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发布时间:2024-02-16 04:56:58

[填空题]bar为一JScrollBar组件,阅读下面程序段,请在程序中的画线处填入正确的语句使程序能够正确运行。
...
public WellAdjusted( )

super("Well Adjusted");
setSize(350,100);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane = new JPane( );
pane.setLayout(new BorderLayout( ));
pane.add(value,"Center"):
pane.add(bar,"South");
setContentPane(pane);

public void adjustmentValueChanged(AdjustmentEvent evt)

【12】
if(source ==bar)

int newValue bar.getValue( );
value.setText(""+newValue);

repaint( );

更多"bar为一JScrollBar组件,阅读下面程序段,请在程序中的画线处"的相关试题:

[填空题]bar为一JScrollBar组件,阅读下面程序段,请在程序中的画线处填入正确的语句使程序能够正确运行。
...
public WellAdjusted( )

super("Well Adjusted");
setSize(350,100);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane = new JPane( );
pane.setLayout(new BorderLayout( ));
pane.add(value,"Center"):
pane.add(bar,"South");
setContentPane(pane);

public void adjustmentValueChanged(AdjustmentEvent evt)

【12】
if(source ==bar)

int newValue bar.getValue( );
value.setText(""+newValue);

repaint( );

[填空题]bar为一JSerollBar组件,阅读下面程序段,请在程序中的画线处填入正确的语句使程序能够正确运行。

public WellAdjusted( )

super("Well Adjusted");
setSize(350,100);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane=new JPane( );
pane.setLayout(new BorderLayout( ));

pane.add(value,"Center"):
pane.add(bar,"South");
setContentPane(pane);

public void adjustmentValueChanged(AdjustmentEvent evt)

【12】
if(source==bar)

int newValue bar.getValue( );
value.setText(""+newValue);

repaint( );


[填空题]阅读下面程序段,SelectItem应用程序显示从文本域的组合框中进行选择,请在程序中的画线处添上正确的语句使得程序能够正确运行。 ... JTextField result = new JTextField( ); JComboBox pick = new JComboBox ( ); public SelectItem( ) { super ("Select Item"); pick.addItemListener(this); pick.addItem("Navigtor"); pick.addItem("Internet Explorer"); pick.addItem("Opera"); pick.setEditable(false); result.setHorizontalAlignment(SwingConstants.CENTER); result, setEditable (false); pane.setLayout(new BorderLayout( )); 【12】 pane.add(pick,"Center"); pane.add(result,"South"); setContentPane(pane); } public void itemStateChanged(ItemEvent evt) { Object source = evt.getSource( ); if(source == pick) { Object newPick = evt.getItem( ); result .setText(newPick.toString( )+" is the selection. "); } repaint( ); }
[填空题]下面的应用程序中有一个组,组内有4个单选按钮,请在画线处填入正确的语句使程序能正确运行。
import javax.swing.*;
public class OneTeam extends JFrame

JRadioButten[] teams = new JRadioButten[3];
public OneTeam( )

super("One Team");
setSize (140,160);
setDefaultCloseOperatien(JFrame.EXlT ON CLOSE);
JPanel pane = new JPanel( );
teams[0] = new JRadioButton("red choose");
teams[1] = new JRadieButton("blue choose");
teams[2] = new JRadieButten("green choose");
______;
for (int i = 0i < teams.length;i++)

group.add(teams[i]);
pane.add(teams[i]);

setContentPane(pane);

public static void main(String arguments[])

OneTeam ot= new OneTeam( );
ot.show( );


[填空题]下面的应用程序中有一个组,组内有4个单选按钮,请在画线处填入正确的语句使程序能正确运行。 import javax.swing.*; public class OneTeam extends JFrame { JRadioButten[] teams = new JRadioButten[3]; public OneTeam( ) { super("One Team"); setSize (140,160); setDefaultCloseOperatien(JFrame.EXlT ON CLOSE); JPanel pane = new JPanel( ); teams[0] = new JRadioButton("red choose"); teams[1] = new JRadieButton("blue choose"); teams[2] = new JRadieButten("green choose"); 【11】 ; for (int i = 0i < teams.length;i++) { group.add(teams[i]); pane.add(teams[i]); } setContentPane(pane); } public static void main(String arguments[]) { OneTeam ot= new OneTeam( ); ot.show( ); } }
[单项选择]阅读下面的程序段: public class Sun { public static void main(String args[ ]) { int a=0 for(int i=1;i<=3;i++) { for(int j=1;j<-i;j++) { for(int k=j;k<=3;k++) { a=a+1; } } } System.out.println(A) 我; }}执行上面的3重循环后,a的值为( )。
A. 3
B. 9
C. 14
D. 21
[单项选择]阅读下面的程序段:
publiC class Sun

public static void main (String args[ ])

int a=0;
for(int i=1;i<=3;i++)

for(int j=1;j<=i;j++)

for(int k=j;k<=3;k++)

a=a+1;



System.out.println(
A. ;
B. 9
C. 14
D. 21
[单项选择]在下面的定义语句中,画线处应填入的内容是
class Fred
public:
void print( )cout<<data<<endl;
void setData(double D) data=d;
static int count;
private:
double data;

______count=0;//静态数据成员的定义
A. int
B. static int
C. int Fred::
D. static int Fred::
[填空题]通过实现Runnable接口创建线程,请在画线处加入正确的代码完成此程序 【9】
public class ThreadTest

public static void main(String args[ ]

Thread t1 = new Thread(new Hello( )
Thread t2 = new Thread(new Hello( )
___________;
t2.start( );


class Hello implements Runnable

int i;
public void run( )

while (true)

System.out.println("Hello"+i++
if(i==5) break;



[填空题]通过实现Runnable接口创建线程,请在画线处加入正确的代码完成此程序 【9】 。 public class ThreadTest { public static void main(String args[ ] { Thread t1 = new Thread(new Hello( ) Thread t2 = new Thread(new Hello( ) ___________; t2.start( ); } } class Hello implements Runnable { int i; public void run( ) { while (true) { System.out.println("Hello"+i++ if(i==5) break; } } }
[填空题]下面程序构造了一个Swing Applet,在下画线处填入正确的代码。 import javax.swing.*; import java.awt.*; public class SwingApplet extends ______ {  JLabel 1=new JLabel("This is a Swing Applet.");  public void init( ) {   Container contentPane=getContentPane( );   contentPane.add(1);  } }

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