListener l) { Vector v = keyListeners == null ? new Vector(2) : (Vector) keyListeners.clone(); if (!v.contains(l)) { v.addElement(l); keyListeners = v; } } protected void fireKeyTyped(KeyEvent e) { if (keyListeners != null) { Vector listeners = keyListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((KeyListener) listeners.elementAt(i)).keyTyped(e); } } } protected void fireKeyPressed(KeyEvent e) { if (keyListeners != null) { Vector listeners = keyListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((KeyListener) listeners.elementAt(i)).keyPressed(e); } } } protected void fireKeyReleased(KeyEvent e) { if (keyListeners != null) { Vector listeners = keyListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((KeyListener) listeners.elementAt(i)).keyReleased(e); } } } public void keyTyped(KeyEvent e) { } public void keyPressed(KeyEvent e) { } public void keyReleased(KeyEvent e) { } public synchronized void removeMouseListener(MouseListener l) { if (mouseListeners != null && mouseListeners.contains(l)) { Vector v = (Vector) mouseListeners.clone(); v.removeElement(l); mouseListeners = v; } } public synchronized void addMouseListener(MouseListener l) { Vector v = mouseListeners == null ? new Vector(2) : (Vector) mouseListeners.clone(); if (!v.contains(l)) { v.addElement(l); mouseListeners = v; } } protected void fireMouseClicked(MouseEvent e) { if (mouseListeners != null) { Vector listeners = mouseListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((MouseListener) listeners.elementAt(i)).mouseClicked(e); } } } protected void fireMousePressed(MouseEvent e) { if (mouseListeners != null) { Vector listeners = mouseListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((MouseListener) listeners.elementAt(i)).mousePressed(e); } } } protected void fireMouseReleased(MouseEvent e) { if (mouseListeners != null) { Vector listeners = mouseListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((MouseListener) listeners.elementAt(i)).mouseReleased(e); } } } protected void fireMouseEntered(MouseEvent e) { if (mouseListeners != null) { Vector listeners = mouseListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((MouseListener) listeners.elementAt(i)).mouseEntered(e); } } } protected void fireMouseExited(MouseEvent e) { if (mouseListeners != null) { Vector listeners = mouseListeners; int count = listeners.size(); for (int i = 0; i < count; i++) { ((MouseListener) listeners.elementAt(i)).mouseExited(e); } } } public void mouseClicked(MouseEvent e) { } public void mousePressed(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { }} 你如果只想用一个接口,你可以写一个接口继承上面所提到的两个接口就行了。然后在构造类时implements这个接口啊。不过我想不出来会有只能扩展一个接口的理由来。 根据Java的语法,接口是Java实现多重继承的唯一方法,实现两个接口是不矛盾的! 不好意思,我是Java新手,一开始程序写错了,现在好了。我可怜的一百分,就这样丢了。:-(美人25,没意见吧? 继承问题 我很想做个知道 关于IO流的一类问题 怎么样在java里实现在命令行使用自己命名命令? 为什么这两种输出会不同 有关JTree的事件问题,紧急求救各位高手指点 Tomcat 裡配好一個目錄/howjsp怎麼在我的web-inf/classes 的servlet不能運行? 请教,在midlet中怎样的到随机值? 学了一年JAVA,前几天学VC感觉好累 使用jbuilder4编译一个没有任何问题程序都报错,请高人看一下,错误显示在里面. 还发一个查找文件的贴子,给一个相对目录USR0怎样用JAVA查找其下的文件 一个简单的问题,望指点一二
import java.util.*;public class myKeyMouse implements KeyListener, MouseListener{ private transient Vector keyListeners;
private transient Vector mouseListeners; public synchronized void removeKeyListener(KeyListener l) {
if (keyListeners != null && keyListeners.contains(l)) {
Vector v = (Vector) keyListeners.clone();
v.removeElement(l);
keyListeners = v;
}
}
public synchronized void addKeyListener(KeyListener l) {
Vector v = keyListeners == null ? new Vector(2) : (Vector) keyListeners.clone();
if (!v.contains(l)) {
v.addElement(l);
keyListeners = v;
}
}
protected void fireKeyTyped(KeyEvent e) {
if (keyListeners != null) {
Vector listeners = keyListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((KeyListener) listeners.elementAt(i)).keyTyped(e);
}
}
}
protected void fireKeyPressed(KeyEvent e) {
if (keyListeners != null) {
Vector listeners = keyListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((KeyListener) listeners.elementAt(i)).keyPressed(e);
}
}
}
protected void fireKeyReleased(KeyEvent e) {
if (keyListeners != null) {
Vector listeners = keyListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((KeyListener) listeners.elementAt(i)).keyReleased(e);
}
}
}
public void keyTyped(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
public synchronized void removeMouseListener(MouseListener l) {
if (mouseListeners != null && mouseListeners.contains(l)) {
Vector v = (Vector) mouseListeners.clone();
v.removeElement(l);
mouseListeners = v;
}
}
public synchronized void addMouseListener(MouseListener l) {
Vector v = mouseListeners == null ? new Vector(2) : (Vector) mouseListeners.clone();
if (!v.contains(l)) {
v.addElement(l);
mouseListeners = v;
}
}
protected void fireMouseClicked(MouseEvent e) {
if (mouseListeners != null) {
Vector listeners = mouseListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((MouseListener) listeners.elementAt(i)).mouseClicked(e);
}
}
}
protected void fireMousePressed(MouseEvent e) {
if (mouseListeners != null) {
Vector listeners = mouseListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((MouseListener) listeners.elementAt(i)).mousePressed(e);
}
}
}
protected void fireMouseReleased(MouseEvent e) {
if (mouseListeners != null) {
Vector listeners = mouseListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((MouseListener) listeners.elementAt(i)).mouseReleased(e);
}
}
}
protected void fireMouseEntered(MouseEvent e) {
if (mouseListeners != null) {
Vector listeners = mouseListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((MouseListener) listeners.elementAt(i)).mouseEntered(e);
}
}
}
protected void fireMouseExited(MouseEvent e) {
if (mouseListeners != null) {
Vector listeners = mouseListeners;
int count = listeners.size();
for (int i = 0; i < count; i++) {
((MouseListener) listeners.elementAt(i)).mouseExited(e);
}
}
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}
好了。我可怜的一百分,就这样丢了。:-(
美人25,没意见吧?