问答题

请在每条横线处填写一个语句,使程序的功能完整,且输出结果为911。 注意:请勿改动main()主方法和其他已有的语句内容,仅在横线处填入适当的语句。 public class Outer { public static void main(String args[]) { Outer i=new Outer(); i.taskInner(); } public class lnner { private int size; public void doSomething(int size) { __________//访问局部变量 this.size++;//访问内部类的成员变量 __________//访问外部类的成员变量 System.out.println(size+" "+this.size+" "+Outer.this.size); } } public void tasklnner() { __________ k.doSomething(8); } private static int size; }

【参考答案】

size++; Outer.this.size++; Inner k=new lnner();
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请完成下列Java程序:创建一个进度条,可以控制其开始和暂停。要求进度条与线程关联,由线程控制,点击开始按钮开始进度条的滚动,点击停止按钮,暂停,继续点击开始按钮则继续进行。注意:请勿改动main()主方法和其他已有的语句内容,仅在横线处填入适当的语句。import javax.swing.*;import javax.swing.event.*;import java.awt.*;import java.awt.event.*;public class ex15_2 extends JPanel {ThreadProg thProgress;JProgressBar jPb; 声明一个进程条对象static JFrame jf;public ex15_2(){setLayout(new BorderLayout());jPb=new JProgressBar();add(jpb, Center );JPanel btnPanel=new JPanel();JButton btnStart=new JButton( 开始 );btnPanel.add(btnStart);btnStart.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ae){__________;}});JButton btnStop=new JButton( 停止 );btnPanel.add(btnStop);btnStop.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent ae){__________;}});add(btnPanel,BorderLayout.SOUTH);}public void startProgress(){if(thProgress==null||!thProgress.isAlive()){thProgress=new ThreadProg(jpb);thProgress.start();}}public void stopProgress(){thProgress.setStop(true);}public static VOid main(String args[]){jf=new JPrame( ex15_2 );ex15_2 obj15_2=new ex15_2();jf.getContentPane().add( Center ,obj15_2);jf.setSize(250,80);jf.addWindowListener(new WindowAdapter(){pubhc void windowClosing(WindowEvent we){System.exit(0);}});jf.setVisible(true);}}class ThreadProg extends Thread{private JProgressBar jpb;private boolean bStop=false;private boolean bAlive=false;pubhc ThreadProg(JProgressBar jpb){this.jpb=jpb;}public VOid setStop(boolean b){bStop=b;}public void run(){int min=0;int max=60;jpb.setMinimum(min);jpb.setMaximum(max);jpb.setValue(min);for(int x=min;x<=max;x++){if(bStop){break;}else{jpb.setValue(x);try{Thread.sleep(150);} catch(InterruptedException e){}}}bAlive=false;}}