Array after class job

1, randomly generate 10 numbers, and calculate and

Code:

Importjavax.swing.*; Public classsuijishu{ Public Static voidMain (string[] args) {String output= ""; intnum = 0; intN[] =New int[10];  for(inti = 0;i < n.length;i++) {N[i]= (int) (Math.random () *100+1);//generate random numbers from 1 to 100} output+ = "subscript\tvalue\n";  for(inti = 0;i < n.length;i++) {Output+ = i + "\ T" + n[i] + "\ n"; Num+=N[i]; } JTextArea Outputarea=NewJTextArea (11,10);                Outputarea.settext (output); Joptionpane.showmessagedialog (NULL, Outputarea, "Initializing an Suijishu with a Declaration", Joptionpane.information_message); Joptionpane.showmessagedialog (NULL, num, "and of all elements in the array:", Joptionpane.information_message); System.exit (0); }}

Program Flowchart:

Results:

Programming Ideas:

Define an empty array first, then use the Main.random method to generate a random number, insert the number into the string object with a for loop, and finally the For loop calculation.

2, write a program to convert integers into Chinese characters reading method

Code:

 Public classnum2rmb{PrivateString[] Hanarr = {"0", "one", "II", "three", "the" ,        "WU", "Lu", "Qi", "ba", "JIU"}; PrivateString[] Unitarr = {"Ten", "Hundred", "thousand", "Million", "100,000", "Million"}; /*** Turn a four-bit numeric string into a kanji string *@paramNumstr a four-bit numeric string that needs to be converted *@returnA four-bit numeric string is converted into a character string. */  Privatestring Tohanstr (String numstr) {string result= ""; intNumlen =numstr.length (); //iterate through each digit of a numeric string in turn         for(inti = 0; i < Numlen; i++ )        {             //convert char numbers to int numbers because their ASCII values are exactly//so the char number minus 48 gets the int type number, for example ' 4 ' is converted to 4.              intnum = Numstr.charat (i)-48; //if it is not the last digit, and the number is not 0, you need to add units (thousand, Hundred, Ten)             if(I! = numLen-1 && num! = 0) {result+ = Hanarr[num] + unitarr[numlen-2-i]; }             //Otherwise, do not add units             Else             {                                     //whether the previous number is "0" and not "0" when added                   if(Result.length () >0 && hanarr[num].equals ("0") && Result.charat (Result.length ()-1) = = ' 0 ')                         Continue; Result+=Hanarr[num]; }        }        //only single digit, direct return        if(Result.length () ==1)             returnresult; intIndex=result.length ()-1;  while(Result.charat (index) = = ' 0 ') {Index--; }        if(Index!=result.length ()-1)             returnResult.substring (0,index+1); Else {             returnresult; }  }     Public Static voidMain (string[] args) {NUM2RMB nr=NewNUM2RMB (); System.out.println ("Only supports integers (0~ million)"); //test to turn a four-bit numeric string into a Chinese character stringSystem.out.println (Nr.tohanstr ("0")); System.out.println (Nr.tohanstr ("1")); System.out.println (Nr.tohanstr ("10")); System.out.println (Nr.tohanstr ("15")); System.out.println (Nr.tohanstr ("110")); System.out.println (Nr.tohanstr ("123")); System.out.println (Nr.tohanstr ("105")); System.out.println (Nr.tohanstr ("1000")); System.out.println (Nr.tohanstr ("1100")); System.out.println (Nr.tohanstr ("1110")); System.out.println (Nr.tohanstr ("1005")); System.out.println (Nr.tohanstr ("1105")); System.out.println (Nr.tohanstr ("1111")); System.out.println (Nr.tohanstr ("10000")); System.out.println (Nr.tohanstr ("10001")); System.out.println (Nr.tohanstr ("10011")); System.out.println (Nr.tohanstr ("10111")); System.out.println (Nr.tohanstr ("11111")); System.out.println (Nr.tohanstr ("11000")); System.out.println (Nr.tohanstr ("11100")); System.out.println (Nr.tohanstr ("11110")); System.out.println (Nr.tohanstr ("101110")); System.out.println (Nr.tohanstr ("1001110")); }}

Validation results:

3, read the program Whatdoesthisdo.java, explain the function completed by the program.

 Public classWHATDOESTHISDO {Static intResult//type int static variable  StaticString output;  Public Static voidMain (string[] args) {intA[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};//Initialize 10 numbersresult= Whatisthis (A, a.length);//Iterate callsOutput= "Result is:" +result;  SYSTEM.OUT.PRINTLN (output); }   Public Static intWhatisthis (intB[],intsize) {        if(Size = = 1)             returnB[0]; Else             returnB[SIZE-1] + whatisthis (b, size-1);//The iteration call implements the addition of the last number to the first number  }}

Verify:

4, read the program Whatdoesthisdo2.java, explain the function completed by the program.

Code:

 Public classWhatDoesThisDo2 { Public Static voidMain (string[] args) {intA[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};//Initialize 10 numbersStringBuilder Sbbuilder=NewStringBuilder ();//Create a StringBuilder objectSomeFunction (A,0, Sbbuilder);//Call function SomefunctionSystem.out.println (sbbuilder);//Output  }   Public Static voidSomeFunction (intB[],intx, StringBuilder out) {        if(X <b.length) {someFunction (b, x+ 1, out);//iterative call function for reverse inputout.append (B[x]+ "  ");//after each successive addition        }  }}

Verify:

Array after class job