1、精選優質文檔-傾情為你奉上編程題：1編寫一個輸出"Hello World！"的程序，用兩種方式實現（Application、Applet）。application程序public class apublic static void main(String args)System.out.println("Hello World!");2、applet程序public class b extends java.applet.Appletpublic paint(java.awt.Graphics g)g.outstring("Hello Worl

2、d!",10,10);2.求10個數中的最小值并輸出。import java.util.Scanner;public class Test public static void main(String args)int num=new int10;int min;Scanner scan=new Scanner(System.in);System.out.print("請輸入10個數字:");for(int i=0; i<10; i+)numi=scan.nextInt();min=num0;for(int i=1; i<10; i+)if(min&g

3、t;numi) min=numi;System.out.println("最小值是"+min);3.建立一個學生類，其中成員變量為學號，姓名，及三門課成績。另外建立一個包含主方法的類，定義2個學生類的對象，求出這2個學生三門課總分的最高分，并將最高分這個學生的信息輸出。class student String name,no; float eng,math,chi; public student(String name1,String no1,float eng1,float math1,float chi1)name=name1;no=no1;eng=eng1;math=

4、math1;chi=chi1;float sum() return(eng+math+chi);void print() System.out.println("name:"+name+"t no:"+no+"t total:"+sum();public class maxpublic static void main(String args)student s1=new student("lily","001",80,90,50);student s2=new student("lu

5、cy","002",70,70,70);if (s1.sum()>s2.sum() s1.print();else s2.print();4請編寫一個實現如下功能的Application：比較從鍵盤輸入的兩個整數是否相等，并根據比較結果顯示“相等”或“不相等”。import java.util.Scanner;public class COMPare  public static void main(String args )   Scanner tr=new Scanner(System.in); 

6、0; int b=tr.nextInt();   int a=tr.nextInt();   if(a=b)     System.out.println("相等");   else     System.out.println("不相等");  5.編寫一個Application,利用數組求出”HELLO”,”JAVA”PROGRAM”三個字符串的平均長度

7、。class Average public static void main(String args) String array = new String3;array0 = "HELLO"array1 = "JAVA"array2 = "PROGRAM"int total = array0.length();total += array1.length();total += array2.length();System.out.println("平均字符串長度為： " + total/3);6、習題(6_13)：

8、 import java.util.*;class StudentString num;String name;String sex;boolean cleader;float math;float chn;float eng;public Student(String newNum,String newName,String newSex,boolean newCleader,float newMath,float newChn,float newEng)num=newNum;name=newName;sex=newSex;cleader=newCleader;math=newMath;ch

9、n=newChn;eng=newEng;public float sum()return math+chn+eng;public float ave()return sum()/3;public void output()System.out.println(num+"t"+name+"t"+sex+"t"+cleader+"tt"+math+"t"+chn+"t"+eng+"t"+sum()+"t"+ave();public clas

10、s book6_13_2public static void main(String args)String newNum,newName,newSex;boolean newCleader;float newMath,newChn,newEng;Student s=new Student3;for(int i=1;i<=s.length;i+)System.out.println("請輸入第"+i+"個學生的信息");Scanner reader=new Scanner(System.in);System.out.print("請輸入該

11、學生學號：");newNum=reader.nextLine();System.out.print("請輸入該學生姓名：");newName=reader.nextLine();System.out.print("請輸入該學生性別：");newSex=reader.nextLine();System.out.print("請輸入該學生是否為班干部：");newCleader=reader.nextBoolean();System.out.print("請輸入該學生數學成績：");newMath=reade

12、r.nextFloat();System.out.print("請輸入該學生語文成績：");newChn=reader.nextFloat();System.out.print("請輸入該學生英語成績：");newEng=reader.nextFloat();si-1=new Student(newNum,newName,newSex,newCleader,newMath,newChn,newEng);System.out.println("學號t姓名t性別t班干部否t數學t語文t英語t總分t平均分");for(int i=1;i&l

13、t;=s.length;i+)si-1.output();7、/第5章第11題import java.io.*;public class Exercises5_11 public static void main(String args) throws IOException String str; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print("請輸入字符串，輸入exit退出："); do str=buf.readLine(); S

14、ystem.out.println(str); while(!str.equals("exit"); 8、定義一個Person類，該類具有姓名、身高、體重、年齡屬性，能夠對上述相關信息進行輸出display()。由Person類派生出China類，增加愛好屬性。.class Person private String name; private int age; private float hight; private float weight; public Person(String n,int a,float h,float w) name=n; age=a; hig

15、ht=h; weight=w; public void show() System.out.println("Person name ="+name +",age=" + age + ", hight=" + hight + ", weight=" + weight + ""); class China extends Person private String hobby; public China(String n,int a,float h,float w,String hob)super

