java while loop example

Public classT8 { Public Static voidMain (string[] args) {//Upper Part for(intm = 1; M ) { //Output Spaces for(intn = 9; n >= m; n--) {System.out.print (" "); } //Output * Upper left for(intn = 1; n ) {System.out.print ("*"); } //Top Right for(intn = 1; n ) {System.out.print ("*"); } System.out.println (); } //Lower Half for(intm = 1; M ) { //Output S

Package Javafirst;public class Homework {public static void main (string[] args) {System.out.println ("Output a diamond! "); for (int i = 0; I 　　Java loop output a diamond and factorial countdown

Java for Each loop array object traversal Grammar for (type Itr-var:iterableobj) statement-block Take a look at the enumeration group instances public class MainClass {public static void Main (string args[]) {int nums[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};for (int x:nums) {System.out.print (x + "");x = x * 10; No effect on Nums}System.out.println (); for (int x:nums)System.out.print (x + "");

Package collection; Import java. util .*; Public class newset {Public static void main (string [] ARGs ){Set For (INT I = 0; I Students. Add (new student ("happy" + I, "male" + I, 20 + I ));}Students. Add (new student ("happy0", "male0", 20 ));Print (students );Print2 (students );}// Loop traversal ①Public static void print (set System. Out. println ("total data:" + newlist. Size ());/* Student;For (INT I =

; } Else { returnfalse; } }Take the team head element　 Public void queuefront (int getfront) { if(isEmpty () = =false) { Getfront=queuelist[(front+1)%maxlen]; } Else { System.out.println ("Error:queue is Empty"); return ; } }Team Public void enQueue (int endata) { if(isfull ()

String interception to the list using the base transform file store may use Public voidDemo () {String str= "abcdefgfdsdgdgdgdh1f"; ListNewArraylist(); String streee= ""; intLen =str.length (); intSub = 3; if(len% Sub! = 0) { for(inti = 0; I ) {streee= Str.substring (i, i + 3); List.add (STREEE); } String TPM= Str.substring (Str.length ()-(len%sub), Str.length ()); List.add (TPM); } Else { for(inti = 0; I ) {streee= Str.substring (i, i + 3);

each row has been assigned.//The current value--the number of the column on the previous row + the first number on the left of the column on the previous line (see image)Arr[i][j]=arr[i-1][j]+arr[i-1][j-1]; } } //Print Output for(inti = 0; i ) { for(intj = 0; J ) {System.out.print (Arr[i][j]+ "\ T");　　No Line break} System.out.println (); Line Change}}}Operation Result:1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 5 1

In general, access to data in List,array,set is accessed in the following wayint [] Nums = {1, 2, 3, 4, 5, 6, 7, 8, 9, ten }; for (int i = 0; i ) { System.out.println ("i =" + i);}Since Java1.5, there has been a more convenient way to access: foreachint [] Nums = {1, 2, 3, 4, 5, 6, 7, 8, 9, ten }; for (int x:nums) { System.out.println ("Value is:" + x); + = x;} Grammar: For (type variable name: Collection variable name) {statements;} Precautions

Package four ; Public classFouroneone { Public Static voidMain (String args[]) { for(intI=1; i7; i+=2){ for(intkong=7; kong>i-1; kong--) {System. out. Print (" "); } for(intxing=1; xing) {System. out. Print ("* "); } System. out. println (); } for(intj=1; j5; j+=2){ for(intkong1=1; kong13; kong1++) {System. out. Print (" "); } for(intxing1=5; xing1>=j;xing1--) {System. out. Print ("* "); } System. out. println (); } }}The 4th cha

Package four;public class Fouronetwo {public static void Main (String args[]) {Double sum = 0,a = 1;int i = 1;while (I {sum = sum+a;i = i+1;A = A * (1.0/i);}SYSTEM.OUT.PRINTLN (sum);}}Explanation: When I=1, Sum=1, i=2, a=1* (1/2);When i=2, SUM=1+1*1/2, I=3, a=1*1/2* (1/3);When I=3, SUM=1+1*1/2+1*1/2*1/3, i=4, a=1*1/2*1/3* (1/4) ...When I=20, SUM=1+1*1/2+1*1/2*1/3+...+1*1/2*...*1/20, i=21, a=1*1/2*...* (1/21)When I=21 is not establishedThe 4th chapter writes the

array: The subscript value cannot be easily accessed. Collection: It is not easy to delete things in the collection compared to using Interator. inside is also called InteratoIn addition to simply traversing and reading out the contents, it is not recommended to use the enhanced for. "Program Analysis"int[] arr = {1,2,3,4,5};for (int i:arr) {System.out.println (i); }Collection C = new ArrayList ();C.add (New String ("AA"));C.add (New String ("BB"));For (Object o:c) {System.out.println (o); }

