更多"下面ChangeTitle( )中对b1和b2按钮构造监听器,实现当单"的相关试题:
[填空题]下面ChangeTitle( )中对b1和b2按钮构造监听器,实现当单击b1按钮时标题变为students,当单击b2按钮时标题变为teachen。请将程序补充完整。
public ChangeTitle( ) {
super("Title Bar");
b1. addActionListener(this); 【15】
Jpanel pane = new Jpanel( );
Pane.add(b1);
Pane.add(b2);
SetContentPane(pane);
}
public void actionPefformed(ActionEvent evt){
Object sourve = evt. getSource( );
if (sourve ==b1)
setTitle("Students");
else if (source == b2)
setTitle("Teachers ");
repaint( );
}
[填空题]下面ChangeTitle( )中对b1和b2按钮构造监听器,实现当单击b1按钮时标题变为 students,当单击b2按钮时标题变为teachers。请将程序补充完整。
publicChangeTitle( ){
super(“TitleBar”);
b1.add AcdtionListener(this);
JpanelpanexneWJpanel( );
Pane.add(b1);
Pane.add(b2);
SetCOntentPane(pane);
}
public VOidaction Performed(ActiOnEventev0{
Objectsourve=evt.getSOurce( );
if(SOUrve=b1)
setTitle("Students");
elSeif(source==b2)
SetTitle("TeaCherS");
repaint( );
}
[填空题]下面ChangeTitle( )中对b1和b2按键构造监听器,实现当按下b1键时标题变为Students,当按下b2键时标题变为Teachers。添加空缺的语句。
...
public ChangeTitle( )
{
super("Title Bar");
b1.addActionListener(this);
【11】 ;
Jpanel pane = new Jpane1( );
Pane.add(b1);
Pane.add(b2);
SetContentPane(pane);
}
public void actionPerformed(ActionEvent evt)
{
Object sourve = evt.getSource( );
if (sourve ==b1)
setTitle("Students");
else if (source == b2)
setTitle("Teachers");
repaint( );
}
...
[填空题]请在下面代码中加入监听器语句。
importjava.awt.*;
importjava.applet.Applet;
publicclassSimpleextendsAppleimplementsMouseListener
StringBuffer;
publicvoidinit( )
//监听器语句
buffer=newStringBuffer( );
addltem(“initializing…”);
publicvoidmoseEntered(MouseEventevent)
publicvoidmoseExited(MouseEventevent)
publicvoidmosePressed(MouseEventevent)
publicvoidmoseReleased(MouseEventevent)
publicvoidmoseClicked(MouseEventevent)
addltem(“click!…”);
[填空题]请在下面代码中加入监听器语句 【15】 。
import java.awt.*;
import java.applet.Applet;
public class Simple extends Applet implements MouseListener
StringBuffer;
Public void init( )
______//加监听器语句
buffer = new StringBuffer( );
addItem("initializing..... ");
Public void moseEntered(MouseEvent event)
Public void moseExited(MouseEvent event)
Public void mosePressed(MouseEvent event)
Public void moseReleased(MouseEvent event)
Public void moseClicked(MouseEvent event)
addItem ("click!...");
[填空题]请在下面代码中加入监听器语句。
import java.awt.*;
import java.applet.Applet;
public class Simple extends Apple implements MouseListener
StringBuffer;
public void init( )
//监听器语句
buffer=new StringBuffer( );
addItem("initializing…");
public void moseEntered(MouseEvent event)
public void moseExited(MouseEvent event)
public void mosePressed(MouseEvent event)
public void moseReleased(MouseEvent event)
public void moseClicked(MouseEvent event)
addltem("click!…");
[填空题]请在下面代码中加入监听器语句 【15】 。
import java.awt.*;
import java.applet.Applet;
public class Simple extends Applet implements MouseListener
{
StringBuffer;
Public void init( )
{
______//加监听器语句
buffer = new StringBuffer( );
addItem("initializing..... ");
}
Public void moseEntered(MouseEvent event)
{}
Public void moseExited(MouseEvent event)
{}
Public void mosePressed(MouseEvent event)
{}
Public void moseReleased(MouseEvent event)
{}
Public void moseClicked(MouseEvent event)
{
addItem ("click!...");
}
}