30．用getImage()方法和drawImage()方法能加載和顯示圖像,。以下程序加載的是seattle．jpg文件,，并假定該文件與包含這個小應(yīng)用程序的HTML文件在同一個目錄下,。

import java.awt.*; import java.applet.*;

public class SimpleImageLoad extends Applet{

Image img;

public void init() {

img = getImage(______,"seattle.jpg");

}

public void paint(Graphics g) {

g.drawImage(img, 0, 0, ______);

}

}

31．以下程序段定義的類ShareDataManager用于管理多個線程共享數(shù)據(jù)data,。為了對data的取,、存和修改操作保持完整,，多線程在data上的操作有互斥要求,；另外,，限制線程對data的修改不能讓data為負數(shù),，所以多線程在data上的操作還有同步要求。為此,，程序為管理data上的操作定義成類,，以下是管理共享數(shù)據(jù)data的類ShareDataManager的代碼。

class ShareDataManager {

int data;

ShareDataManager(int init){data = init; }

public int getData(){ return data;}

private void putData(int newValue){ data = newValue;}

synchronized void modiData(int delta){

if (delta >= 0) {putData(getData()+ delta);

} else  {

while (______<0) {

try {wait(); } catch (InterruptedException e) { }

}

putData(getData()+ delta);

}

______;

}

}

五,、程序分析題(本大題共5小題,，每小題4分，共20分)

32．閱讀下列程序,，請寫出該程序的輸出結(jié)果,。

class Tree {

private String name;public boolean flower;

public int birthYear;

Tree(String n, boolean f, int y){ name = n; flower = f; birthYear = y; }

public void setName(String n){name = n;}

public String getName(){return name; }

public void printTree(String str){

System.out.println(str);  System.out.println("Name:"+name);

System.out.println("Birth Year:"+birthYear);

System.out.println("Flower:"+flower);

}

}

class PineTree extends Tree {

public boolean coniferous = true;

PineTree(String n, boolean f, int y, boolean c){super(n, f, y);coniferous = c; }

public void printTree(String str){

super, printTree(str);

System.out.println("Coniferous:" + coniferous);

}

}

class Test32 {

public static void main(String []args){

Tree fOb = new Tree("May Flower", true, 1980);

PineTree sOb = new PineTree("Pine", false, 2000, true);

fOb.printTree(" fOb:"); sOb.printTree("sOb:");

}

}

33．閱讀下列程序，請寫出該程序的輸出結(jié)果,。

class Test33 {

static void  s (int b[ ], int k) {

int i, j, t;

for(i = 1;i< k; i++) {

for(t = b[i], j = i-1; j >= 0 && t < b[j]; j--)

b[j+l] = b[j];

b[j+ 1 ] = t;

}

}

public static void main(String []args){

int i, a[] = {6, 12, 7, 11, 5 };

s(a, 5);

for(i = 0;i< a.length; i++) System.out.print(a[i]+" ");

System. out. Println();

}

}

34．閱讀下列程序,，請寫出該程序的功能。

import java.applet.*; import javax.swing.*;

import java.awt.*;  import java.awt.event.*;

public class Test34 extends Applet implements ActionListener {

JTextField text;int r; JPanel panel;

public void paint(Graphics g){

Graphics gc = panel.getGraphics();

gc.clearRect(0,0, panel.getWidth(), panel.getHeight());

gc.setColor(Color.red); gc.fillOval(10, 10, r, r);

}

public void init() {

text = new JTextField(10);  panel = new JPanel();

setSize(200, 100);  setLayout(new GridLayout(2,1));

add(text); add(panel);  text.addActionListener(this);

}

public void actionPerformed(ActionEvent e) {

if (e.getSource() == text) {

r = Integer.parseInt(text.getText());

repaint();

}

}

}

35．閱讀下列程序,，請回答以下問題：

(1)該程序的菜單條中共有幾個菜單項?

(2)單擊哪個菜單項,，可以打開一個對話框?

(3)該對話框是強制型還是非強制型?

(4)該對話框中顯示的是什么內(nèi)容?

Import javax.swing.*;import java.awt.*;

import java.awt.event.*; import java.util.*;

class MyDialog extends JDialog {

MyDialog(JFrame F, String s) {

super(F, s, false);  Date date = new Date();

String t = date.toString();  JLabel text = new JLabel(t);

add(text);  setSize(200,100);  setVisible(true);

}

}

public class MenuDemo extends JFrame implements ActionListener {

JMenuBar menubar;  JMenu action;

JMenuItem show, set, quit;

public MenuDemo() {

menubar = new JMenuBar();      setJMenuBar(menubar);

action = new JMenu(''操作'')；    menubar.add(action);

show= new JMenuItem(''顯示''),   action.add(show);

set = new JMenuItem("設(shè)置");    action.add(set);

action.addSeparator();           quit = new JMenuItem("退出");

action.add(quit);               show.addActionListener(this);

set.addActionListener(this);      quit.addActionListener(this);

setSize(300,300);              setVisible(true);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource() == show) {MyDialog diag = new MyDialog(this, "信息");}

else if(e.getSource()== set) { this.setTitle("菜單演示");}

else if(e.getSource() == quit){   System.exit(0);   }

}

public static void main(String[] args) {new MenuDemo();}

}

36．閱讀以下程序,，請寫出該程序的輸出結(jié)果,。

class CurrentThreadDemo {

public static void main(String args[]) {

Thread t = new Thread();  System.out.println("Current thread");

t.setName("My Thread");  System.out.println("After name change");

try {for(int n = 3; n > 0; n--) {

System.out.println(n);  Thread.sleep(1000);

}

} catch (InterruptedException e) {

System.out.println("Main thread interrupted");

}

}

}

六、程序設(shè)計題(本大題共2小題,，每小題6分,，共12分)

37．編寫方法int searchMaxNumIndex(int[]a)，尋找已知數(shù)組中最大數(shù)的下標并返回,。

38．以下程序的界面有一個按鈕button,、一個文本區(qū)textA和一個文本框textF。程序運行時,，在文本區(qū)中輸入數(shù)字序列,，單擊按鈕，則在文本框中顯示數(shù)字序列的和,。以下是要求你編寫的actionPerformed(ActionEvent e)方法的部分代碼,。

public void actionPerformed(ActionEvent e) {

if (e.getSource() == button) {

String s = textA.getText();  double sum =0;

StringTokenizer fenxi = new StringTokenizer(s, " ,\n");

//請在以下位置編寫代碼