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1、1冒泡排序：Import java.util.Scanner;public class BubblePublic static void main(Stringargs)System.out.println(为m个数排序.);System.out.print(请输入m的值:);Scanner sca=new Scanner(System.in);int m=sca.nextInt();int i,j,tmp;inta=new intm;System.out.println(请输入m个数:);for(i=0;ia.length;i+)ai=sca.nextInt();System.out.pri
2、nt(排序前的数:);for(i=0;ia.length;i+)System.out.print(ai+ );System.out.println();for(i=0;ii;j-)if(aj-1aj)tmp=aj;aj=aj-1;aj-1=tmp;System.out.print(排序后的数:);for(i=0;ia.length;i+)System.out.print(ai+ );System.out.println();2完数public class Example2public static void main(String args) System.out.println(1到100的
3、完数有); for(int i=1; i100; i+) int t = 0; for(int j=1; j= i/2; j+) if(i % j = 0) t = t + j; if(t = i) System.out.print(i + ); 3回数import java.util.*;public class Example3 public static void main(String args) Scanner s = new Scanner(System.in); int a; do System.out.print(请输入一个5位正整数：); a = s.nextInt(); w
4、hile(a99999); String ss =String.valueOf(a); char ch = ss.toCharArray(); if(ch0=ch4&ch1=ch3) System.out.println(这是一个回文数); else System.out.println(这不是一个回文数); 4最大公约数import java.util.*;public class Example1 public static void main(String args) int a ,b,m;Scanner s = new Scanner(System.in);System.out.pri
5、nt( 键入一个整数： );a = s.nextInt();System.out.print( 再键入一个整数： );b = s.nextInt(); deff cd = new deff();m = cd.deff(a,b); int n = a * b / m;System.out.println(最大公约数: + m); System.out.println(最小公倍数: + n); class deff public int deff(int x, int y) int t; if(x y) t = x; x = y; y = t; while(y != 0) if(x = y) re
6、turn x; else int k = x % y; x = y; y = k; return x; 5求s=a+aa+aaa+aaaa+aa.a的值，其中a是一个数字。例如2+22+222+2222+22222(此时共有5个数相加)。几个数相加由键盘控制，从命令行输入。import java.util.*;public class Sum public static void main(String args) long a , b = 0, sum = 0; Scanner s = new Scanner(System.in); System.out.print(输入数字a的值： );
7、a = s.nextInt(); System.out.print(输入相加的项数：); int n = s.nextInt(); int i = 0; while(i n) b = b + a; sum = sum + b; a = a * 10; + i; System.out.println(项数为+n+和为：+sum);6古典问题（斐波拉契数列问题）：有一对兔子，从出生后第3个月起每个月都生一对兔子，小兔子长到第三个月后每个月又生了一对兔子，假如兔子都不死，问每个月的兔子总数为多少？public class rabbit public static void main(String a
8、rgs) System.out.println(第1个月的兔子对数: 1);System.out.println(第2个月的兔子对数: 1); int f1 = 1, f2 = 1, f, M=12; for(int i=3; i=M; i+) f = f2;f2 = f1 + f2; f1 = f;System.out.println(第 + i +个月的兔子对数: +f2); 7有一分数序列：2/1， 3/2 ，5/3 ，8/5 ，13/8 ，21/13.求出这个序列前20项之和。public class xulie public static void main(String args)
9、 int x = 2, y = 1, t; double sum = 0; for(int i=1; i=20; i+) sum = sum + (double)x / y; t = y; y = x; x = y + t; System.out.println(前20项相加之和是： + sum); 8字符串yekmaakkccekymbvb,求出字符串中有多少种字符,以及每个字符的个数?public class CountCharNum private int num; /统计字符种类变量 public CountCharNum(String str) this.num = str.leng
10、th(); public int count(String str) int leng = str.length(); if(leng = 0) return num; else String a = str.substring(0, 1); int charNum = 1; /统计字符个数变量 System.out.print(字符：+a); for (int i = 1; i str.length(); i+) if(a.equals(str.substring(i, i+1) num-; charNum+; System.out.println( +charNum); str = str
11、.replace(a, ); count(str); /用递归 return num; public static void main(String args) String aString = yekmaakkccekymbvbsf4w;CountCharNum cc = new CountCharNum(aString); System.out.println(共有字符类型:+cc.count(aString); 9以下程序的界面有一个按钮button、一个文本区textA和一个文本框textF。程序运行时，在文本区中输入数字序列，单击按钮，则在文本框中显示数字序列的和。将一个给定字符串反
12、过来输出。import java.awt.FlowLayout;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import javax.swing.JFrame;import javax.swing.JTextArea;import javax.swing.JButton;import javax.swing.JLabel;class Text_3 JButton button1=new JButton();JButton button2=new JButton();JButton button3=
13、new JButton();JTextArea textArea1=new JTextArea(1,10);JTextArea textArea2=new JTextArea(1,10);JTextArea textArea3=new JTextArea(1,10);JFrame jf=new JFrame();public void Buld() button1.setText(+); button2.setText(=); button3.setText(确认); button3.addActionListener(new ActionListener() public void acti
14、onPerformed(ActionEvent e) int first=Integer.parseInt(textArea1.getText();int second=Integer.parseInt(textArea2.getText();int result=first+second;textArea3.setText(Integer.toString(result););Text_3() Buld();jf.setLayout(new FlowLayout();jf.add(textArea1);jf.add(button1);jf.add(textArea2);jf.add(butt
15、on2);jf.add(textArea3);jf.add(button3);jf.pack();jf.setVisible(true);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); public static void main(String args) new Text_3(); 10计算两个日期相隔天数import java.util.*; public class MyDate int day; int month; int year; public MyDate() public MyDate(int day,int month
16、,int year) this.day = day; this.month = month; this.year = year; public void funtion(MyDate d) int newDay = d.day; int newMonth = d.month; int newYear = d.year; Calendar c1 = Calendar.getInstance(); c1.set(newYear,newMonth,newDay); long n1 = c1.getTimeInMillis(); Calendar c2 = Calendar.getInstance(); c2.set(year,month,day); long n2 = c2.getTimeInMillis(); System.out.println( 相差天数为: + Math.abs(n1 - n2)/24/3600000); public static void main(String args) MyDate d1 = new MyDate(1,1,2008); MyDate d2 = new MyDate(2,1,2001); d1.funtion(d2);