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java£ºµÝ¹é£º10ԪǮ°´1£¬2£¬5ÔªÈÎÒâ×éºÏ

package game;
public class Money {
 public static void main(String[] args) {
  fun("", 10);
  System.out.println("×ܹ²Ëã·¨£º" + i);
 }
 // 10ԪǮµÄ×é³É£¬1£¬2£¬5ÈÎÒâ×éºÏ
 public static int i = 1;
 public static void fun(String log, int n) {
  // int num = n;
  if (0 == n) {
   System.out.println(log.substring(0, log.length() - 1) + "=");
   return;
  } else if (1 == n) {
   System.out.println(log + "1" + "=");
   return;
  }
  if (n >= 1)
   fun(log + "1+", n - 1);
  if (n >= 2)
   fun(log + "2+", n - 2);
  if (n >= 5)
   fun(log + "5+", n - 5);
  i++;
 }
}


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ÎÒÃÇÔÚ³¢ÏÊ JDK1.5 µÄʱºò£¬ÏàÐŲ»ÉÙÈËÓöµ½¹ý Unsupported major.minor version 49.0
´íÎ󣬵±Ê±¶¨»áãȻ²»ÖªËù´ë¡£ÒòΪ¸Õ¿ªÊ¼ÄÇ»á¶ù£¬ÍøÉÏÓë´ËÏà¹ØµÄÖÐÎÄ×ÊÁÏ»¹²»¶à£¬ÏÖÔÚºÃÁË£¬ÍøÉÏÒ»ÕÒ¾ÍÖªµÀÊÇÈçºÎ½â¾ö£¬´ó¶à»á¸æËßÄãҪʹÓà JDK
1.4 ÖØÐ±àÒë¡£ÄÇôÖÁÓÚΪʲô£ ......

java£ºdoubleÀàÐͽØÈ¡Á©Î»Ð¡Êý£¬²»È¡Éᣬ

public class Split{
 public static void main(String[] args){
       double pai = 3.14159;
        findTwo(pai);
  public static void findTwo(double value){
    System.out.println(new DecimalFormat("0.##"). ......

java£º¶þ·Ö²éÕÒ·¨

package arrays.compara;
/**
 *
 * @author Happy ¶þ·Ö²éÕÒ·¨
 */
public class BinarySearch {
 public static void main(String[] args) {
  int[] arrInt = { 2, 34, 32, 24, 23, 34, 12, 3, 4, 2 };
  int index = bSearch(29, arrInt, 0, arrInt.length);
 & ......

java£ºSetÑ­»·±éÀúµÄÁ©ÖÖ·½·¨Ê¹ÓÃ

package collection;
import java.util.*;
public class NewSet {
 public static void main(String[] args) {
  Set<Student> students = new HashSet<Student>();
  for (int i = 0; i < 6; i++) {
   students.add(new Student("Happy"+i,"male"+i,20+i)) ......
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