16、(n,a,h,w); hobby=hob; public void display() System.out.println( "China hobby=" + hobby + ""); public class E8_1 public static void main(String args) China cc =new China("wenwen",23,168,104,"sing"); cc.show(); cc.display(); 9、創建一個圖形類，包括計算圖形面積的方法。創建兩個子類長方形、圓形，分別

17、繼承圖形類，重寫子類中的計算圖形面積的方法。寫一個測試類，分別創建一個長方形和圓形類的對象，并且分別計算這兩個圖形的面積./filename：app8_2.java 抽象類的說明abstract class Shape protected String name; public Shape(String xm) name=xm; System.out.print("名稱："+name); abstract public double getArea();class Circle extends Shape private final double PI=3.14; priv

18、ate double radius; public Circle(String shapeName,double r) super(shapeName); radius=r; public double getArea() return PI*radius*radius; class Rectangle extends Shape private double width; private double height; public Rectangle(String shapeName,double width,double height) super(shapeName); this.wid

19、th=width; this.height=height; public double getArea() return width*height; public class E8_2 public static void main(String args) Shape rect =new Rectangle("長方形",6.5,10.3); System.out.println("；面積="+rect.getArea(); Shape circle=new Circle("圓",10.2); System.out.println(&

20、quot;；面積="+circle.getArea(); 10、編寫一個“Student”類，該類擁有屬性：校名、學號、性別、出生日期。方法包含構造方法和輸出方法。再編寫“Student”類的子類：Undergraduate（大學生）。Undergraduate類除擁有父類屬性和方法外，還有其自己的屬性和方法：附加屬性包括系（department）、專業(major)；方法包含構造方法和輸出方法。class Student String name; int sNum; String sex; String birth; String sname; int Score; public

21、Student(String name1,int sNum1, String sex1,String birth1, String sname1,int Score1) name=name1; sNum=sNum1; sex=sex1; birth=birth1; sname=sname1; Score=Score1; void show() System.out.println("所在學校："+name); System.out.println("學號："+sNum); System.out.println("性別："+sex);

22、System.out.println("生日："+birth); System.out.println("姓名："+sname); System.out.println("成績："+Score); class Undergraduate extends Student String department; String major; public Undergraduate(String name1,int sNum1, String sex1,String birth1, String sname1,int Score1,Strin

23、g department1,String major1) super(name1,sNum1,sex1, birth1, sname1, Score1); department=department1; major=major1; void show1() super.show(); System.out.println("系部："+department); System.out.println("專業："+major); public class aa public static void main(String arg) Undergraduate

24、B=new Undergraduate("湖南*學院","男","1988/08/08","許翼",95,"信息工程系","計算機網絡"); B.show1(); 11、按以下要求編寫程序(1) 編寫Animal接口，接口中聲明run() 方法(2) 定義Bird類和Fish類實現Animal接口(3) 編寫Bird類和Fish類的測試程序，并調用其中的run()方法Bird類的run()方法輸出"鳥兒在飛."Fish類的run()方法輸出"魚兒

25、在游."解答：public interface Animal void run();class Bird implements Animal public void run() System.out.println("鳥兒在飛.");class Fish implements Animal public void run() System.out.println("魚兒在游.");public class TestAnimal public static void main(String args) Bird bird = new Bird()

26、;bird.run();Fish fish = new Fish();fish.run();12、按以下要求編寫程序(1) 創建一個Rectangle類，添加width和height兩個成員變量(2) 在Rectangle中添加兩種方法分別計算矩形的周長和面積(3) 編程利用Rectangle輸出一個矩形的周長和面積public class Rectangle float width, height;public Rectangle(float width, float height) this.width = width;this.height = height;public float g

27、etLength()return (this.width + this.height) * 2;public float getArea()return this.width * this.height;public static void main(String args) Rectangle rect = new Rectangle(10, 20);System.out.println("周長是：" + rect.getLength();System.out.println("面積是：" + rect.getArea();13、由person類派生出

28、student類和teacher類import java.io.*;import java.util.*;class personprivate String name,sex,birth;public person(String n1, String s1, String b1)name=n1;sex=s1;birth=b1;void display()System.out.println("name: "+name+"nSex: "+sex+"nbirthday: "+birth);class student extends pe

29、rsonprivate String cl;private int no;private float total; public student(String c,int num,float to,String n2,String s2,String b2) super(n2,s2,b2); cl=c; no=num; total=to;void displays()System.out.println("-Display-nThe student's ");display();System.out.println("Class: "+cl+&q

30、uot;nNo: "+no+"nTotal score: "+total);class teacher extends personprivate String dp;private float wage; public teacher(String d,float w,String n2,String s2,String b2) super(n2,s2,b2); dp=d; wage=w;void displayt()System.out.println("-Display-nThe teacher's ");display();Sy

