java2经典问题.doc

1. 百鸡问题;/* * (#)baiji.java * * * author * version 1.00 2010/3/17 */public class baiji /* * Creates a new instance of baiji. */ public baiji() /* * param args the command line arguments */ public static void main(String args) / TODO code application logic here System.out.println( 百鸡问题); int x; int y; int z; for(x=1;x=100;x+) for(y=1;y=100;y+) for(z=1;z=100;z+) if(x+y+z=100)&(5*x+3*y+z/3.0=100) System.out.print(the number of cocks is+x+;); System.out.print(the number of hens is+y+;); System.out.print(the number of chicks is+z+.); System.out.println(); 2.求自然对数e;/* * (#)E.java 1.0 10/03/17 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.e;import java.awt.*;import java.awt.event.*;class E extends Frame public E() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) double e = 1.0; double t = 1.0; for (int i = 1; i 0; i-) e = (e + 1.0) / i; e+; System.out.println(e); */ 3.求圆周率pi;/* * (#)pi.java * * * author * version 1.00 2010/3/18 */public class pi /* * Creates a new instance of pi. */ public pi() /* * param args the command line arguments */ public static void main(String args) / TODO code application logic here double i; double s; double Pi; int sign=1; i=1; s=0; Pi=0; while (i=1000000) s=1/i; i=i + 2; s=s*sign; sign=(-1)*sign; Pi=Pi+s; Pi=Pi*4; System.out.println(Pi=+Pi); 4.输入字符串；/* * (#)app3_3.java * * * author * version 1.00 2010/3/18 */ /app3_3.javaimport java.io.*;public class app3_3 /* * Creates a new instance of app3_3. */ public app3_3() /* * param args the command line arguments */ public static void main(String args) throws IOException / TODO code application logic here BufferedReader buf; String str; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(请输入字符串：); str=buf.readLine(); System.out.println(您输入的字符串是：+str); 5. .教材P51页的逻辑运算符的练习;/* * (#)App3_6.java 1.0 02/07/25 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.app3_6;import java.awt.*;import java.awt.event.*;class App3_6 extends Frame public App3_6() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) System.out.println(Starting App3_6.);App3_6 mainFrame = new App3_6();mainFrame.setSize(400, 400);mainFrame.setTitle(App3_6);mainFrame.setVisible(true);int a=25,b=7;boolean x=ab;System.out.println(a5;System.out.println(xy=+(xy);if(e!=0&b5) System.out.println(a/f=+a/f);else System.out.println(f=+f);6.教材P61页if语句的运用;app4_1/* * (#)App4_1.java 1.0 02/07/25 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.app4_1;import java.awt.*;import java.awt.event.*;class App4_1 extends Frame public App4_1() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) System.out.println(Starting App4_1.);App4_1 mainFrame = new App4_1();mainFrame.setSize(400, 400);mainFrame.setTitle(App4_1);mainFrame.setVisible(true);int a=1,b=2,c=3,max,min;if(ab) max=a;else max=b;if(cmax)max=c;System.out.println(Max=+max);min=ab?a:b;min=cmin?c:min;System.out.println(Min=+min); 7.教材P66页求1+2+3+4.+n之和;/* * (#)App4_6.java 1.0 02/07/25 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.app4_6;import java.io.*;import java.awt.*;import java.awt.event.*;class App4_6 extends Frame public App4_6() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args)throws IOException System.out.println(Starting App4_6.);App4_6 mainFrame = new App4_6();mainFrame.setSize(400, 400);mainFrame.setTitle(App4_6);mainFrame.setVisible(true);int n,i=1,sum=0;String str;BufferedReader buf;buf=new BufferedReader(new InputStreamReader(System.in);doSystem.out.print(输入正整数：);str=buf.readLine();n=Integer.parseInt(str);while(n=0);while(i=n) sum+=i+; System.out.println(1+2+.+n+=+sum);8.教材P69页利用for循环求1+2+.10之和;/* * (#)App4_9.java 1.0 02/07/25 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.app4_9;import java.awt.