控制语句：Demo_Loop

 

package www.control;

/**
 * while    先判断后执行
 * do while 先执行后判断
 * for      初始化值/条件判断/迭代  9.for 快捷添加for循环
 *
 * 增强for    主要用来遍历数组或集合
 */

public class Demo4_Loop {
    public static void main(String[] args) {

        int i = 0;

        //println 输出自动换行
        //print 输出不换行
        //转义字符 "\n" 代表换行 "\t"代表tab键
        System.out.println("=while===========================");
        while (i<=10){
            System.out.print(i+" ");
            i++;
        }

        System.out.println("\n"+"=do while===========================");
        i=0;
        do {
            System.out.println(i);
            i++;
        }while (i<=10);

        System.out.println("=for===========================");
        for(int i1=1;i1<=100;i1++){
            if (i1%3==0){
                System.out.print(i1+"\t");
            }
            if (i1%(3*3)==0) {
                System.out.println();
            }
        }
        //死循环
        for (;;) {
        break;
        }

        //快捷方式添加for循环 9.for
        System.out.println("=九九表===========================");
        for (int i2 = 1; i2 <= 9; i2++) {
            for (int i3 = i2; i3 <= 9; i3++) {
                System.out.print(i2+"*"+i3+"="+i2*i3+"\t");
            }
            //System.out.print("\n");
            System.out.println();
        }

        System.out.println("=九九表===========================");
        for (int ib2 = 1; ib2 <= 9; ib2++) {
            for (int ib3 = 1; ib3 <= ib2; ib3++) {
                System.out.print(ib2+"*"+ib3+"="+ib2*ib3+"\t");
            }
            //System.out.print("\n");
            System.out.println();
        }
    }
}