编程题1(中创).doc

编程题：（中创八套）1.36块砖，36人搬。男搬4，女搬3，两个小儿抬一砖。要求一次全搬完。需男、女、小儿各若干？1.public class test public static void main(String args) int man = 0; int woman = 0; int kids = 0; for (man = 0; man 36; man+) for (woman = 0; woman 36; woman+) for (kids = 0; kids 36; kids+) if (man * 4 + woman * 3 + kids / 2 = 36 & man + woman + kids = 36 & kids % 2 = 0) System.out.println(man= + man + ,woman= + woman + ,kids= + kids); 2.自定义一个字符串函数，其功能是随机产生一个由字母和数字组成的任意位数的字符串。import java.util.*;public class test public static void main(String args) Random random = new Random(); int n = random.nextInt(100); StringBuffer sb = new StringBuffer(); for (int i = 0; i = n; i+) int c = random.nextInt(255); if ( (c = 0) | (c = A) | (c = a) sb.append( (char) c); i+; System.out.println(sb.toString(); -（中创七套）1.编写一个应用程序，创建三个线程分别显示各自的时间（在控制台打印时间即可）1、import java.util.Date;import java.text.SimpleDateFormat; public class ThreeTimeThread extends Threadpublic ThreeTimeThread(String str)super(str);public void run()while(true)SimpleDateFormat formatter = new SimpleDateFormat(yyyy.MM.dd hh:mm:ss);trythis.sleep(1000);catch(Exception e)e.printStackTrace();System.out.println (Thread.currentThread().getName()+：+formatter.format(new Date();public static void main(String arg) new ThreeTimeThread(first).start(); new ThreeTimeThread(second).start(); new ThreeTimeThread(third).start(); 2.有两个数int a, int b,中途不要添加任何参数,将a,b值互相交换.(完整的JAVA代码)仅提供一个方法public class testprivate int a;private int b;/* gettor or setter for properties a,b*/public int getA()return this.a;public int getB()return this.b;public void setA(int insa)this.a = insa;public void setB(int insb)tihs.b= insb/*交换a,b*/public void change()a = a + b;b = a - b;a = a - b;public static void main(String args)test t = new test();t.setA(10);t.setB(20);t.change();-（中创六套）1.编写一个截取字符串的函数，输入为一个字符串和字节数，输出为按字节截取的字符串。但是要保证汉字不被截半个，如“我ABC”4，应该截为“我AB”，输入“我ABC汉DEF”，6，应该输出为“我ABC”而不是“我ABC+汉的半个”。1) public class TestSplitString private String str;private int byteNum;public TestSplitString(String str, int byteNum) this.str = str;this.byteNum = byteNum;/截取字符串的函数（只要写出这个函数就可以）public void splitString() byte bt = str.getBytes();System.out.println(Length of this String = + bt.length);if (byteNum 1) if (btbyteNum 0) String substrx = new String(bt, 0, -byteNum);System.out.println(substrx); else String substrex = new String(bt, 0, byteNum);System.out.println(substrex); else if (byteNum = 1) if (btbyteNum 0) String substr1 = new String(bt, 0, +byteNum);System.out.println(substr1); else String subStr2 = new String(bt, 0, byteNum);System.out.println(subStr2); else System.out.println(输入错误！请输入大于零的整数：);/程序内测试方法public static void main(String args) TestSplitString tss = new TestSplitString(David大卫David, 8);tss.splitString();2、用输入/输出写一个程序，让用户输入一些姓名和电话号码。每一个姓名和号码将加在文件F1.TXT里。用户输入done来告诉系统整个列表已输入完毕。如果用户输入完整个列表，程序将创建一个输出文件并显示或打印出来。格式如： Tom 123-456-7890,Peggy 234-5678,Marc 234-5678, Ron 876-4321,Beth&Brian 33.1.42.45.70public class Test3 public static void main(String args) throws IOException String name, phoneNumber;BufferedReader reader1 =new BufferedReader(new InputStreamReader(System.in);FileWriter file = new FileWriter(E:/F1.txt);while (true) System.out.println(Please input Name:);name = reader1.readLine();if (!name.equals(done) file.write(name);file.write( ); elsebreak;System.out.println(Please input PhoneNumber:);phoneNumber = reader1.readLine();if (!phoneNumber.equals(done) file.write(phoneNumber);file.write(,); elsebreak;-（中创五套）（1） 写出至少一种Singleton（单态类）出来.