Java期末练习题和答案docx.docx

1、Java期末练习题和答案docx1、 已知数组a=4,67,32,78,56,13,90,48,22,编程实现求该数 组最大值并输出的方法。Answer：public class Cone (public static void main(String args)(int a= 4,67,32,78,56,13,90,48,22;int max = a0;for(int temp: a) (if(tempmax) (max = temp;System.out.println(The max is : +max);2、 编写程序实现求0150之间的奇数的乘积；Answer：public clas

2、s Cone (public static void main(String args)(long result = 1;for(int i=l;ivl50;i=i+2)result = result *i;System.out.println( The result is : +result);3、 已知类People里含有属性money初值是20,方法void work(int m)实现增加m至!1 money里，定义它的子类 ChinaPeople,重写方法void work(int m)实现把增加m到 money里(体现汇率变化)。class People (double money

3、= 20;void work(int m)(money = money +m;System.out.println(nThe money of people is:+money); class ChinaPeople extends People ( double money = 20;void work(int m) money = money + m*0.6;System.out.println(The money of people is:+money); public class Cone(public static void main(String args) (People p =

4、 new People();ChinaPeople cp = new ChinaPeople();p.work(200);cp.work(200);4、 定义接口 Worker,有一个方法login()实现打卡功能。定义该接口实现类ChinaWorker,给出login()的具体实现，只需输出“我来了！”即可。interface Worker ( void login();class ChinaWorker implements Workerpublic void login() (System.out.println(H我来啦!);)public class Cone(public stat

5、ic void main(String args)(Worker cw = new ChinaWorker();cw.login();5、 使用Scanner类实现从键盘输入一句英文，主程序实现把这句英文的单词按照字典顺序排序输出。Answer：import java.util.*;public class Cone(public static void main(String args)(Scanner scan = new Scanner(System.in);String str = scan.nextLine();String temp = str.split();SortString

6、. sort(temp);for(String s:temp)(System.out.print( +s);)class SortString (public static void sort(String a) (int count=0;for(int i=O;ia.length-l;i+) (for(int j=i+l ;ja.length;j+) (if(pareTo(ai)=60)area.setText(及格！ ”)；else area.setText(不及格！)；public class Cone(public static void main(String args)(new f

7、rame();11、编写一个应用程序，该程序的窗口依次有一个标签（“请 输入打开的文件名，含扩展名”)，一个用于输入的文本框， 一个文本区，一个按钮。用户在文本框输入一个文件的名字(包含扩展名)，单击按钮，程序在文本区显示文件的内容。Answer：import javax.swing.*;import java.awt.event.*;import java.awt.*;import java.io.*;class frame extends JFrame implements ActionListener (JButton button;JTextField text;JTextArea a

8、rea;frame() (setLayout(new FlowLayout();button = new JButton(Submit);text = new JTextField(20);area = new JTextArea(10,10);button.addActionListener(this);add(new JLabel(”请输入打开的文件名，含扩展名”)；add(text);add(area);add(button);setVisible(true);setBounds(l00,200,100,200);setDefaultCloseOperation(JFrame.EXIT_

9、ON_CLOSE);public void actionPerformed(ActionEvent e)(String str = text.getText().trim();File input = new File(str);if(!input.exists()(text.setText(1 Input again!);else (try (FilelnputStream in = new FilelnputStream(input);BufferedReader reader = new BufferedReader(new InputStreamReader(in);String li

10、ne = reader.readLine();while(line != null)(area.append(line+nn);line = reader.readLine();catch(IOException ex) (System.out.println(ex); )public class Cone(public static void main(String args) (new frame();12、编写一个应用程序，该程序的窗口依次有一个标签(“请 输入字符串”)，一个用于输入的文本框，一个按钮。用户在 文本框输入一个字符串，单击按钮，程序在控制台输出字符 串的长度。Answer

11、：import j avax. swing.*;import java.awt.event.*;import java.awt.*;class frame extends JFrame implements ActionListener (JButton button;JTextField text;frame() (setLayout(new FlowLayout();button = new JButton( Submit);text = new JTextField(20);button. addActionListener(thi s);add(new JLabel(n 请输入字符串”

12、)；add(text);add(button);setVisible(true);setB ounds(l00,200,100,200);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void actionPerformed(ActionEvent e)(String str = text.getText();System.out.println(nthe length of n+str+ is +str.length();public class Cone(public static void main(String args)

13、(new frame();13、假设工资单由基础工资、岗位津贴、绩效津贴、医疗补助、独生子女补助等组成，比如一个典型的工资单如下：“基础工资：1500.00,岗位津贴：1000,绩效津贴：500,医疗补助：130.45,独生子女费：5。”编写一个应用程，要求使用StringTokenizer类编写算法输出该工资单的各项数值，并计算求工资总和。Answer：import java.util.*;public class Conepublic static void main(String args) (String str = ”基础工资：1500.00,岗位津贴:1000,绩效津贴：500,医

14、疗补助：130.45, 独生子女费：5oStringTokenizer each = new StringTokenizer(str,，);while(each.hasMoreTokens() (System.out.println(each.nextToken();StringTokenizer pay = new StringTokenizer(str,基础工资：，岗位津贴:，绩效津贴:，医 疗补助：，独生子女费：。)；double sum = 0;String temp;while(pay.hasMoreTokens() (temp = pay.nextToken();sum += Double.parseDouble(temp);System.out.println(HThe sum of pay is n+sum);