Yi Shi Heavy(1) The output results are as follows:11 21 2 31 2 3 41 2 3) 4 51 2 3 4 5 61 2 3 4 5 6 71 2 3 4 5 6 7 81 2 3 4 5 6 7 8 9 Public class Test { publicstaticvoid main (string[] args) { int i,j,; for (i = 1;i ) { for (j = 1;j i;j++) { System.out.print (j); } System.out.println (); }}}(2) The output results are as follows:9 8 7 6 5 4 3 2 18 7 6 5 4 3 2 17 6 5 4 3 2 16 5 4 3 2 15 4 3) 2 14 3 2 13 2 12 11(3)1 2 3 4 5 61

Tag: the base port exti new Int () defines the ring stringhttp://www.verejava.com/?id=16992623980921/* do{ }while(判断表达式) ： 直到 while 判断表达式为 false 退出循环*/import java.util.Scanner;public class Test1 { /** * @param args the command line arguments */ public static void main(String[] args) { // 模拟切水果游戏, 键盘输入 1:西瓜,2:香蕉,3:水蜜桃,-1:雷 //输入数字打印对应的水果, 如果输入-1 终止游戏输入 Scanner in=new Scanner(System.in); int num=0; //定义了一个变量 do { num=in.n

public void Remove () {listHow to delete elements in a collection in a Java loop

= new file (FilePath);BufferedReader BufferedReader = new BufferedReader (new InputStreamReader (new FileInputStream (file), "Utf-8"));String line = null;while (line = Bufferedreader.readline ()) = null) {line = Line.trim ();Buffer.append (line);}Bufferedreader.close (); Return Removenotes (Buffer.tostring ());} /*** Remove Comments** @date 3:38:10* @author Duchaowei* @descripte* @param str* @return*/private string Removenotes (String str) {int start = Str.indexof ("//#");int end = Str.indexof

There are three main types of program running in Java:1, sequential structure: Sequential structure is the execution of each line of code sequentially2, branching structure: branch structure is branching according to different conditions3, loop structure: A piece of code is executed according to the conditions of the loop.Of these, there are two main types of branching structures:If...else ... Structure and

Java Design Polling thread performance issues with while loopThe polling thread is widely used in the development process, where I simulate a scenario that has a queue and polling thread, the main thread queues messages into the queue, and the polling thread loops through the queue to read the message and print the message content. A bit like handler in Android sends messages. First define a message class.public class Message { private String conte

forStatement Calculation1~100the sum of the odd numbers between. Import Java.util.scanner;public class Text4 {public static void Main (string[] args) { Scanner sc=new Scanner ( system.in); int i,sum=0; for (i=0;i5.Calculation2+22+222+2222+22222+.........+nthe sum. Import Java.util.scanner;public class Text5 {public static void main (string[] args) { Scanner sc=new Scanner (System. in); int n,i,j=0,sum=0; N=sc.nextint (); for (i=1;i6.public class Text6 {public static void mai

: Console input age, according to age output different tipsScanner sc=new Scanner (system.in);System.out.println ("Please enter an Age:");int Age=sc.nextint ();if (age>60){System.out.println ("You are old");}else if (age>30){System.out.println ("You are middle-aged");}else if (age>18){System.out.println ("You for Youth");}else if (age>13){System.out.println ("You are a teenager");}Else{System.out.println ("You Are Children");} Topic Seven: Enter the radius of the circle, calculate and outp

$ = array$.length, i$ = 0; i${int i = array$[i$];{System.out.println(i);}}List list = new ArrayList();list.add(1);list.add(2);list.add(3);for(java.util.Iterator i$ = list.iterator(); i$.hasNext();){String s = (String) i$.next();{System.out.println(s);}} It is clear that:1. For arrays, the Foreach loop actually uses the normal for loop2. For collections, the Foreach loop is actually an iterative iter