*;import java.awt.event.*;class App4_9 extends Frame public App4_9() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) System.out.println(Starting App4_9.);App4_9 mainFrame = new App4_9();mainFrame.setSize(400, 400);mainFrame.setTitle(App4_9);mainFrame.setVisible(true);int i,n=10,s=0;for(i=1;i1;i-)s+=i;System.out.print(i+);System.out.println(i+=+(s+i);9.冒泡排序;/* * (#)Maopao.java 1.0 10/03/26 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.maopao;import java.awt.*;import java.awt.event.*;class Maopao extends Frame public Maopao() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) System.out.println(Starting Maopao.);Maopao mainFrame = new Maopao();mainFrame.setSize(400, 400);mainFrame.setTitle(Maopao);mainFrame.setVisible(true);int a=new int13, 69 ,52, 35 ,27, 9 ,15 ,56 ,32 ,17; int cont=0; System.out.print(从大到小：); for(int i=0;ia.length;i+) for(int j=0;ja.length-i-1;j+) if(ajaj+1) cont=aj; aj=aj+1; aj+1=cont; for(int i=0;ia.length;i+) System.out.print(ai+ ); 10.九九乘法表;/* * (#)jiujiu.java * * * author * version 1.00 2010/4/6 */public class jiujiu /* * Creates a new instance of jiujiu. */ public jiujiu() /* * param args the command line arguments */ public static void main(String args) / TODO code application logic here int m,n; System.out.println( 九九乘法表); for(m=1;m=9;m+) for(n=1;n=m;n+) System.out.print(n+*+m+=+(n*m)+ ); System.out.println(); 11.牛顿迭代法解一元高次方程;12.两个矩阵相乘的;/* * (#)juzhen.java * * * author * version 1.00 2010/3/25 */2个矩阵相乘public class juzhen static int a; static int b; /* * Creates a new instance of juzhen. */ public juzhen() /* * param args the command line arguments */ public static void main(String args) / TODO code application logic here int i,j,k,t; int a=3,-1,0,3,1,4,2,1; int b=1,-2,3,2,1,0; int x=a.length; int y=b0.length; int z=b.length; int r=new intxy; for(i=0;ix;i+) for(j=0;jy;j+) rij=0; for(k=0;kz;k+) rij+=aik*bkj; for(i=0;ir.length;i+) for(j=0;j edcba;/* * (#)reverse.java 1.0 09/07/06 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.reverse;import java.awt.*;import java.awt.event.*;import java.io.*;import java.lang.String;class reverse extends Frame public reverse() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args)throws IOException System.out.print(请输入字符串：); BufferedReader br = new BufferedReader(new InputStreamReader(System.in); String str = br.readLine(); char a = str.toCharArray(); System.out.print(字符串倒置的结果是：); for (int i = a.length - 1; i = 0; i-) System.out.print(ai+ ); System.out.println(); 14. 程序设计代码.doc-程序设计代码/* * (#)wenjian.java 1.0 09/07/06 * * You can modify the template of this file in the * directory .JCreatorTemplatesTemplate_1Project_Name.java * * You can also create your own project template by making a new * folder in the directory .JCreatorTemplate. Use the other * templates as examples. * */package myprojects.wenjian;import java.awt.*;import java.awt.event.*;import java.io.*;class wenjian extends Frame public wenjian() addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) dispose();System.exit(0););public static void main(String args) throws IOExceptionSystem.out.print(请输入文件全名：);BufferedReader br = new BufferedReader(new InputStreamReader(System.in); String str = br.readLine(); str=str.substring(0,str.lastIndexOf(.); System.out.println(文件名是：+str); 15.从键盘输入两个字符串,输入两个字符串的连接. 使用concat()方法;/* * (#)conwords.java * * * author * version 1.00 2010/4/14 */import java.io.*;public class conwords /* * Creates a new instance of conwords. */ public conwords() /* * param args the command line arguments */ public static void main(String args) throws IOException / TODO code application logic here String str1=; String str2=; String str3=; BufferedReader in1=ne