java - for 循环15

package com.demo.test;

public class circulate {
    public static void main(String[] args) {
        System.out.println();
        f();
    }
    public static void f() {
        for (int i=0 ;i<4;i++){
            System.out.println("我跑！");
        }
    }
}

package com.demo.test;

public class circulate {
    public static void main(String[] args) {
        System.out.println();
        f(9);
    }

    public static void f(int q) {
        for (int i = 0; i < q; i++) {
            System.out.println("我跑！"+i);
        }
    }
}

package com.demo.test;

public class circulate {
    public static void main(String[] args) {
        int res = sum();
        System.out.println("1-100偶数的和为：" + res);
        narcissus();
        cir();
        cf();
    }

    public static int sum() {
        int sum = 0;
        for (int i = 1; i <= 100; i++) {
            if (i % 2 == 0) {
                sum += i;
            }
        }
        return sum;
    }

    //    水仙花案例
    public static void narcissus() {
        for (int i = 100; i <= 999; i++) {
            int individual = i % 10;
            int ten = i / 10 % 10;
            int hundred = i / 100 % 10;
            if (individual * individual * individual + ten * ten * ten + hundred * hundred * hundred == i) {
                System.out.println(i);
            }
        }
    }

    //这个思路也可以拿去做
    public static void cir() {
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
//    乘法表
    public static void cf() {
        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + "*" + i + "=" + j * i + "\t");
            }
            System.out.println();
        }
    }
}

 

 

 

　　和js的for循环没啥区别的，几个案例