Java编程题目及答案.doc

1. 从键盘输入10个整数，存储到一个数组中，然后找出其中最大值和最小值，并给出他们在数组中的下标。import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.IOException;public class jfa public static void main(String args) int Numbers = new int10;BufferedReader r = new BufferedReader(new InputStreamReader(System.in);try for (int i=0;iNumbers.length; i+) Numbersi = Integer.parseInt(r.readLine(); catch(IOException e) int Max = Numbers0, Min = Numbers0;int MaxSubscript = 0, MinSubscript = 0;for (int i=1;i Max)Max = Numbersi;MaxSubscript = i;if (Numbersi Min) Min = Numbersi;MinSubscript = i;for (int i=0; i Numbers.length; i+)System.out.print(Numbersi + );System.out.print(n);System.out.println(最大的数字：+Max+下标：+MaxSubscript);System.out.println(最小的数字：+Min+下标：+MinSubscript);2. 最简单的Java程序（输出“你好”的Applet和Application程序）import java.awt.*;import java.applet.*;public class c1_1 extends Applet public void paint(Graphics g) g.drawString(“你好”,25,25);public class c1_2 public static void main(String args) System.out.println(“你好”);3. 计算圆的面积（Applet和Application）import java.awt.*;import java.applet.*;public class c2_1 extends Applet double cparea(double r) return Math.PI * r * r;public void paint(Graphics g) double b = 12;g.drawString(面积是：+cparea(b),25,25);public class c2_2 static double cparea(double r) return Math.PI * r * r;public static void main(String args) double b = 12;System.out.println(面积是：+cparea(b);import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.IOException;public class c2_2 static double cparea(double r) return Math.PI * r * r;public static void main(String args) throws IOException BufferedReader x = new BufferedReader(new InputStreamReader(System.in);System.out.println(面积是：+cparea(Double.parseDouble(x.readLine();4. 设定5个字符串并只打印那些以字母“b”开头的串。P165 7.5public class j7_5 public static void main(String args) String s = new String5;s0 = GHASFDSGSERGFFHGFb;s1 = bdfGDFDFGfdgdfgfd;s2 = SAFSA$%#%#$;s3 = abaaaaaaaasdad;s4 = btgsgtetesrhyrsyr;for (int i = 0; i s.length; i+) if (si.startsWith(b) System.out.println(si);5. 创建一个链表Lf，创建三个结点N1、N2、N3，按下列要求将三个结点放入链表Lf中，编程实现：(1) 将N2作为链表的头结点；(2) 将N1作为链表的尾结点；(3) 将N3作为链表的中间结点；(4) 打印链表Lf的所有结点。class Node int data; Node next; Node(int i) data= i; next=null;class List private Node head,tail; String Lname; List(String str) Lname=str; head = null; tail = null; void addTail(Node obj) if (head = null) head = obj;tail=obj; else tail.next = obj;tail=obj; void addHead(Node obj) if (head = null) head = obj; tail=obj; else obj.next = head; head = obj; void ShowAll() Node p = head; while (p != null) System.out.println(p.data); p = p.next; public class j8_4 public static void main(String args) Node n1 = new Node(1), n2 = new Node(2), n3 = new Node(3); List l = new List(Lf); l.addHead(n2); l.addTail(n3) ; l.addTail(n1); l.ShowAll(); 6. 输出自己的名字、班级及学号，要求名字设置为24号黑体，班级及学号设置为16号加粗斜宋体。P214 9.7import java.awt.*;import java.applet.*;public class j9_7 extends Applet public void paint(Graphics g) Graphics2D g2 = (Graphics2D)g; g2.setFont(new Font(黑体, Font.PLAIN, 24); g2.drawString(姓名:张三t, 25, 35); g2.setFont(new Font(宋体, Font.BOLD + Font.ITALIC, 16); g2.drawString(班级:计科0601t, 25, 60); g2.drawString(学号: 0000001t, 25, 85); 7. 建立一个班级下拉式列表，列表项中有101班、102班、103班、104班和105班，当点击某个选项时，将这个选项的内容复制到按钮文本中。要求字体大小为24号，颜色为红色。import java.awt.*;import java.awt.event.*;import javax.swing.*;public class j6_3 extends JFrame JPanel contentPane;JComboBox combo;JButton button = new JButton();public j6_3() enableEvents(AWTEvent.WINDOW_EVENT_MASK); try jbInit(); catch(Exception e) e.printStackTrace(); this.setVisible(true); public static void main(String args) new j6_3();private void jbInit() throws Exception contentPane = (JPanel)this.getContentPane();contentPane.setLayout(new FlowLayout(FlowLayout.LEFT);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setSize(new Dimension(400, 300);combo = new JComboBox();combo.addItemListener(new ItemList(); combo.addItem(101班); combo.addItem(102班); combo.addItem(103班); combo.addItem(104班); combo.addItem(105班); contentPane.add(combo); contentPane.add(button);class ItemList imple