java嵌套循环语法描述

/**
 * 
 * @author qsl
 *
 */
public class ChengFaB {
    public static void main(String[] args) {
        DD();
    }

    public static void FF() {//for...for
        for (int i = 1; i < 10; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + "*" + i + "=" + i * j + "    ");
            }
            System.out.println();
        }
    }

    public static void FW() {//for...while
        for (int i = 1; i < 10; i++) {
            int j = 1;
            while ( j <= i) {
                System.out.print(j + "*" + i + "=" + i * j + "    ");
                j++;
            }
            System.out.println();
        }
    }

    public static void WW() {//while...while
        int i = 1;
        while ( i < 10 ) {
            int j = 1;
            while ( j <= i) {
                System.out.print(j + "*" + i + "=" + i * j + "    ");
                j++;
            }
            System.out.println();
            i++;
        }
    }
    
    public static void DW() {//do...while while
        int i = 1;
        do{
            int j = 1;
            while ( j <= i) {
                System.out.print(j + "*" + i + "=" + i * j + "    ");
                j++;
            }
            System.out.println();
            i++;
        }while ( i < 10 ) ;
    }

    public static void DD() {//do...while  do...while
        int i = 1;
        do{
            int j = 1;
            do{
                System.out.print(j + "*" + i + "=" + i * j + "    ");
                j++;
            }while ( j <= i) ;
            System.out.println();
            i++;
        }while ( i < 10 ) ;
    }
}