简单代码_循环_20160910

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package Chapter04;public class chapter04_example01 {    public static void main(String[] args) {        //第四章 循环        //cyclemethods();        primeNumber();    }    public static void cyclemethods(){        //        int number1 = 10, sum1 = 0, sum2 = 0;        while (number1 >= 0) {            sum1 += number1;            number1--;        }        System.out.println("sum1 = " + sum1);        number1 = 0;        do {            sum2 += number1;            System.out.print(number1 + "\t");            number1++;        } while (number1 <= 10);        System.out.println("\nsum2 = " + sum2);    }    public static void primeNumber(){        final int numberofprime = 50;        final int numberofpreline = 10;        int count = 0, number1 = 2;        System.out.println("the 50 primes is :");        while (count < numberofprime){            boolean isprime = true;            for(int testprime = 2; testprime <= number1/2; testprime++){                if(number1%testprime==0){                    isprime = false;                    break;                }//if            }//for            if (isprime) {                count++;                if (count % numberofpreline == 0)                    System.out.println(number1);// 换行                else                    System.out.print(number1 + " ");// 无需换行            }            number1++;        }//while    }}
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