1 import java.util.LinkedList;
 2 
 3 import javax.swing.text.html.HTMLDocument.Iterator;
 4 
 5 //查表法转换进制
 6 public class jinZhi {
 7     public static void main(String  [] args){
 8         
 9         int num=6;
10         
11         tobin(num);
12         
13         toOct(num);
14         
15         toHex(num);
16     }
17     private static void toHex(int num) {
18         con(num,15,4);
19         
20     }
21 
22     private static void toOct(int num) {
23         con(num,7,3);
24         
25     }
26 
27     private static void tobin(int num) {
28         con(num,1,1);
29         
30     }
31 //列表法结合集合运用实例
32     private static void con(int num, int diwei, int yiwei) {
33         if(num==0){
34             System.out.println("num="+0);
35             return;
36         }
37         
38 //        表格法
39         char[] chs={‘0‘,‘1‘,‘2‘,‘3‘,‘4‘,‘5‘,‘6‘,‘7‘,
40                 ‘8‘,‘9‘,‘a‘,‘b‘,‘c‘,‘d‘,‘e‘,‘f‘};
41         
42         LinkedList<Character> list=new LinkedList<Character>();
43         
44         while(num!=0){
45         list.addFirst(chs[num&diwei]);
46         num>>>=yiwei;
47         }
48         while(!list.isEmpty()){
49             System.out.print(list.removeFirst());
50         }
51         System.out.println();
52     }
53 }

1 Integer.toHexString(int num);
2 10进制——16进制
3 Integer.toOctalString(int num);
4 10进制——8进制
5 Integer.toBinaryString(int num);
6 10进制——2进制

 1     public static int count(String str,String key){
 2         int count=0;
 3         int index=0;
 4         
 5         while( (index=str.indexOf(key,index))!=-1){
 6             index=index+key.length();
 7             count++;
 8         }
 9         return count;
10     }

 1 class ReverString{
 2     
 3     
 4     public static String reverseString(String s){
 5         return reverseString(s,0,s.length());
 6     }
 7 
 8     public static String reverseString(String s, int start, int end) {
 9 //        变字符数组
10         char[] ch=s.toCharArray();
11 //        将数组反转,已经得到ch的对象的反转字符数组
12         charRecerse(ch,start,end);
13         
14         return new String().valueOf(ch);
15     }
16 
17     public static void charRecerse(char[] ch, int start, int end) {
18         for(int x=start,y=end-1;x<y;x++,y--){
19             swap(ch,x,y);
20         }        
21     }
22     private static void swap(char[] ch,int x,int y){
23         char t=ch[x];
24         ch[x]=ch[y];
25         ch[y]=t;
26     }    
27 }

 1 /*
 2  * 需求：获取连个字符串中最大的相同子串
 3  */
 4     
 5     public static String getMaxSubString(String s1,String s2){
 6         String max,min;
 7         max=(s1.length()>s2.length())?s1:s2;
 8         min=(max==s1)?s2:s1;
 9         
10         for(int x=0;x<min.length();x++){
11             for(int y=0,z=min.length()-x;z<min.length()+1;y++,z++){
12                 String tenp=min.substring(y,z);
13                 if(max.contains(tenp)){
14                     return tenp;
15                 }
16             }            
17         }
18         return "没有字符串";
19         
20     }

 1 private static String StringSort(String s) {
 2 //        分割
 3         String[] str=s.split(" ");
 4 //        转成int型
 5         int[] arr=new int[str.length];
 6         for(int x=0;x<str.length;x++){
 7 //            使用Interger.parseInt方法将字符数组变Int数组
 8             arr[x]=Integer.parseInt(str[x]);
 9         }
10         Arrays.sort(arr);
11         
12         StringBuilder sb=new StringBuilder();
13         for(int x=0;x<arr.length;x++){
14             sb.append(arr[x]+"");
15         }
16         sb.append(arr[arr.length-1]+"");
17         
18         return sb.toString();
19     }

 1 import java.util.Arrays;
 2 //买票
 3 public class StringSort {
 4     
 5     public static void main(String[] args){
 6         Ticket tk = new Ticket();//建立票信息对象
 7         sealCentre tsc = new sealCentre(tk);// 创建售票中心。
 8         tsc.set(200);//售票中心分配一定数量的票                 
 9         new Thread(new windowsSeal(tk,"一号窗口")).start();// 创建、启动线程，开始卖票。
10         new Thread(new windowsSeal(tk,"二号窗口")).start();
11         new Thread(new windowsSeal(tk,"三号窗口")).start();
12         new Thread(new windowsSeal(tk,"四号窗口")).start();                        
13     }
14 
15 }    
16 
17 
18 class Ticket{
19     private int ticket;
20 
21     public int getTicket() {
22         return ticket;
23     }
24 
25     public void setTicket(int ticket) {
26         this.ticket = ticket;
27     }
28     
29     
30 }
31 
32 
33 class sealCentre{
34     private Ticket tk;
35     sealCentre(Ticket tk){
36         this.tk=tk;
37     }
38     public void set(int t){
39         tk.setTicket(t);
40     }    
41 }
42 
43 class windowsSeal implements Runnable{
44     private Ticket tk;
45     private String name;
46     windowsSeal(Ticket tk,String name){
47         this.tk=tk;
48         this.name=name;
49     }
50     @Override
51     public void run() {
52         
53         while(true){
54             synchronized (tk) {
55                 int t=tk.getTicket();
56                 if(t>0){
57                     System.out.println(name+"第"+(t--)+"张票卖出");
58                     tk.setTicket(t);
59                 }else{
60                     System.out.println(name+"票已经售完");
61 //                    System.exit(0);
62                     break;
63                 }
64             }    
65         }        
66     }    
67 }