(完整的JAVA代码饿汉式单态类public class Singletonprivate static final Singleton singleton = new Singleton();private Singleton() public static EagerSingleton getInstance() return singleton;懒汉式单态类public class LazySingleton private static LazySingleton m_instance = null;private LazySingleton() public static LazySingleton getInstance()if (m_instance = null)synchronized(LazySingleton.class)if (m_instance = null)m_instance = new LazySingleton();return m_instance;（2） 有个楼梯,长度为length,有人下楼,一次走一步或者一次走两步,问有多少种方法,用具体的方法实现.(完整的JAVA代码).主要用到递归public class testprivate int length;private int method=0;public void setLength(int l)this.length = l;public int getLength()return this.length;public int getM(int len)if(len=1)method=method+1;return method;if(len=2)method=method+2;return method;elsereturn getM(len-1)+getM(len-2);return method;public static void main(String args)test t = new test();t.setLength(100);System.out.println(100层总共的方法:+t.getM(t.getLength();-（中创四套）1、 有一组数字（3，10，6，8，98，22），编程（升降序皆可）输出排序后的结果。public class Test1 int a = 3,10,6,8,98,22;public Test1() /构造方法：无返回值 void( )public void sortArray() for (int i = 0;i 6;i +) for (int j = i+1;j 6 ;j + ) if (ai aj) int temp = 0; temp = ai; ai = aj; aj = temp; public void printArray() for (int i = 0;i 6; i +) System.out.println(ai + );public static void main(String args) Test1 test1 = new Test1();test1.sortArray();test1.printArray();2、 计算 1/1+1/2+1/3+.+1/100 的值。public class Test2 public double result;public Test2() result = 0.0;public double getResult() for (int i = 1;i = 100; i +) result += 1.0/i;return result;public static void main(String agrs) Test2 test2 = new Test2();System.out.println(test2.getResult();3、 从标准输入(即键盘)读入10个整数存入整型数组a中，然后逆序输出这10个整数。import java.io.*;public class Test3 int a = new int10; /给定一个空间public Test3() /构造方法 public void putIn() /声明一个方法BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in);for (int i = 0;i = 0;i -) System.out.print(ai + );public static void main(String agrs) Test3 test3 = new Test3();test3.putIn();test3.putOut();-（中创三套）与（中创八套）重题-（中创二套）(1)、(15)请编写程序打印下列图案： 1、public class Test01 public static void main(String args) int i, j, t, c;j = 1;t = 9;c = 5;while(c 0)for(i = 0; i = j; i+)System.out.print( );j+;for(i = 0; i t; i+)System.out.print(*);t -= 2;System.out.println();c-;（2）、(25)Java异常处理机制测试继承Exception类编写一个自定义异常类MyException,在自定义异常类中加入一个方法getMyMessage(),此方法无参数,返回值为一个字符串,字符串内容为你的自定义异常信息:你的姓名: + Exception的getMessage()方法的返回值.格式如: （姓名:*Exception*）。编写一个类ExceptionMaker,在里面定义一个方法throwException(),在这个方法中制造一种异常情况,抛出一个JDK自带的异常,捕捉这个异常,并在catch处理语句中抛出你的自定义异常MyException,抛出的自定义异常要求保留原异常的信息(getMessage()的返回值);再编写一个类MyExceptionTestCase,测试你编写的前面两个类,调用第二个类中的抛出你自定义异常的方法throwException(),捕捉你的自定义异常,并输出你自定义的异常信息.2、/* * 自定义的异常类 */class MyException extends Exception private String str;/* * 抛出异常 *return 抛出异常串 */public String getMyMessage() return str;/* * 构造自定义异常 *param 发生的异常 */public MyException(Exception e) Exception excep = new Exception(e);str = zhanggenbo + excep.getMessage();/* * 自定义的异常类 */class ExceptionMaker /* * 扑获异常 */public void throwException() throws ArithmeticException, MyException try int i = 3 / 0; catch (ArithmeticException e) System.out.println(e.getMessage();throw new MyException