java 循环结构

/**
 * java 循环结构
 */
public class learn_7 {
    public static void main(String[] args) {
        //whlie
        int a = 10;
        while (a < 20) {
            System.out.println(a);
            a++;
        }
        System.out.println("\n");
        //do while
        int b = 10;
        do {
            System.out.println(b);
            b++;
        }while (b < 10);
        System.out.println("\n");
        //for
        for (int x = 10; x