JAVA while loop, Do-while Loop, for loop

One, while loop

Instance:

 Public class test{    publicstaticvoid  main (string[] args) {        int i    =    1;          while (i<30) {            System.out.println (i);            I+ +;     }}}

Second, Do-while cycle

 Public class test{    publicstaticvoid  main (string[] args) {        int i    =    1;          Do {            System.out.println (i);            I++        ;        }  while (i<30);         // Do-while Loop, first executed once, and then in judgment, if the condition is set, in the loop execution, if not set, continue down execution     }}

Do-while instance (guess number game):

ImportJava.util.*; Public classtest{ Public Static voidMain (string[] args) {Scanner in=NewScanner (system.in); Random RA=NewRandom (); intr = Ra.nextint (10); intJ; System.out.println ("======= Guess number game =======");  Do{System.out.println ("Please enter the number to guess (0-9):"); intnum =In.nextint (); if(num<R) {System.out.println ("Very small."); J= 1; }            Else if(num>R) {System.out.println ("Great!"); J= 2; }            Else{System.out.println ("Guess right."); J= 11; }        }         while(j!=11); }}

Third, for Loop

 Public class test{    publicstaticvoid  main (string[] args) {        for ( int i=1;i<30;i++) {            System.out.println (i);     }}}

JAVA while loop, Do-while Loop, for loop