31、stem.out.println("Department profession:"+dp+"nWage:"+wage);public class sttry public static void main(String args) throws IOException String n2,s2,b2,c,d;int num,ch;float to,w; Scanner reader=new Scanner(System.in); BufferedReader buf; buf=new BufferedReader(new InputStreamReade

32、r(System.in);while(true)System.out.println("-Meun-n1.Input studentn2.Input teachern3.ExitnEnter:");ch=reader.nextInt();switch(ch)case 1:System.out.println("-Input-");System.out.print("Input student's name:");/n2=reader.next(); n2=buf.readLine(); System.out.print(&qu

33、ot;Input sex:");s2=reader.next();System.out.print("Input birthday:");b2=reader.next();System.out.print("Input class:");c=reader.next();System.out.print("Input No:");num=reader.nextInt();System.out.print("Input total score:");to=reader.nextFloat();student

34、obj1=new student(c,num,to,n2,s2,b2);obj1.displays();break;case 2:System.out.println("-Input-");System.out.print("Input teacher's name:");/n2=reader.next(); n2=buf.readLine(); System.out.print("Input sex:");s2=reader.next();System.out.print("Input birthday:"

35、;);b2=reader.next();System.out.print("Input department profession:");d=reader.next();System.out.print("Input wage:");w=reader.nextFloat();teacher obj2=new teacher(d,w,n2,s2,b2);obj2.displayt();break;case 3:System.exit(0);default:System.out.println("Error!Please enter again!&

36、quot;);14、設計一個窗口，在窗口中擺放兩個按鈕，若按鈕被點擊了，就將該按鈕上的標記改為“已按過”。/e1.java 簡單的事件處理程序（已加入事件處理）import java.awt.*; import javax.swing.*;import java.awt.event.*;public class e1 extends JFrame implements ActionListener static e1 frm=new e1(); static Button b1=new Button("button1"); static Button b2=new Butt

37、on("button2"); public static void main(String args) b1.addActionListener(frm); /把監聽者frm向事件源b1注冊 b2.addActionListener(frm); /把監聽者frm向事件源b2注冊 frm.setTitle("操作事件"); frm.setLayout(new FlowLayout(); frm.setSize(260,170); frm.add(b1); frm.add(b2); frm.setDefaultCloseOperation(JFrame.EX

38、IT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) if (e.getSource()=b1) b1.setLabel("已按過"); else b2.setLabel("已按過"); 15、設計一個窗口，其中包含兩個標簽（一個用于給出提示信息，另一個用來輸出結果）和一個文本框。要求從文本框中獲取用戶給出的一個整數，并將該數的絕對值在第二個標簽上輸出。 /e2.java 簡單的事件處理程序（已加入事件處理）import java.awt.*; imp

39、ort javax.swing.*;import java.awt.event.*;public class e2 extends JFrame implements ActionListener static e2 frm=new e2(); static JButton b1=new JButton("提交"); static JLabel l1=new JLabel("請輸入一個整數"); static JLabel l2=new JLabel("顯示結果"); static JTextField t1=new JTextFie

40、ld(10); public static void main(String args) b1.addActionListener(frm); /把監聽者frm向事件源b1注冊 / frm.setTitle("操作事件"); frm.setLayout(null); frm.setSize(460,370); l1.setBounds(20,10,100,25); t1.setBounds(140,10,170,25); l2.setBounds(20,30,170,25); b1.setBounds(70,135,150,25); frm.add(b1); frm.add

41、(l1); frm.add(l2); frm.add(t1); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) int x=Integer.parseInt(t1.getText(); l2.setText(Math.abs(x)+" "); 16、13-6/第13章第6題import java.awt.*;import javax.swing.*;import java.awt.event

42、.*;import java.awt.Rectangle;public class Exercises13_6 extends JFrame implements ActionListener static Exercises13_6 frm = new Exercises13_6(); static JButton b1 =new JButton(); static int i=0; public static void main(String args) b1.addActionListener(frm); /把監聽者frm向事件源b1注冊 frm.setSize(300, 200); f

43、rm.setTitle("JFrame"); frm.add(b1); b1.setBounds(new Rectangle(71, 40, 147, 49); b1.setText("開始點擊"); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) i+; b1.setText("被點擊"+i+"次"); 17、Lab68/copy

44、.java 簡單的事件處理程序（已加入事件處理）import java.awt.*; ;import javax.swing.*;import java.awt.event.*;public class copy implements ActionListener JButton b; JTextField L,R; public void display() JFrame f=new JFrame(); f.setSize(400,150); f.setBackground(Color.lightGray); f.setLayout(new FlowLayout(FlowLayout.LEFT); L=new JTextField(10); R=new JTextField(10); b=new JButton("復制"); f.add(L); f.add(R); f.add(b); b.addActionListener(this); f.setDefaultCloseOperation(JFrame.EXIT_O