for循环和Dowhile循环的应用

DoWhile循环

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

        int i = 0;
        int sum = 0;

        do {
            sum = sum + i;
            i++;
        } while (i <= 100);

        System.out.println(sum);
    }
}

{
        int a = 0;
        while (a<0){
            System.out.println(a);
            a++;
        }
        System.out.println("=======================");
        do {
            System.out.println(a);
            a++;
        }while (a<0);

    }
}

九九乘法表

{

        for (int j = 1; j <=9; j++) {
            for (int i = 1; i <=j; i++) {
            System.out.print(j+"*"+i+"="+ (j*i) +"\t");
            }
            System.out.println();

        }
    }


}	

for循环中的死循环

for(;;){
    内容
}

foe案例

package com.lol.LiOu.base;

public class ForDemo03 {
    public static void main(String[] args) {

        for (int i = 0; i <= 1000; i++) {
            if (i%5==0){
                System.out.print(i+"\t");
            }
            if (i%(5*3)==0){ //每行
                System.out.println();
                //System.out.print("\n");
            }
        }
    }
}

三角形

{
        for (int i = 1;i <= 5;i++) {
            for (int j = 5; j >= i; j--) {
                System.out.print(" ");
            }
            for (int j = 1; j <= i ; j++) {
                System.out.print("*");
            }
            for (int j = 1; j < i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}